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Income Taxes - Reconciliation of the federal statutory rate (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Income tax provision at federal statutory rate 21.00% 21.00% 35.00%
Increase (decrease) in tax resulting from:      
State taxes, net of federal benefit (13.20%) (2.90%) 0.60%
Noncontrolling interests in passthrough entities (98.00%) (44.00%) (32.30%)
Valuation allowance (6.20%) 28.70% 8.00%
Effective Income Tax Rate Reconciliation, Expiration Of Attributes, Percent 7.20% 4.30% 0.70%
Uncertain tax positions (129.30%) 4.80% 1.30%
Other permanent items, net 3.80% (0.50%) 0.70%
Effective income tax rate (214.70%) 11.40% 14.00%