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Equity-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended 36 Months Ended
Sep. 22, 2017
Sep. 30, 2017
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Intrinsic value of units exercised     $ 85 $ 0 $ 0  
Tax benefit from compensation expense     $ 2,700 $ 1,900 $ 1,500  
Common Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options granted (in shares)     0 0 0  
Total fair value of units vested     $ 26,600 $ 9,400 $ 10,700  
Unrecognized equity-based compensation cost related to awards     $ 1,900     $ 1,900
Weighted average recognition period for equity-based compensation cost     9 months 10 days      
Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average recognition period for equity-based compensation cost     2 years 6 months 25 days      
Unrecognized equity-based compensation cost related to stock options     $ 7,100     $ 7,100
Chief Executive Officer | Common Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options granted (in shares)   7,500,000        
Awards converted into Common Units (in shares)       7,500,000    
President | Common Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options granted (in shares)   1,500,000        
Hurdle amount (in dollars per share)   $ 11.69        
Awards converted into Common Units (in shares)       472,000    
2005 Common Membership Unit Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options outstanding (in shares)     0     0
Options granted (in shares)     0 0 0  
Options vested (in shares)     0 0 0  
Intrinsic value of units exercised         $ 1,200  
2017 Incentive Award Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options outstanding (in shares)     9,063,000 8,342,000   9,063,000
Options granted (in shares)     1,117,000      
Vesting period     10 years      
2017 Incentive Award Plan | Class A Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for issuances (in shares) 25,000,000.0          
Potential increase in shares available for issuance (in shares) 17,000,000.0          
Potential increase in shares available for issuance as a percentage of shares outstanding 5.00%          
Annual increase in shares reserved and available for issuance (in shares)           13,300,000
2017 Incentive Award Plan | RSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options granted (in shares)     1,454,000      
Total fair value of units vested     $ 15,102 $ 5,114 $ 2,925  
Weighted average recognition period for equity-based compensation cost       2 years 3 months 25 days    
Unrecognized equity-based compensation cost related to RSUs     $ 32,200     $ 32,200
Director Compensation Program | RSAs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average recognition period for equity-based compensation cost     5 months 12 days      
Unrecognized equity-based compensation cost related to RSUs     $ 600     $ 600