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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Taxes        
Effective tax rate (as a percent) 40.30% 37.70% 42.90% 39.70%
State and local taxes, net of federal benefit (as a percent) 0.10%   2.30%  
Effective tax rate before discrete tax expense relating to a change in state apportionment (as a percent) 40.20%   40.60%  
Gross additions for tax positions for prior years   $ 2   $ 986
Unrecognized tax benefits, interest and penalties accrued $ 25 $ 2 $ 72 $ 13