Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of noncash expense for share-based payment arrangement.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Amount of cash paid to settle liability for award under share-based payment arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of vesting of award under share-based payment arrangement.

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Stock Based Compensation - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	$ 2
Stock based compensation expense		$ 2,000,000.0	$ 4,728,000	$ 5,187,000
Share-based Payment Arrangement, Expense			$ 0
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of stock (in shares)	0		550,829
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 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of stock (in shares)	0		490,227
Performance Stock Unit [Member] \| 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 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of stock (in shares)	1
One Year Vesting Restricted Stock [Member] \| 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 [Member] \| Share-based Compensation Award, 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 [Member] \| 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 [Member] \| Share-based Compensation Award, 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 [Member] \| Share-based Compensation Award, 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 [Member] \| Other Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of stock (in shares)	285,030
Three Year Vesting Restricted Stock, March Schedule [Member] \| Share-based Compensation Award, 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 [Member] \| Share-based Compensation Award, 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 [Member] \| Share-based Compensation Award, 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 [Member] \| Share-based Compensation Award, 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 [Member] \| Share-based Compensation Award, 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 [Member] \| Share-based Compensation Award, 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 [Member] \| Share-based Compensation Award, 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 [Member] \| Share-based Compensation Award, 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 [Member] \| Share-based Compensation Award, 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 [Member] \| 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 [Member] \| Share-based Compensation Award, 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 [Member] \| Share-based Compensation Award, 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 [Member] \| Share-based Compensation Award, 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 [Member] \| Share-based Compensation Award, 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 [Member] \| Share-based Compensation Award, Tranche Three \| Other Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, vesting percentage			33.33%