diff --git a/README.md b/README.md
index 53728a7c1..8a8dac928 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ Terraform Provider for PagerDuty
 Requirements
 ------------
 
--	[Terraform](https://www.terraform.io/downloads.html) 0.10.x
+-	[Terraform](https://www.terraform.io/downloads.html) 0.12.x
 -	[Go](https://golang.org/doc/install) 1.11 (to build the provider plugin)
 
 Building The Provider
diff --git a/pagerduty/data_source_pagerduty_escalation_policy_test.go b/pagerduty/data_source_pagerduty_escalation_policy_test.go
index 0de48bd8b..476bdc7ec 100644
--- a/pagerduty/data_source_pagerduty_escalation_policy_test.go
+++ b/pagerduty/data_source_pagerduty_escalation_policy_test.go
@@ -69,13 +69,13 @@ resource "pagerduty_escalation_policy" "test" {
 
     target {
       type = "user_reference"
-      id   = "${pagerduty_user.test.id}"
+      id   = pagerduty_user.test.id
     }
   }
 }
 
 data "pagerduty_escalation_policy" "by_name" {
-  name = "${pagerduty_escalation_policy.test.name}"
+  name = pagerduty_escalation_policy.test.name
 }
 `, username, email, escalationPolicy)
 }
diff --git a/pagerduty/data_source_pagerduty_schedule_test.go b/pagerduty/data_source_pagerduty_schedule_test.go
index 835aaa7d3..5506fa97a 100644
--- a/pagerduty/data_source_pagerduty_schedule_test.go
+++ b/pagerduty/data_source_pagerduty_schedule_test.go
@@ -74,7 +74,7 @@ resource "pagerduty_schedule" "test" {
     start                        = "%s"
     rotation_virtual_start       = "%s"
     rotation_turn_length_seconds = 86400
-    users                        = ["${pagerduty_user.test.id}"]
+    users                        = [pagerduty_user.test.id]
 
     restriction {
       type              = "weekly_restriction"
@@ -86,7 +86,7 @@ resource "pagerduty_schedule" "test" {
 }
 
 data "pagerduty_schedule" "by_name" {
-  name = "${pagerduty_schedule.test.name}"
+  name = pagerduty_schedule.test.name
 }
 `, username, email, schedule, location, start, rotationVirtualStart)
 }
diff --git a/pagerduty/data_source_pagerduty_service_test.go b/pagerduty/data_source_pagerduty_service_test.go
index 8c2371294..3d2141f0d 100644
--- a/pagerduty/data_source_pagerduty_service_test.go
+++ b/pagerduty/data_source_pagerduty_service_test.go
@@ -68,7 +68,7 @@ resource "pagerduty_escalation_policy" "test" {
     escalation_delay_in_minutes = 10
     target {
       type = "user_reference"
-      id   = "${pagerduty_user.test.id}"
+      id   = pagerduty_user.test.id
     }
   }
 }
@@ -77,12 +77,12 @@ resource "pagerduty_service" "test" {
   name                    = "%s"
   auto_resolve_timeout    = 14400
   acknowledgement_timeout = 600
-  escalation_policy       = "${pagerduty_escalation_policy.test.id}"
+  escalation_policy       = pagerduty_escalation_policy.test.id
   alert_creation          = "create_incidents"
 }
 
 data "pagerduty_service" "by_name" {
-  name = "${pagerduty_service.test.name}"
+  name = pagerduty_service.test.name
 }
 `, username, email, service, escalationPolicy)
 }
diff --git a/pagerduty/data_source_pagerduty_team_test.go b/pagerduty/data_source_pagerduty_team_test.go
index 97981311c..6f784dabd 100644
--- a/pagerduty/data_source_pagerduty_team_test.go
+++ b/pagerduty/data_source_pagerduty_team_test.go
@@ -60,7 +60,7 @@ resource "pagerduty_team" "test" {
 }
 
 data "pagerduty_team" "by_name" {
-	name = "${pagerduty_team.test.name}"
+	name = pagerduty_team.test.name
 }
 `, name, description)
 }
diff --git a/pagerduty/data_source_pagerduty_user_test.go b/pagerduty/data_source_pagerduty_user_test.go
index 19d1a8c02..e6bc5221f 100644
--- a/pagerduty/data_source_pagerduty_user_test.go
+++ b/pagerduty/data_source_pagerduty_user_test.go
@@ -60,7 +60,7 @@ resource "pagerduty_user" "test" {
 }
 
 data "pagerduty_user" "by_email" {
-	email = "${pagerduty_user.test.email}"
+	email = pagerduty_user.test.email
 }
 `, username, email)
 }
diff --git a/pagerduty/resource_pagerduty_escalation_policy_test.go b/pagerduty/resource_pagerduty_escalation_policy_test.go
index 6109c1984..43a457f0b 100644
--- a/pagerduty/resource_pagerduty_escalation_policy_test.go
+++ b/pagerduty/resource_pagerduty_escalation_policy_test.go
@@ -215,7 +215,7 @@ resource "pagerduty_escalation_policy" "foo" {
 
     target {
       type = "user_reference"
-      id   = "${pagerduty_user.foo.id}"
+      id   = pagerduty_user.foo.id
     }
   }
 }
@@ -243,7 +243,7 @@ resource "pagerduty_escalation_policy" "foo" {
 
     target {
       type = "user_reference"
-      id   = "${pagerduty_user.foo.id}"
+      id   = pagerduty_user.foo.id
     }
   }
 
@@ -252,7 +252,7 @@ resource "pagerduty_escalation_policy" "foo" {
 
     target {
       type = "user_reference"
-      id   = "${pagerduty_user.foo.id}"
+      id   = pagerduty_user.foo.id
     }
   }
 }
@@ -279,14 +279,14 @@ resource "pagerduty_escalation_policy" "foo" {
   name        = "%s"
   description = "foo"
   num_loops   = 1
-	teams       = ["${pagerduty_team.foo.id}"]
+	teams       = [pagerduty_team.foo.id]
 
   rule {
     escalation_delay_in_minutes = 10
 
     target {
       type = "user_reference"
-      id   = "${pagerduty_user.foo.id}"
+      id   = pagerduty_user.foo.id
     }
   }
 }
@@ -319,7 +319,7 @@ resource "pagerduty_escalation_policy" "foo" {
 
     target {
       type = "user_reference"
-      id   = "${pagerduty_user.foo.id}"
+      id   = pagerduty_user.foo.id
     }
   }
 
