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Income Taxes - Effective income tax reconciliation (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Effective Income Tax Rate, Tax Rate Reconciliation      
Statutory rate 35.00% 35.00% 35.00%
Effect of:      
State and local income taxes, net of federal tax benefit 3.50% 3.50% 3.40%
Equity compensation tax windfall deduction (1.60%) 0.00% 0.00%
Nondeductible expenses 1.30% (2.00%) 15.70%
Reserve for uncertain tax positions (0.70%) 2.50% (63.80%)
Goodwill impairment 0.00% (7.60%) 0.00%
Other (1.00%) 1.60% 8.50%
Effective income tax rate 36.50% 33.00% (1.20%)