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Employment and Compensation Arrangements - PSU activity (Details) - USD ($)
3 Months Ended 9 Months Ended
Aug. 15, 2021
May 15, 2021
Mar. 01, 2021
May 13, 2019
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Shareholders' Equity                    
Granted         565,896          
Granted         $ 23.70          
Vesting period       3 years            
Authorized grants                   60,000,000
Share-based compensation expense         $ 11,997,000   $ 6,796,000 $ 38,518,000 $ 31,121,000  
Transaction Related Awards 2019                    
Shareholders' Equity                    
Authorized grants       7,000,000            
Share-based compensation expense           $ 13,720,000        
PSUs                    
Shareholders' Equity                    
Outstanding as of December 31, 2020           873,325   873,325    
Vested               (5,633)    
Outstanding as of September 30, 2021         1,304,946     1,304,946    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value         $ 25.02     $ 25.02   $ 25.84
Exercise of Private Placement Warrants               32.50    
Outstanding as of September 30, 2021         $ 25.02     $ 25.02    
Vesting period               3 years    
Share-based compensation expense               $ 0    
TSR PSUs                    
Shareholders' Equity                    
Vesting period               3 years    
Share-based compensation expense         $ 790,000     $ 3,048,000    
TSR PSUs | Minimum                    
Shareholders' Equity                    
Share-based Compensation Arrangement by Share-based Payment Award, Payout As A Percent Of Target               0.00%    
TSR PSUs | Maximum                    
Shareholders' Equity                    
Share-based Compensation Arrangement by Share-based Payment Award, Payout As A Percent Of Target               120.00%    
Total Shareholder Return Performance Stock Units 2021                    
Shareholders' Equity                    
Granted 38,178 28,577 499,141              
Vesting period               3 years    
Share-based compensation expense         $ 306,000     $ 741,000    
Total Shareholder Return Performance Stock Units 2021 | Minimum                    
Shareholders' Equity                    
Share-based Compensation Arrangement by Share-based Payment Award, Payout As A Percent Of Target               0.00%    
Total Shareholder Return Performance Stock Units 2021 | Maximum                    
Shareholders' Equity                    
Share-based Compensation Arrangement by Share-based Payment Award, Payout As A Percent Of Target               200.00%