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Income Taxes - Effective income tax reconciliation (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Effective Income Tax Rate, Tax Rate Reconciliation      
Statutory rate 21.00% 21.00% 21.00%
Effect of:      
State and local income taxes, net of federal tax benefit 4.50% 212.70% 3.70%
Excess tax benefits from stock-based compensation 0.50% (60.40%) 0.70%
Nondeductible expenses 0.40% 118.70% 1.20%
Reserve for uncertain tax positions 0.70% (13.70%) (0.10%)
Other (0.60%) 12.20% (1.90%)
Effective income tax rate 26.50% 290.50% 24.60%