@@ -328,7 +328,7 @@ resource "pagerduty_escalation_policy" "foo" {
 
     target {
       type = "user_reference"
-      id   = "${pagerduty_user.foo.id}"
+      id   = pagerduty_user.foo.id
     }
   }
 }
diff --git a/pagerduty/resource_pagerduty_extension_test.go b/pagerduty/resource_pagerduty_extension_test.go
index f58d3cf8f..a2d85ca06 100644
--- a/pagerduty/resource_pagerduty_extension_test.go
+++ b/pagerduty/resource_pagerduty_extension_test.go
@@ -154,7 +154,7 @@ resource "pagerduty_escalation_policy" "foo" {
 
     target {
       type = "user_reference"
-      id   = "${pagerduty_user.foo.id}"
+      id   = pagerduty_user.foo.id
     }
   }
 }
@@ -164,7 +164,7 @@ resource "pagerduty_service" "foo" {
   description             = "foo"
   auto_resolve_timeout    = 1800
   acknowledgement_timeout = 1800
-  escalation_policy       = "${pagerduty_escalation_policy.foo.id}"
+  escalation_policy       = pagerduty_escalation_policy.foo.id
 
   incident_urgency_rule {
     type    = "constant"
@@ -179,8 +179,8 @@ data "pagerduty_extension_schema" "foo" {
 resource "pagerduty_extension" "foo"{
   name = "%s"
   endpoint_url = "%s"
-  extension_schema = "${data.pagerduty_extension_schema.foo.id}"
-  extension_objects = ["${pagerduty_service.foo.id}"]
+  extension_schema = data.pagerduty_extension_schema.foo.id
+  extension_objects = [pagerduty_service.foo.id]
   config = <<EOF
 {
 	"restrict": "%[4]v",
diff --git a/pagerduty/resource_pagerduty_maintenance_window_test.go b/pagerduty/resource_pagerduty_maintenance_window_test.go
index f7591f7c6..4fb203816 100644
--- a/pagerduty/resource_pagerduty_maintenance_window_test.go
+++ b/pagerduty/resource_pagerduty_maintenance_window_test.go
@@ -132,7 +132,7 @@ resource "pagerduty_escalation_policy" "foo" {
 
     target {
       type = "user_reference"
-      id   = "${pagerduty_user.foo.id}"
+      id   = pagerduty_user.foo.id
     }
   }
 }
@@ -142,7 +142,7 @@ resource "pagerduty_service" "foo" {
   description             = "foo"
   auto_resolve_timeout    = 1800
   acknowledgement_timeout = 1800
-  escalation_policy       = "${pagerduty_escalation_policy.foo.id}"
+  escalation_policy       = pagerduty_escalation_policy.foo.id
 
   incident_urgency_rule {
     type    = "constant"
@@ -154,7 +154,7 @@ resource "pagerduty_maintenance_window" "foo" {
   description = "%[1]v"
   start_time  = "%[2]v"
   end_time    = "%[3]v"
-  services    = ["${pagerduty_service.foo.id}"]
+  services    = [pagerduty_service.foo.id]
 }
 `, desc, start, end)
 }
@@ -180,7 +180,7 @@ resource "pagerduty_escalation_policy" "foo" {
 
     target {
       type = "user_reference"
-      id   = "${pagerduty_user.foo.id}"
+      id   = pagerduty_user.foo.id
     }
   }
 }
@@ -190,7 +190,7 @@ resource "pagerduty_service" "foo" {
   description             = "foo"
   auto_resolve_timeout    = 1800
   acknowledgement_timeout = 1800
-  escalation_policy       = "${pagerduty_escalation_policy.foo.id}"
+  escalation_policy       = pagerduty_escalation_policy.foo.id
 
   incident_urgency_rule {
     type    = "constant"
@@ -203,7 +203,7 @@ resource "pagerduty_service" "foo2" {
   description             = "foo2"
   auto_resolve_timeout    = 1800
   acknowledgement_timeout = 1800
-  escalation_policy       = "${pagerduty_escalation_policy.foo.id}"
+  escalation_policy       = pagerduty_escalation_policy.foo.id
 
   incident_urgency_rule {
     type    = "constant"
@@ -215,7 +215,7 @@ resource "pagerduty_maintenance_window" "foo" {
   description = "%[1]v"
   start_time  = "%[2]v"
   end_time    = "%[3]v"
-  services    = ["${pagerduty_service.foo.id}", "${pagerduty_service.foo2.id}"]
+  services    = [pagerduty_service.foo.id, pagerduty_service.foo2.id]
 }
 `, desc, start, end)
 }
diff --git a/pagerduty/resource_pagerduty_schedule_test.go b/pagerduty/resource_pagerduty_schedule_test.go
index d9baaa107..f124c0618 100644
--- a/pagerduty/resource_pagerduty_schedule_test.go
+++ b/pagerduty/resource_pagerduty_schedule_test.go
@@ -342,7 +342,7 @@ resource "pagerduty_schedule" "foo" {
     start                        = "%s"
     rotation_virtual_start       = "%s"
     rotation_turn_length_seconds = 86400
-    users                        = ["${pagerduty_user.foo.id}"]
+    users                        = [pagerduty_user.foo.id]
 
     restriction {
       type              = "daily_restriction"
@@ -371,7 +371,7 @@ resource "pagerduty_schedule" "foo" {
     start                        = "%s"
     rotation_virtual_start       = "%s"
     rotation_turn_length_seconds = 86400
-    users                        = ["${pagerduty_user.foo.id}"]
+    users                        = [pagerduty_user.foo.id]
 
     restriction {
       type              = "daily_restriction"
@@ -400,7 +400,7 @@ resource "pagerduty_schedule" "foo" {
     start                        = "%s"
     rotation_virtual_start       = "%s"
     rotation_turn_length_seconds = 86400
-    users                        = ["${pagerduty_user.foo.id}"]
+    users                        = [pagerduty_user.foo.id]
 
     restriction {
       type              = "daily_restriction"
@@ -429,7 +429,7 @@ resource "pagerduty_schedule" "foo" {
     start                        = "%s"
     rotation_virtual_start       = "%s"
     rotation_turn_length_seconds = 86400
-    users                        = ["${pagerduty_user.foo.id}"]
+    users                        = [pagerduty_user.foo.id]
 
     restriction {
       type              = "daily_restriction"
@@ -459,7 +459,7 @@ resource "pagerduty_schedule" "foo" {
     start                        = "%s"
     rotation_virtual_start       = "%s"
     rotation_turn_length_seconds = 86400
-    users                        = ["${pagerduty_user.foo.id}"]
+    users                        = [pagerduty_user.foo.id]
 
