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Stock-Based Compensation Plans (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 01, 2021
Sep. 30, 2021
Sep. 30, 2021
Feb. 02, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock, par value         $ 0.001
Cancelled stock incentive plans     $ 0    
Director Restricted Stock Award Agreement [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 113,840        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Net 76,269        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 39.53        
Unamortized estimated grant date fair value   $ 2,700,000 2,700,000    
Employee Restricted Stock Award Agreement [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   2,000,000.0      
Unamortized estimated grant date fair value   $ 1,700,000 $ 1,700,000    
Original Senior Unsecured Notes Due 2021 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stated interest rate   7.125% 7.125%    
New Senior Unsecured Notes Due 2021 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stated interest rate   7.125% 7.125% 7.125% 7.125%
Senior Unsecured Notes Due 2024 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stated interest rate   7.75% 7.75% 7.75% 7.75%
Common Class A [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock, par value   $ 0.01 $ 0.01    
Common Class B [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock, par value   $ 0.01 $ 0.01    
2021 Management Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for issuance 1,999,869        
Common stock, par value $ 0.01