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Employment and Compensation Arrangements - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Number of Options          
Granted     0    
Outstanding at end of year 5,114,652   5,114,652    
Weighted Average Exercise Price per Share          
Granted     $ 0    
Employee Stock Option          
Number of Options          
Outstanding at beginning of year     7,860,618    
Expired     0    
Forfeited     0    
Exercised (328,531) (4,068,307) (2,745,966) (11,507,094)  
Outstanding at end of year         7,860,618
Vested and exercisable at September 30, 2021 5,114,652   5,114,652    
Weighted Average Exercise Price per Share          
Outstanding at beginning of year     $ 12.95    
Expired     0    
Forfeited     0    
Exercised     12.12    
Outstanding at end of year $ 13.40   13.40   $ 12.95
Vested and exercisable $ 13.40   $ 13.40    
Weighted-Average Remaining Contractual Life (in years)          
Outstanding at beginning of year     5 years 7 months 6 days   6 years 2 months 12 days
Outstanding at end of year     5 years 7 months 6 days   6 years 2 months 12 days
Aggregate Intrinsic Value          
Outstanding at beginning of year     $ 131,956    
Outstanding at end of year $ 45,015   45,015   $ 131,956
Vested and exercisable at September 30, 2021 $ 45,015   45,015    
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Aggregate Intrinsic Value Exercised     $ 39,737 $ 141,143