     restriction {
       type              = "weekly_restriction"
@@ -489,7 +489,7 @@ resource "pagerduty_schedule" "foo" {
     start                        = "%s"
     rotation_virtual_start       = "%s"
     rotation_turn_length_seconds = 86400
-    users                        = ["${pagerduty_user.foo.id}"]
+    users                        = [pagerduty_user.foo.id]
 
 		restriction {
       type              = "weekly_restriction"
@@ -520,7 +520,7 @@ resource "pagerduty_schedule" "foo" {
     start                        = "%[5]v"
     rotation_virtual_start       = "%[6]v"
     rotation_turn_length_seconds = 86400
-    users                        = ["${pagerduty_user.foo.id}"]
+    users                        = [pagerduty_user.foo.id]
 
     restriction {
       type              = "daily_restriction"
@@ -534,7 +534,7 @@ resource "pagerduty_schedule" "foo" {
     start                        = "%[5]v"
     rotation_virtual_start       = "%[6]v"
     rotation_turn_length_seconds = 86400
-    users                        = ["${pagerduty_user.foo.id}"]
+    users                        = [pagerduty_user.foo.id]
 
     restriction {
       type              = "weekly_restriction"
@@ -549,7 +549,7 @@ resource "pagerduty_schedule" "foo" {
     start                        = "%[5]v"
     rotation_virtual_start       = "%[6]v"
     rotation_turn_length_seconds = 86400
-    users                        = ["${pagerduty_user.foo.id}"]
+    users                        = [pagerduty_user.foo.id]
 
     restriction {
       type              = "weekly_restriction"
diff --git a/pagerduty/resource_pagerduty_service_integration_test.go b/pagerduty/resource_pagerduty_service_integration_test.go
index dbcc8626f..a3b143e99 100644
--- a/pagerduty/resource_pagerduty_service_integration_test.go
+++ b/pagerduty/resource_pagerduty_service_integration_test.go
@@ -152,7 +152,7 @@ resource "pagerduty_escalation_policy" "foo" {
 
     target {
       type = "user_reference"
-      id   = "${pagerduty_user.foo.id}"
+      id   = pagerduty_user.foo.id
     }
   }
 }
@@ -162,7 +162,7 @@ resource "pagerduty_service" "foo" {
   description             = "foo"
   auto_resolve_timeout    = 1800
   acknowledgement_timeout = 1800
-  escalation_policy       = "${pagerduty_escalation_policy.foo.id}"
+  escalation_policy       = pagerduty_escalation_policy.foo.id
 
   incident_urgency_rule {
     type = "constant"
@@ -176,8 +176,8 @@ data "pagerduty_vendor" "datadog" {
 
 resource "pagerduty_service_integration" "foo" {
   name    = "%s"
-  service = "${pagerduty_service.foo.id}"
-  vendor  = "${data.pagerduty_vendor.datadog.id}"
+  service = pagerduty_service.foo.id
+  vendor  = data.pagerduty_vendor.datadog.id
 }
 `, username, email, escalationPolicy, service, serviceIntegration)
 }
@@ -203,7 +203,7 @@ resource "pagerduty_escalation_policy" "foo" {
 
     target {
       type = "user_reference"
-      id   = "${pagerduty_user.foo.id}"
+      id   = pagerduty_user.foo.id
     }
   }
 }
@@ -213,7 +213,7 @@ resource "pagerduty_service" "foo" {
   description             = "bar"
   auto_resolve_timeout    = 3600
   acknowledgement_timeout = 3600
-  escalation_policy       = "${pagerduty_escalation_policy.foo.id}"
+  escalation_policy       = pagerduty_escalation_policy.foo.id
 
   incident_urgency_rule {
     type    = "constant"
@@ -227,8 +227,8 @@ data "pagerduty_vendor" "datadog" {
 
 resource "pagerduty_service_integration" "foo" {
   name    = "%s"
-  service = "${pagerduty_service.foo.id}"
-  vendor  = "${data.pagerduty_vendor.datadog.id}"
+  service = pagerduty_service.foo.id
+  vendor  = data.pagerduty_vendor.datadog.id
 }
 `, username, email, escalationPolicy, service, serviceIntegration)
 }
@@ -250,7 +250,7 @@ resource "pagerduty_escalation_policy" "foo" {
 
     target {
       type = "user_reference"
-      id   = "${pagerduty_user.foo.id}"
+      id   = pagerduty_user.foo.id
     }
   }
 }
@@ -260,7 +260,7 @@ resource "pagerduty_service" "foo" {
   description             = "foo"
   auto_resolve_timeout    = 1800
   acknowledgement_timeout = 1800
-  escalation_policy       = "${pagerduty_escalation_policy.foo.id}"
+  escalation_policy       = pagerduty_escalation_policy.foo.id
 
   incident_urgency_rule {
     type = "constant"
@@ -270,7 +270,7 @@ resource "pagerduty_service" "foo" {
 
 resource "pagerduty_service_integration" "foo" {
   name    = "%s"
-  service = "${pagerduty_service.foo.id}"
+  service = pagerduty_service.foo.id
   type    = "generic_events_api_inbound_integration"
 }
 `, username, email, escalationPolicy, service, serviceIntegration)
@@ -297,7 +297,7 @@ resource "pagerduty_escalation_policy" "foo" {
 
     target {
       type = "user_reference"
-      id   = "${pagerduty_user.foo.id}"
+      id   = pagerduty_user.foo.id
     }
   }
 }
@@ -307,7 +307,7 @@ resource "pagerduty_service" "foo" {
   description             = "bar"
   auto_resolve_timeout    = 3600
   acknowledgement_timeout = 3600
-  escalation_policy       = "${pagerduty_escalation_policy.foo.id}"
+  escalation_policy       = pagerduty_escalation_policy.foo.id
 
   incident_urgency_rule {
     type    = "constant"
@@ -317,7 +317,7 @@ resource "pagerduty_service" "foo" {
 
