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Income Taxes - Provision for Income Taxes (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
Tax provision at U.S. federal statutory rates 21.00% 21.00% 21.00%
State income taxes net of federal benefit 7.80% 7.70% 8.10%
Non-deductible permanent items 3.70% 0.30% 3.30%
Variable interest entities (1.30%) (0.20%) (2.70%)
Stock-based compensation (1.00%) 0.30% (1.50%)
Change in valuation allowance 8.90% 3.20% 3.20%
Investment basis adjustment (2.10%) 0.00% 0.00%
Other 0.00% (1.00%) 0.20%
Effective income tax rate 36.90% 31.30% 31.60%