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Income Taxes - Effective Income Tax Rate Reconciliation (Details) | 12 Months Ended
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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% |

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