 resource "pagerduty_service_integration" "foo" {
   name    = "%s"
-  service = "${pagerduty_service.foo.id}"
+  service = pagerduty_service.foo.id
   type    = "generic_events_api_inbound_integration"
 }
 `, username, email, escalationPolicy, service, serviceIntegration)
diff --git a/pagerduty/resource_pagerduty_service_test.go b/pagerduty/resource_pagerduty_service_test.go
index 4a13391b1..9037fa7c7 100644
--- a/pagerduty/resource_pagerduty_service_test.go
+++ b/pagerduty/resource_pagerduty_service_test.go
@@ -623,7 +623,7 @@ resource "pagerduty_escalation_policy" "foo" {
 		escalation_delay_in_minutes = 10
 		target {
 			type = "user_reference"
-			id   = "${pagerduty_user.foo.id}"
+			id   = pagerduty_user.foo.id
 		}
 	}
 }
@@ -633,7 +633,7 @@ resource "pagerduty_service" "foo" {
 	description             = "foo"
 	auto_resolve_timeout    = 1800
 	acknowledgement_timeout = 1800
-	escalation_policy       = "${pagerduty_escalation_policy.foo.id}"
+	escalation_policy       = pagerduty_escalation_policy.foo.id
 	alert_creation          = "create_incidents"
 }
 `, username, email, escalationPolicy, service)
@@ -658,7 +658,7 @@ resource "pagerduty_escalation_policy" "foo" {
 		escalation_delay_in_minutes = 10
 		target {
 			type = "user_reference"
-			id   = "${pagerduty_user.foo.id}"
+			id   = pagerduty_user.foo.id
 		}
 	}
 }
@@ -668,7 +668,7 @@ resource "pagerduty_service" "foo" {
 	description             = "foo"
 	auto_resolve_timeout    = 1800
 	acknowledgement_timeout = 1800
-	escalation_policy       = "${pagerduty_escalation_policy.foo.id}"
+	escalation_policy       = pagerduty_escalation_policy.foo.id
 	alert_creation          = "create_alerts_and_incidents"
 	alert_grouping          = "time"
 	alert_grouping_timeout  = 1800
@@ -695,7 +695,7 @@ resource "pagerduty_escalation_policy" "foo" {
 		escalation_delay_in_minutes = 10
 		target {
 			type = "user_reference"
-			id   = "${pagerduty_user.foo.id}"
+			id   = pagerduty_user.foo.id
 		}
 	}
 }
@@ -705,7 +705,7 @@ resource "pagerduty_service" "foo" {
 	description             = "foo"
 	auto_resolve_timeout    = 1800
 	acknowledgement_timeout = 1800
-	escalation_policy       = "${pagerduty_escalation_policy.foo.id}"
+	escalation_policy       = pagerduty_escalation_policy.foo.id
 	alert_creation          = "create_alerts_and_incidents"
 	alert_grouping          = "intelligent"
 	alert_grouping_timeout  = 1900
@@ -733,7 +733,7 @@ resource "pagerduty_escalation_policy" "foo" {
 		escalation_delay_in_minutes = 10
 		target {
 			type = "user_reference"
-			id   = "${pagerduty_user.foo.id}"
+			id   = pagerduty_user.foo.id
 		}
 	}
 }
@@ -744,7 +744,7 @@ resource "pagerduty_service" "foo" {
 	auto_resolve_timeout    = 3600
 	acknowledgement_timeout = 3600
 
-	escalation_policy       = "${pagerduty_escalation_policy.foo.id}"
+	escalation_policy       = pagerduty_escalation_policy.foo.id
 	incident_urgency_rule {
 		type    = "constant"
 		urgency = "high"
@@ -773,7 +773,7 @@ resource "pagerduty_escalation_policy" "foo" {
 		escalation_delay_in_minutes = 10
 		target {
 			type = "user_reference"
-			id   = "${pagerduty_user.foo.id}"
+			id   = pagerduty_user.foo.id
 		}
 	}
 }
@@ -784,7 +784,7 @@ resource "pagerduty_service" "foo" {
 	auto_resolve_timeout    = "null"
 	acknowledgement_timeout = "null"
 
-	escalation_policy       = "${pagerduty_escalation_policy.foo.id}"
+	escalation_policy       = pagerduty_escalation_policy.foo.id
 	incident_urgency_rule {
 		type    = "constant"
 		urgency = "high"
@@ -813,7 +813,7 @@ resource "pagerduty_escalation_policy" "foo" {
 		escalation_delay_in_minutes = 10
 		target {
 			type = "user_reference"
-			id   = "${pagerduty_user.foo.id}"
+			id   = pagerduty_user.foo.id
 		}
 	}
 }
@@ -823,7 +823,7 @@ resource "pagerduty_service" "foo" {
 	description             = "foo"
 	auto_resolve_timeout    = 1800
 	acknowledgement_timeout = 1800
-	escalation_policy       = "${pagerduty_escalation_policy.foo.id}"
+	escalation_policy       = pagerduty_escalation_policy.foo.id
 
 	incident_urgency_rule {
 		type = "use_support_hours"
@@ -878,7 +878,7 @@ resource "pagerduty_escalation_policy" "foo" {
 		escalation_delay_in_minutes = 10
 		target {
 			type = "user_reference"
-			id   = "${pagerduty_user.foo.id}"
+			id   = pagerduty_user.foo.id
 		}
 	}
 }
@@ -888,7 +888,7 @@ resource "pagerduty_service" "foo" {
 	description             = "foo"
 	auto_resolve_timeout    = 1800
 	acknowledgement_timeout = 1800
-	escalation_policy       = "${pagerduty_escalation_policy.foo.id}"
+	escalation_policy       = pagerduty_escalation_policy.foo.id
 
 	incident_urgency_rule {
 		type = "use_support_hours"
@@ -934,7 +934,7 @@ resource "pagerduty_escalation_policy" "foo" {
 		escalation_delay_in_minutes = 10
 		target {
 			type = "user_reference"
-			id   = "${pagerduty_user.foo.id}"
+			id   = pagerduty_user.foo.id
 		}
 	}
 }
@@ -944,7 +944,7 @@ resource "pagerduty_service" "foo" {
 	description             = "bar bar bar"
 	auto_resolve_timeout    = 3600
 	acknowledgement_timeout = 3600
-	escalation_policy       = "${pagerduty_escalation_policy.foo.id}"
+	escalation_policy       = pagerduty_escalation_policy.foo.id
 
 	incident_urgency_rule {
 		type = "use_support_hours"
@@ -998,7 +998,7 @@ resource "pagerduty_escalation_policy" "foo" {
 		escalation_delay_in_minutes = 10
 		target {
 			type = "user_reference"
-			id   = "${pagerduty_user.foo.id}"
+			id   = pagerduty_user.foo.id
 		}
 	}
 }
@@ -1008,7 +1008,7 @@ resource "pagerduty_service" "foo" {
 	description             = "foo"
 	auto_resolve_timeout    = 1800
 	acknowledgement_timeout = 1800
-	escalation_policy       = "${pagerduty_escalation_policy.foo.id}"
+	escalation_policy       = pagerduty_escalation_policy.foo.id
 
