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Share-based Compensation - Summary of Activity in RSUs and RSAs (Details) - 2015 Management Incentive Plan - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
RSUs and RSAs
Number of RSUs and RSAs
Outstanding at beginning of period (in shares)	2,993,489	1,378,922	853,047
Granted (in shares)	3,318,169	4,063,541	1,265,899
Forfeited (in shares)	(430,961)	(643,709)	(127,493)
Vested (in shares)	(2,487,613)	(1,805,265)	(612,531)
Outstanding at end of period (in shares)	3,393,084	2,993,489	1,378,922
Weighted Average Fair Value
Outstanding at beginning of period (in dollars per share)	$ 24.10	$ 20.03	$ 17.94
Granted (in dollars per share)	17.49	25.07	20.89
Forfeited (in dollars per share)	17.45	21.58	18.30
Vested (in dollars per share)	20.17	24.08	18.76
Outstanding at end of period (in dollars per share)	$ 21.35	$ 24.10	$ 20.03
RSUs and RSAs, performance-based
Number of RSUs and RSAs
Granted (in shares)	400,000

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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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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