Stock Based Compensation - Narrative (Details) - USD ($)	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2018	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost (in shares)	$ 2
Stock based compensation expense	$ 2,200,000	$ 2,400,000			$ 6,961,000	$ 7,593,000
Share-based payment arrangement expense					$ 0
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of stock (in shares)	6,257	1,065			557,086	242,638
Restricted stock | Non Employee Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of stock (in shares)					46,993
Performance Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of stock (in shares)	0		0	426,075	490,227
Performance Stock Unit | Other Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of stock (in shares)					400,460
Performance Stock Unit With Market Condition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of stock (in shares)	1
One Year Vesting Restricted Stock | Other Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of stock (in shares)					134,650
One Year Vesting Restricted Stock | Tranche One | Non Employee Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, vesting percentage					100.00%
Two Year Vesting Restricted Stock, March Schedule | Other Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of stock (in shares)					89,767
Two Year Vesting Restricted Stock, March Schedule | Tranche One | Other Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, vesting percentage					50.00%
Two Year Vesting Restricted Stock, March Schedule | Tranche Two | Other Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, vesting percentage					50.00%
Three Year Vesting Restricted Stock | Other Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of stock (in shares)					285,030
One Year Vesting Time-Based Restricted Stock | Other Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of stock (in shares)					6,257
One Year Vesting Time-Based Restricted Stock | Tranche One | Non Employee Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, vesting percentage					100.00%
Three Year Vesting Restricted Stock, March Schedule | Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, vesting percentage					33.33%
Three Year Vesting Restricted Stock, March Schedule | Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, vesting percentage					33.33%
Three Year Vesting Restricted Stock, March Schedule | Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, vesting percentage					33.33%
Three Year Vesting Restricted Stock, Grant Date Schedule | Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, vesting percentage					33.33%
Three Year Vesting Restricted Stock, Grant Date Schedule | Tranche One | Other Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, vesting percentage					33.33%
Three Year Vesting Restricted Stock, Grant Date Schedule | Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, vesting percentage					33.33%
Three Year Vesting Restricted Stock, Grant Date Schedule | Tranche One | Other Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, vesting percentage					33.33%
Three Year Vesting Restricted Stock, Grant Date Schedule | Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, vesting percentage					33.33%
Three Year Vesting Restricted Stock, Grant Date Schedule | Tranche Three | Other Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, vesting percentage					33.33%
Two Year Vesting Restricted Stock, Grant Date Schedule | Other Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of stock (in shares)					84,156
Two Year Vesting Restricted Stock, Grant Date Schedule | Tranche One | Non Employee Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, vesting percentage					50.00%
Two Year Vesting Restricted Stock, Grant Date Schedule | Tranche Two | Non Employee Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, vesting percentage					50.00%
Three Year Vesting Restricted Stock, March Schedule | Tranche One | Other Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, vesting percentage					33.33%
Three Year Vesting Restricted Stock, March Schedule | Tranche Two | Other Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, vesting percentage					33.33%
Three Year Vesting Restricted Stock, March Schedule | Tranche Three | Other Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, vesting percentage					33.33%