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Stock-Based Compensation - Schedule of Non-Vested Share Based RSU's and PRSU's (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted Stock Units (RSUs)
Number of Shares
Beginning balance (in shares)	2,188,965
Granted (in shares)	1,756,125
Vested (in shares)	(1,138,654)
Forfeited (in shares)	(345,636)
Ending balance (in shares)	2,460,800	2,188,965
Weighted Average Grant Date Fair Value
Beginning balance (in USD per share)	$ 7.66
Granted (in USD per share)	6.49
Vested (in USD per share)	7.87
Forfeited (in USD per share)	6.81
Ending balance (in USD per share)	$ 6.65	$ 7.66
PRSUs
Number of Shares
Beginning balance (in shares)	593,987
Granted (in shares)	446,858	275,550	293,083
Forfeited (in shares)	(252,012)
Ending balance (in shares)	788,833	593,987
Weighted Average Grant Date Fair Value
Beginning balance (in USD per share)	$ 8.06
Granted (in USD per share)	8.22
Forfeited (in USD per share)	7.96
Ending balance (in USD per share)	$ 8.13	$ 8.06

X

- Definition

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

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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The weighted average fair value at grant date for nonvested equity-based awards issued 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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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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