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Income Taxes - Provision for Income Taxes (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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 7.70% 8.10% 6.70%
Non-deductible permanent items 0.30% 3.30% 1.30%
Non-taxable entities (0.20%) (2.70%) (0.70%)
Stock-based compensation 0.30% (1.50%) (1.80%)
Change in valuation allowance 3.20% 3.20% 0.00%
Other (1.00%) 0.20% 0.60%
Effective income tax rate 31.30% 31.60% 27.10%