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Income Taxes and Related Payments - Components of deferred tax assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Amortizable basis $ 408,140 $ 404,715 $ 410,690
2018 Follow-On Offering 30,967 20,303 120,320
Deferred Tax Assets, Exchanges 13,424 16,199  
Amortization (31,872) (29,851)  
Other Tax Expense (Benefit) 21,873 (10)  
Amounts payable under tax receivable agreements 375,324 369,355 385,413
Establishment of Amounts Payable Under Tax Receivable Agreements 11,410 13,770  
Tax Receivable Agreement Payments 24,998 36,111 30,234
Net (Gain) Loss On The Tax Receivable Agreements Other 19,557 (251)  
Interest Paid, Including Capitalized Interest, Operating and Investing Activities 78 115  
Deferred tax assets:      
Amortizable basis 408,140 404,715 $ 410,690
Other 27,757 24,413  
Total deferred tax assets 435,897 429,128  
Less: valuation allowance 0 0  
Net deferred tax assets $ 435,897 $ 429,128  
Tax rate used to measure deferred tax assets   23.50% 37.00%
Follow On Offering      
2018 Follow-On Offering   $ 7,687  
Establishment of Amounts Payable Under Tax Receivable Agreements   $ 6,534