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Equity-Based Compensation (Equity Based Awards - Settled in Cash) (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Accrued equity based compensation $ 28,700,000   $ 28,000,000.0
Non Current Liabilities      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Accrued equity based compensation 12,200,000   $ 13,200,000
Management Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based liabilities paid (in thousands) $ 4,433,000 $ 4,933,000  
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) $ 52,411 $ 51,608