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Income Taxes - Effective income tax reconciliation (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Effective Income Tax Rate, Tax Rate Reconciliation      
Statutory rate 21.00% 35.00% 35.00%
Effect of:      
State and local income taxes, net of federal tax benefit 3.00% 2.20% 3.00%
Excess tax benefits from stock-based compensation 0.90% 7.10% (1.80%)
Nondeductible expenses 1.50% (4.60%) 1.40%
Reserve for uncertain tax positions (0.20%) 3.60% (0.80%)
U.S. federal statutory rate change 0.00% 13.20% 0.00%
Other (1.80%) 6.00% (1.10%)
Effective income tax rate 24.40% 62.50% 35.70%