 	incident_urgency_rule {
 		type = "constant"
diff --git a/pagerduty/resource_pagerduty_team_membership_test.go b/pagerduty/resource_pagerduty_team_membership_test.go
index 81f11e3d3..4438fe27c 100644
--- a/pagerduty/resource_pagerduty_team_membership_test.go
+++ b/pagerduty/resource_pagerduty_team_membership_test.go
@@ -123,8 +123,8 @@ resource "pagerduty_team" "foo" {
 }
 
 resource "pagerduty_team_membership" "foo" {
-  user_id = "${pagerduty_user.foo.id}"
-  team_id = "${pagerduty_team.foo.id}"
+  user_id = pagerduty_user.foo.id
+  team_id = pagerduty_team.foo.id
 }
 `, user, team)
 }
@@ -142,8 +142,8 @@ resource "pagerduty_team" "foo" {
 }
 
 resource "pagerduty_team_membership" "foo" {
-  user_id = "${pagerduty_user.foo.id}"
-  team_id = "${pagerduty_team.foo.id}"
+  user_id = pagerduty_user.foo.id
+  team_id = pagerduty_team.foo.id
   role    = "%[3]v"
 }
 `, user, team, role)
diff --git a/pagerduty/resource_pagerduty_user_contact_method_test.go b/pagerduty/resource_pagerduty_user_contact_method_test.go
index 4916711af..dbe36fa23 100644
--- a/pagerduty/resource_pagerduty_user_contact_method_test.go
+++ b/pagerduty/resource_pagerduty_user_contact_method_test.go
@@ -144,7 +144,7 @@ resource "pagerduty_user" "foo" {
 }
 
 resource "pagerduty_user_contact_method" "foo" {
-  user_id = "${pagerduty_user.foo.id}"
+  user_id = pagerduty_user.foo.id
   type    = "email_contact_method"
   address = "%[1]v%[2]v"
   label   = "%[1]v"
@@ -164,7 +164,7 @@ resource "pagerduty_user" "foo" {
 }
 
 resource "pagerduty_user_contact_method" "foo" {
-  user_id = "${pagerduty_user.foo.id}"
+  user_id = pagerduty_user.foo.id
   type    = "email_contact_method"
   address = "%[1]v%[2]v"
   label   = "%[1]v"
@@ -184,7 +184,7 @@ resource "pagerduty_user" "foo" {
 }
 
 resource "pagerduty_user_contact_method" "foo" {
-  user_id      = "${pagerduty_user.foo.id}"
+  user_id      = pagerduty_user.foo.id
   type         = "phone_contact_method"
   country_code = "+1"
   address      = "%[3]s"
@@ -205,7 +205,7 @@ resource "pagerduty_user" "foo" {
 }
 
 resource "pagerduty_user_contact_method" "foo" {
-  user_id      = "${pagerduty_user.foo.id}"
+  user_id      = pagerduty_user.foo.id
   type         = "sms_contact_method"
   country_code = "+1"
   address      = "8448003889"
@@ -226,7 +226,7 @@ resource "pagerduty_user" "foo" {
 }
 
 resource "pagerduty_user_contact_method" "foo" {
-  user_id      = "${pagerduty_user.foo.id}"
+  user_id      = pagerduty_user.foo.id
   type         = "sms_contact_method"
   country_code = "+1"
   address      = "6509892965"
diff --git a/pagerduty/resource_pagerduty_user_notification_rule_test.go b/pagerduty/resource_pagerduty_user_notification_rule_test.go
index d8060bba6..d1fbee9c8 100644
--- a/pagerduty/resource_pagerduty_user_notification_rule_test.go
+++ b/pagerduty/resource_pagerduty_user_notification_rule_test.go
@@ -85,13 +85,13 @@ func testAccCheckPagerDutyUserNotificationRuleExists(n string) resource.TestChec
 func testAccCheckPagerDutyUserNotificationRuleContactMethodConfig(methodType string) string {
 	return fmt.Sprintf(`
 resource "pagerduty_user_notification_rule" "foo" {
-  user_id                = "${pagerduty_user.foo.id}"
+  user_id                = pagerduty_user.foo.id
   start_delay_in_minutes = 1
   urgency                = "high"
 
   contact_method = {
     type = "%[1]v"
-    id   = "${pagerduty_user_contact_method.%[1]v.id}"
+    id   = pagerduty_user_contact_method.%[1]v.id
   }
 }
 
@@ -105,14 +105,14 @@ resource "pagerduty_user" "foo" {
 }
 
 resource "pagerduty_user_contact_method" "email_contact_method" {
-  user_id = "${pagerduty_user.foo.id}"
+  user_id = pagerduty_user.foo.id
   type    = "email_contact_method"
   address = "foo-1@bar.com"
   label   = "Work"
 }
 
 resource "pagerduty_user_contact_method" "sms_contact_method" {
-  user_id      = "${pagerduty_user.foo.id}"
+  user_id      = pagerduty_user.foo.id
   type         = "sms_contact_method"
   address      = "8005551234"
   country_code = "+1"
@@ -120,7 +120,7 @@ resource "pagerduty_user_contact_method" "sms_contact_method" {
 }
 
 resource "pagerduty_user_contact_method" "phone_contact_method" {
-  user_id      = "${pagerduty_user.foo.id}"
+  user_id      = pagerduty_user.foo.id
   type         = "phone_contact_method"
   country_code = "+1"
   address      = "8005551234"
diff --git a/pagerduty/resource_pagerduty_user_test.go b/pagerduty/resource_pagerduty_user_test.go
index f1defd8ec..aaefe9309 100644
--- a/pagerduty/resource_pagerduty_user_test.go
+++ b/pagerduty/resource_pagerduty_user_test.go
@@ -228,8 +228,8 @@ resource "pagerduty_user" "foo" {
 }
 
 resource "pagerduty_team_membership" "foo" {
-  user_id = "${pagerduty_user.foo.id}"
-  team_id = "${pagerduty_team.foo.id}"
+  user_id = pagerduty_user.foo.id
+  team_id = pagerduty_team.foo.id
 }
 `, team, username, email)
 }
@@ -250,13 +250,13 @@ resource "pagerduty_user" "foo" {
 }
 
