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Income Taxes and Related Payments - Components of deferred tax assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Amortizable basis $ 446,954 $ 408,140 $ 404,715
2018 Follow-On Offering 64,087 30,967 20,303
Deferred Tax Assets, Exchanges 48,474 13,424  
Amortization (34,686) (31,872)  
Other Tax Expense (Benefit) 3,602 21,873  
Amounts payable under tax receivable agreements 412,468 375,324 369,355
Establishment of Amounts Payable Under Tax Receivable Agreements 41,203 11,410  
Tax Receivable Agreement Payments 26,943 24,998 36,111
Net (Gain) Loss On The Tax Receivable Agreements Other 4,673 19,557  
Interest Paid, Including Capitalized Interest, Operating and Investing Activities 60 78  
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability 3,700 17,200  
Deferred tax assets:      
Amortizable basis 446,954 408,140 $ 404,715
Other 35,107 27,757  
Total deferred tax assets 482,061 435,897  
Less: valuation allowance 0 0  
Net deferred tax assets 482,061 $ 435,897  
Follow On Offering      
2018 Follow-On Offering 21,424    
Establishment of Amounts Payable Under Tax Receivable Agreements $ 18,211