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Equity-Based Compensation - Summary of Activity Related to Stock Options (Details) - Stock Options - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Number Outstanding      
Outstanding at January 1, 2,017,067 2,436,232 2,822,728
Exercises (1,285,533) (351,904) (279,277)
Forfeitures or expirations (3,000) (67,261) (107,219)
Outstanding at December 31, 728,534 2,017,067 2,436,232
Weighted-Average Exercise Price Per Share      
Outstanding at January 1, $ 16.70 $ 16.70 $ 16.70
Exercises 16.70 16.70 16.70
Forfeitures or expirations 16.70 16.70 16.70
Outstanding at December 31, $ 16.70 $ 16.70 $ 16.70