 resource "pagerduty_team_membership" "foo" {
-  user_id = "${pagerduty_user.foo.id}"
-  team_id = "${pagerduty_team.foo.id}"
+  user_id = pagerduty_user.foo.id
+  team_id = pagerduty_team.foo.id
 }
 
 resource "pagerduty_team_membership" "bar" {
-  user_id = "${pagerduty_user.foo.id}"
-  team_id = "${pagerduty_team.bar.id}"
+  user_id = pagerduty_user.foo.id
+  team_id = pagerduty_team.bar.id
 }
 `, team1, team2, username, email)
 }
diff --git a/website/docs/d/escalation_policy.html.markdown b/website/docs/d/escalation_policy.html.markdown
index 6b1d56c99..3a71a4d94 100644
--- a/website/docs/d/escalation_policy.html.markdown
+++ b/website/docs/d/escalation_policy.html.markdown
@@ -23,7 +23,7 @@ resource "pagerduty_service" "test" {
   name                    = "My Web App"
   auto_resolve_timeout    = 14400
   acknowledgement_timeout = 600
-  escalation_policy       = "${data.pagerduty_escalation_policy.test.id}"
+  escalation_policy       = data.pagerduty_escalation_policy.test.id
 }
 ```
 
diff --git a/website/docs/d/extension_schema.html.markdown b/website/docs/d/extension_schema.html.markdown
index 4eac44597..dc2f0f730 100644
--- a/website/docs/d/extension_schema.html.markdown
+++ b/website/docs/d/extension_schema.html.markdown
@@ -20,7 +20,7 @@ data "pagerduty_extension_schema" "webhook" {
 resource "pagerduty_user" "example" {
   name  = "Howard James"
   email = "howard.james@example.domain"
-  teams = ["${pagerduty_team.example.id}"]
+  teams = [pagerduty_team.example.id]
 }
 
 resource "pagerduty_escalation_policy" "foo" {
@@ -32,7 +32,7 @@ resource "pagerduty_escalation_policy" "foo" {
 
     target {
       type = "user"
-      id   = "${pagerduty_user.example.id}"
+      id   = pagerduty_user.example.id
     }
   }
 }
@@ -41,15 +41,15 @@ resource "pagerduty_service" "example" {
   name                    = "My Web App"
   auto_resolve_timeout    = 14400
   acknowledgement_timeout = 600
-  escalation_policy       = "${pagerduty_escalation_policy.example.id}"
+  escalation_policy       = pagerduty_escalation_policy.example.id
 }
 
 
 resource "pagerduty_extension" "slack"{
   name = "My Web App Extension"
   endpoint_url = "https://generic_webhook_url/XXXXXX/BBBBBB"
-  extension_schema = "${data.pagerduty_extension_schema.webhook.id}"
-  extension_objects    = ["${pagerduty_service.example.id}"]
+  extension_schema = data.pagerduty_extension_schema.webhook.id
+  extension_objects    = [pagerduty_service.example.id]
 }
 ```
 
diff --git a/website/docs/d/schedule.html.markdown b/website/docs/d/schedule.html.markdown
index 3efb2c7ef..9bfb1ff73 100644
--- a/website/docs/d/schedule.html.markdown
+++ b/website/docs/d/schedule.html.markdown
@@ -28,7 +28,7 @@ resource "pagerduty_escalation_policy" "foo" {
 
     target {
       type = "schedule"
-      id   = "${data.pagerduty_schedule.test.id}"
+      id   = data.pagerduty_schedule.test.id
     }
   }
 }
diff --git a/website/docs/d/team.html.markdown b/website/docs/d/team.html.markdown
index 667488d45..c42402bc7 100644
--- a/website/docs/d/team.html.markdown
+++ b/website/docs/d/team.html.markdown
@@ -25,14 +25,14 @@ resource "pagerduty_escalation_policy" "foo" {
   name      = "DevOps Escalation Policy"
   num_loops = 2
 
-  teams = ["${data.pagerduty_team.devops.id}"]
+  teams = [data.pagerduty_team.devops.id]
 
   rule {
     escalation_delay_in_minutes = 10
 
     target {
       type = "user"
-      id   = "${data.pagerduty_user.me.id}"
+      id   = data.pagerduty_user.me.id
     }
   }
 }
diff --git a/website/docs/d/user.html.markdown b/website/docs/d/user.html.markdown
index 59781787a..3b9bc15ac 100644
--- a/website/docs/d/user.html.markdown
+++ b/website/docs/d/user.html.markdown
@@ -26,7 +26,7 @@ resource "pagerduty_escalation_policy" "foo" {
 
     target {
       type = "user"
-      id   = "${data.pagerduty_user.me.id}"
+      id   = data.pagerduty_user.me.id
     }
   }
 }
diff --git a/website/docs/d/vendor.html.markdown b/website/docs/d/vendor.html.markdown
index 34e7c69cd..6cea10571 100644
--- a/website/docs/d/vendor.html.markdown
+++ b/website/docs/d/vendor.html.markdown
@@ -20,7 +20,7 @@ data "pagerduty_vendor" "datadog" {
 resource "pagerduty_user" "example" {
   name  = "Earline Greenholt"
   email = "125.greenholt.earline@graham.name"
-  teams = ["${pagerduty_team.example.id}"]
+  teams = [pagerduty_team.example.id]
 }
 
 resource "pagerduty_escalation_policy" "foo" {
@@ -32,7 +32,7 @@ resource "pagerduty_escalation_policy" "foo" {
 
     target {
       type = "user"
-      id   = "${pagerduty_user.example.id}"
+      id   = pagerduty_user.example.id
     }
   }
 }
@@ -41,13 +41,13 @@ resource "pagerduty_service" "example" {
   name                    = "My Web App"
   auto_resolve_timeout    = 14400
   acknowledgement_timeout = 600
-  escalation_policy       = "${pagerduty_escalation_policy.example.id}"
+  escalation_policy       = pagerduty_escalation_policy.example.id
 }
 
 resource "pagerduty_service_integration" "example" {
   name    = "Datadog Integration"
-  vendor  = "${data.pagerduty_vendor.datadog.id}"
-  service = "${pagerduty_service.example.id}"
+  vendor  = data.pagerduty_vendor.datadog.id
+  service = pagerduty_service.example.id
   type    = "generic_events_api_inbound_integration"
 }
 ```
diff --git a/website/docs/index.html.markdown b/website/docs/index.html.markdown
index 3ed1a1134..85c512114 100644
--- a/website/docs/index.html.markdown
+++ b/website/docs/index.html.markdown
@@ -17,7 +17,7 @@ Use the navigation to the left to read about the available resources.
 ```hcl
 # Configure the PagerDuty provider
 provider "pagerduty" {
-  token = "${var.pagerduty_token}"
+  token = var.pagerduty_token
 }
 
