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Equity-Based Compensation - Summary of Restricted and Performance Share-Based Activity (Details) - Restricted and Performance Shares - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Unvested Shares      
Outstanding, beginning of the period (shares) 775,886 703,024 574,456
Granted/Earned (shares) 1,387,059 801,751 519,605
Forfeited/Cancelled (shares) (162,635) (272,706) (180,719)
Vested (shares) (552,943) (456,183) (210,318)
Outstanding, end of the period (shares) 1,447,367 775,886 703,024
Weighted Average Grant Date Fair Value      
Outstanding, beginning of the period (in USD per share) $ 13.78 $ 16.18 $ 15.95
Granted/Earned (in USD per share) 6.87 12.70 16.10
Forfeited/Cancelled (in USD per share) 13.77 12.97 15.09
Vested (in USD per share) 12.78 16.20 16.31
Outstanding, end of the period (in USD per share) $ 9.75 $ 13.78 $ 16.18