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Employment and Compensation Arrangements - Private Placement Warrant (Details) - $ / shares
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Shareholders' Equity        
Beginning Balance 52,800,000      
Exercise of Private Placement Warrants (212,174) 0    
Restricted Stock Units (RSUs)        
Shareholders' Equity        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 23.68   $ 19.30  
Warrant [Member]        
Shareholders' Equity        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value 11.00 $ 18.36 $ 17.35 $ 6.11
Exercised $ 16.93 $ 0    
Private Warrant        
Shareholders' Equity        
Beginning Balance 18,026,000 18,300,000    
Closing Balance 17,813,826 18,300,000