 # Create a PagerDuty team
@@ -30,7 +30,7 @@ resource "pagerduty_team" "engineering" {
 resource "pagerduty_user" "earline" {
   name  = "Earline Greenholt"
   email = "125.greenholt.earline@graham.name"
-  teams = ["${pagerduty_team.engineering.id}"]
+  teams = [pagerduty_team.engineering.id]
 }
 ```
 
diff --git a/website/docs/r/escalation_policy.html.markdown b/website/docs/r/escalation_policy.html.markdown
index 31c6093de..7d1470d72 100644
--- a/website/docs/r/escalation_policy.html.markdown
+++ b/website/docs/r/escalation_policy.html.markdown
@@ -22,20 +22,20 @@ resource "pagerduty_team" "example" {
 resource "pagerduty_user" "example" {
   name  = "Earline Greenholt"
   email = "125.greenholt.earline@graham.name"
-  teams = ["${pagerduty_team.example.id}"]
+  teams = [pagerduty_team.example.id]
 }
 
 resource "pagerduty_escalation_policy" "example" {
   name      = "Engineering Escalation Policy"
   num_loops = 2
-  teams     = ["${pagerduty_team.example.id}"]
+  teams     = [pagerduty_team.example.id]
 
   rule {
     escalation_delay_in_minutes = 10
 
     target {
       type = "user"
-      id   = "${pagerduty_user.example.id}"
+      id   = pagerduty_user.example.id
     }
   }
 }
diff --git a/website/docs/r/extension.html.markdown b/website/docs/r/extension.html.markdown
index b7197a690..9c869dd98 100644
--- a/website/docs/r/extension.html.markdown
+++ b/website/docs/r/extension.html.markdown
@@ -20,7 +20,7 @@ data "pagerduty_extension_schema" "webhook" {
 resource "pagerduty_user" "example" {
   name  = "Howard James"
   email = "howard.james@example.domain"
-  teams = ["${pagerduty_team.example.id}"]
+  teams = [pagerduty_team.example.id]
 }
 
 resource "pagerduty_escalation_policy" "foo" {
@@ -32,7 +32,7 @@ resource "pagerduty_escalation_policy" "foo" {
 
     target {
       type = "user"
-      id   = "${pagerduty_user.example.id}"
+      id   = pagerduty_user.example.id
     }
   }
 }
@@ -41,15 +41,15 @@ resource "pagerduty_service" "example" {
   name                    = "My Web App"
   auto_resolve_timeout    = 14400
   acknowledgement_timeout = 600
-  escalation_policy       = "${pagerduty_escalation_policy.example.id}"
+  escalation_policy       = pagerduty_escalation_policy.example.id
 }
 
 
 resource "pagerduty_extension" "slack"{
   name = "My Web App Extension"
   endpoint_url = "https://generic_webhook_url/XXXXXX/BBBBBB"
-  extension_schema = "${data.pagerduty_extension_schema.webhook.id}"
-  extension_objects    = ["${pagerduty_service.example.id}"]
+  extension_schema = data.pagerduty_extension_schema.webhook.id
+  extension_objects    = [pagerduty_service.example.id]
 
   config = <<EOF
 {
@@ -71,7 +71,7 @@ EOF
 The following arguments are supported:
 
   * `name` - (Optional) The name of the service extension.
-  * `endpoint_url` - (Required|Optional) The url of the extension.  
+  * `endpoint_url` - (Required|Optional) The url of the extension.
   **Note:** The [endpoint URL is Optional API wise](https://api-reference.pagerduty.com/#!/Extensions/post_extensions) in most cases. But in some cases it is a _Required_ parameter. For example, `pagerduty_extension_schema` named `Generic V2 Webhook` doesn't accept `pagerduty_extension` with no `endpoint_url`, but one with named `Slack` accepts.
   * `extension_schema` - (Required) This is the schema for this extension.
   * `extension_objects` - (Required) This is the objects for which the extension applies (An array of service ids).
@@ -92,4 +92,3 @@ Extensions can be imported using the id.e.g.
 ```
 $ terraform import pagerduty_extension.main PLBP09X
 ```
-
diff --git a/website/docs/r/maintenance_window.html.markdown b/website/docs/r/maintenance_window.html.markdown
index 363333194..09670eaa3 100644
--- a/website/docs/r/maintenance_window.html.markdown
+++ b/website/docs/r/maintenance_window.html.markdown
@@ -19,7 +19,7 @@ Maintenance windows are specified to start at a certain time and end after they
 resource "pagerduty_maintenance_window" "example" {
   start_time  = "2015-11-09T20:00:00-05:00"
   end_time    = "2015-11-09T22:00:00-05:00"
-  services    = ["${pagerduty_service.example.id}"]
+  services    = [pagerduty_service.example.id]
 }
 ```
 
diff --git a/website/docs/r/schedule.html.markdown b/website/docs/r/schedule.html.markdown
index 14edb374b..de03d1a3b 100644
--- a/website/docs/r/schedule.html.markdown
+++ b/website/docs/r/schedule.html.markdown
@@ -17,7 +17,7 @@ A [schedule](https://v2.developer.pagerduty.com/v2/page/api-reference#!/Schedule
 resource "pagerduty_user" "example" {
   name  = "Earline Greenholt"
   email = "125.greenholt.earline@graham.name"
-  teams = ["${pagerduty_team.example.id}"]
+  teams = [pagerduty_team.example.id]
 }
 
 resource "pagerduty_schedule" "foo" {
@@ -29,7 +29,7 @@ resource "pagerduty_schedule" "foo" {
     start                        = "2015-11-06T20:00:00-05:00"
     rotation_virtual_start       = "2015-11-06T20:00:00-05:00"
     rotation_turn_length_seconds = 86400
-    users                        = ["${pagerduty_user.foo.id}"]
+    users                        = [pagerduty_user.foo.id]
 
