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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2017
Income Taxes [Abstract]  
Reconciliation of Statutory Federal Tax Rate
  Three Months Ended March 31,  
  2017   2016  
Federal income tax at statutory rate 35.0 % 35.0 %
State and local taxes, net of federal benefit 5.2   5.2  
Jobs tax credits, net (7.0 ) (25.0 )
Nondeductible permanent items 0.4   17.0  
Other (0.4 ) 0.7  
Effective income tax rate 33.2 % 32.9 %