Stock-Based Compensation - Stock Option and Restricted Stock Unit Activity (Details) - $ / shares	3 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, Quantity (in shares)	1,730,807	2,147,750
Stock options, Wtd-Avg (usd per share)	$ 8.74	$ 14.67
Granted (in shares)	0
Exercised (in shares)	139,000
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, Quantity (in shares)	6,973,066	8,332,150
Stock units, Wtd-Avg (usd per share)	$ 11.09	$ 10.77
Vested (in shares)	0
Other vested (in shares)	1,300,000
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, Quantity (in shares)	1,176,989	1,453,663
Stock units, Wtd-Avg (usd per share)	$ 6.76	$ 13.60
Vested (in shares)	0
Other vested (in shares)	258,000
Market-based stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, Quantity (in shares)	410,078	434,921
Stock units, Wtd-Avg (usd per share)	$ 12.63	$ 12.63
Vested (in shares)	0
Other vested (in shares)	22,000

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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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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- Definition

Gross number of share options (or share units) granted during the period.

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- Definition

Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of share options (or share units) exercised during the current period.

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