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Equity-Based Compensation (Equity Based Awards - Settled in Cash) (Details) - USD ($)
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Accrued equity based compensation $ 21,600,000   $ 18,200,000
Non Current Liabilities      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Accrued equity based compensation 18,000,000.0   $ 14,700,000
Management Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based liabilities paid (in thousands) $ 3,510,000 $ 4,433,000  
Management Stock Purchase Plan | Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Average company stock price measurement period 200 days    
Restricted stock units credited (in shares) $ 26,240 $ 52,965