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Equity-Based Compensation - Summary of Activity Related to Stock Options (Details) - Stock Options - $ / shares
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Number Outstanding    
Outstanding at January 1, 728,534 2,017,067
Exercises (728,534) (351,101)
Forfeitures or expirations   (3,000)
Outstanding at June 30,   1,662,966
Weighted-Average Exercise Price Per Share    
Outstanding at January 1, $ 15.95 $ 15.95
Exercises 15.95 15.95
Forfeitures or expirations   15.95
Outstanding at June 30, $ 15.95 $ 15.95