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Equity-Based Compensation Plans - Summary of Activity of Unvested Restricted Stock and Stock Unit Awards (Details) - Restricted Stock and Stock Unit - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Shares/units [Roll Forward]      
Unvested Shares/units, Beginning balance 1,416 1,307 1,175
Granted, Shares/units 437 730 496
Vested, Shares/units (779) (457) (306)
Forfeited, Shares/units (81) (164) (58)
Unvested shares/units, Ending balance 993 1,416 1,307
Weighted Average Grant-Date Fair Value [Roll Forward]      
Unvested, Weighted Average Grant-Date Fair Value, Beginning balance $ 10.65 $ 11.55 $ 11.30
Granted, Weighted Average Grant-Date Fair Value 5.39 9.35 12.43
Weighted average share price 9.16 10.91 11.91
Forfeited, Weighted Average Grant-Date Fair Value 10.74 11.31 12.28
Unvested, Weighted Average Grant-Date Fair Value, Ending balance $ 9.50 $ 10.65 $ 11.55