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Income Taxes - Effective Income Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]        
Taxes at statutory rate 21.00% 21.00% 21.00% 35.00%
State taxes, net of federal benefit 5.60% 5.30% 5.20%  
Foreign tax rate differential 0.30% 0.30% 0.50%  
Executive compensation 2.40% 0.60% 1.00%  
Other permanent differences 0.10% 0.70% 0.80%  
Prior year tax adjustments (1.10%) (1.00%) 0.20%  
Unrecognized tax benefits 1.00% (0.20%) (0.60%)  
Valuation allowance 1.60% 1.10% 1.30%  
Equity-based compensation (3.80%) (3.60%) (3.00%)  
Tax credits (0.70%) (0.60%) (0.50%)  
Taxes at effective rate 26.40% 23.60% 25.90%