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Retirement Plans - Narrative (Details) - Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits - USD ($)
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Defined Contribution Plan Disclosure [Line Items]      
Deferred compensation liability, current and noncurrent $ 2,777,000   $ 2,591,000
Nonqualified Plan      
Defined Contribution Plan Disclosure [Line Items]      
Contributions by employer $ 0 $ 0  
Phantom shares issuable (in shares) 27,130,916   30,590,955
Share-based Payment Arrangement, Tranche One | Nonqualified Plan | Prior to January 2016 Awards      
Defined Contribution Plan Disclosure [Line Items]      
Vesting percentage 20.00%    
Share-based Payment Arrangement, Tranche One | Nonqualified Plan | After January 2016 Awards      
Defined Contribution Plan Disclosure [Line Items]      
Vesting percentage 100.00%    
Share-based Payment Arrangement, Tranche Two | Nonqualified Plan | Prior to January 2016 Awards      
Defined Contribution Plan Disclosure [Line Items]      
Vesting percentage 20.00%    
Share-based Payment Arrangement, Tranche Three | Nonqualified Plan | Prior to January 2016 Awards      
Defined Contribution Plan Disclosure [Line Items]      
Vesting percentage 20.00%    
Share-Based Payment Arrangement, Tranche Four | Nonqualified Plan | Prior to January 2016 Awards      
Defined Contribution Plan Disclosure [Line Items]      
Vesting percentage 20.00%    
Share-Based Payment Arrangement, Tranche Five | Nonqualified Plan | Prior to January 2016 Awards      
Defined Contribution Plan Disclosure [Line Items]      
Vesting percentage 20.00%