     restriction {
       type              = "daily_restriction"
diff --git a/website/docs/r/service.html.markdown b/website/docs/r/service.html.markdown
index 839293948..f4de9bdd0 100644
--- a/website/docs/r/service.html.markdown
+++ b/website/docs/r/service.html.markdown
@@ -17,7 +17,7 @@ A [service](https://v2.developer.pagerduty.com/v2/page/api-reference#!/Services/
 resource "pagerduty_user" "example" {
   name  = "Earline Greenholt"
   email = "125.greenholt.earline@graham.name"
-  teams = ["${pagerduty_team.example.id}"]
+  teams = [pagerduty_team.example.id]
 }
 
 resource "pagerduty_escalation_policy" "foo" {
@@ -29,7 +29,7 @@ resource "pagerduty_escalation_policy" "foo" {
 
     target {
       type = "user"
-      id   = "${pagerduty_user.example.id}"
+      id   = pagerduty_user.example.id
     }
   }
 }
@@ -38,7 +38,7 @@ resource "pagerduty_service" "example" {
   name                    = "My Web App"
   auto_resolve_timeout    = 14400
   acknowledgement_timeout = 600
-  escalation_policy       = "${pagerduty_escalation_policy.example.id}"
+  escalation_policy       = pagerduty_escalation_policy.example.id
   alert_creation          = "create_incidents"
 }
 ```
@@ -96,7 +96,7 @@ resource "pagerduty_service" "foo" {
   description             = "bar bar bar"
   auto_resolve_timeout    = 3600
   acknowledgement_timeout = 3600
-  escalation_policy       = "${pagerduty_escalation_policy.foo.id}"
+  escalation_policy       = pagerduty_escalation_policy.foo.id
 
   incident_urgency_rule {
     type = "use_support_hours"
diff --git a/website/docs/r/service_integration.html.markdown b/website/docs/r/service_integration.html.markdown
index 5f2805b68..f3d02c7f4 100644
--- a/website/docs/r/service_integration.html.markdown
+++ b/website/docs/r/service_integration.html.markdown
@@ -16,7 +16,7 @@ A [service integration](https://v2.developer.pagerduty.com/v2/page/api-reference
 resource "pagerduty_user" "example" {
   name  = "Earline Greenholt"
   email = "125.greenholt.earline@graham.name"
-  teams = ["${pagerduty_team.example.id}"]
+  teams = [pagerduty_team.example.id]
 }
 
 resource "pagerduty_escalation_policy" "foo" {
@@ -28,7 +28,7 @@ resource "pagerduty_escalation_policy" "foo" {
 
     target {
       type = "user"
-      id   = "${pagerduty_user.example.id}"
+      id   = pagerduty_user.example.id
     }
   }
 }
@@ -37,13 +37,13 @@ resource "pagerduty_service" "example" {
   name                    = "My Web App"
   auto_resolve_timeout    = 14400
   acknowledgement_timeout = 600
-  escalation_policy       = "${pagerduty_escalation_policy.example.id}"
+  escalation_policy       = pagerduty_escalation_policy.example.id
 }
 
 resource "pagerduty_service_integration" "example" {
   name    = "Generic API Service Integration"
   type    = "generic_events_api_inbound_integration"
-  service = "${pagerduty_service.example.id}"
+  service = pagerduty_service.example.id
 }
 
 data "pagerduty_vendor" "datadog" {
@@ -51,9 +51,9 @@ data "pagerduty_vendor" "datadog" {
 }
 
 resource "pagerduty_service_integration" "datadog" {
-  name    = "${data.pagerduty_vendor.datadog.name}"
-  service = "${pagerduty_service.example.id}"
-  vendor  = "${data.pagerduty_vendor.datadog.id}"
+  name    = data.pagerduty_vendor.datadog.name
+  service = pagerduty_service.example.id
+  vendor  = data.pagerduty_vendor.datadog.id
 }
 
 data "pagerduty_vendor" "cloudwatch" {
@@ -61,9 +61,9 @@ data "pagerduty_vendor" "cloudwatch" {
 }
 
 resource "pagerduty_service_integration" "cloudwatch" {
-  name    = "${data.pagerduty_vendor.cloudwatch.name}"
-  service = "${pagerduty_service.example.id}"
-  vendor  = "${data.pagerduty_vendor.cloudwatch.id}"
+  name    = data.pagerduty_vendor.cloudwatch.name
+  service = pagerduty_service.example.id
+  vendor  = data.pagerduty_vendor.cloudwatch.id
 }
 ```
 
diff --git a/website/docs/r/team_membership.html.markdown b/website/docs/r/team_membership.html.markdown
index 6d61ff194..9d6e0c3cc 100644
--- a/website/docs/r/team_membership.html.markdown
+++ b/website/docs/r/team_membership.html.markdown
@@ -24,8 +24,8 @@ resource "pagerduty_team" "foo" {
 }
 
 resource "pagerduty_team_membership" "foo" {
-  user_id = "${pagerduty_user.foo.id}"
-  team_id = "${pagerduty_team.foo.id}"
+  user_id = pagerduty_user.foo.id
+  team_id = pagerduty_team.foo.id
   role    = "manager"
 }
 ```
diff --git a/website/docs/r/user_contact_method.html.markdown b/website/docs/r/user_contact_method.html.markdown
index 1b895e922..7bcb318eb 100644
--- a/website/docs/r/user_contact_method.html.markdown
+++ b/website/docs/r/user_contact_method.html.markdown
@@ -17,18 +17,18 @@ A [contact method](https://v2.developer.pagerduty.com/v2/page/api-reference#!/Us
 resource "pagerduty_user" "example" {
   name  = "Earline Greenholt"
   email = "125.greenholt.earline@graham.name"
-  teams = ["${pagerduty_team.example.id}"]
+  teams = [pagerduty_team.example.id]
 }
 
 resource "pagerduty_user_contact_method" "email" {
-  user_id = "${pagerduty_user.example.id}"
+  user_id = pagerduty_user.example.id
   type    = "email_contact_method"
   address = "foo@bar.com"
   label   = "Work"
 }
 
 resource "pagerduty_user_contact_method" "phone" {
-  user_id      = "${pagerduty_user.example.id}"
+  user_id      = pagerduty_user.example.id
   type         = "phone_contact_method"
   country_code = "+1"
   address      = "2025550199"
@@ -36,7 +36,7 @@ resource "pagerduty_user_contact_method" "phone" {
 }
 
 resource "pagerduty_user_contact_method" "sms" {
-  user_id      = "${pagerduty_user.example.id}"
+  user_id      = pagerduty_user.example.id
   type         = "sms_contact_method"
   country_code = "+1"
   address      = "2025550199"