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Income Taxes - Effective income tax reconciliation (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
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 5.60% 4.50% 212.70%
Non-deductible mark-to-market losses 11.50% 0.00% 0.00%
Excess tax benefits from stock-based compensation (0.90%) 0.50% (60.40%)
Nondeductible expenses 0.20% 0.40% 118.70%
Reserve for uncertain tax positions (0.80%) 0.70% (13.70%)
Other 1.50% (0.60%) 12.20%
Effective income tax rate 38.10% 26.50% 290.50%