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Income Taxes - Effective income tax reconciliation (Details)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
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 0.10% 7.00% 5.60%
Non-deductible goodwill impairment (18.60%) 0.00% 0.00%
Non-deductible mark-to-market losses 0.00% 0.00% 11.50%
Excess tax benefits from stock-based compensation (0.20%) (0.30%) (0.90%)
Non-deductible expenses (0.10%) 0.20% 0.20%
Reserve for uncertain tax positions 0.00% 0.70% (0.80%)
Other (0.20%) 0.50% 1.50%
Effective income tax rate 2.00% 29.10% 38.10%