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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Operating Loss Carryforwards [Line Items]          
Income tax provision $ 30,783 $ 25,720 $ 82,663 $ 74,672  
Effective income tax rates 38.10% 38.00% 37.80% 37.90%  
Actual income tax rates 37.20% 38.10% 36.70% 38.00%  
Unrecognized tax benefits, reduction resulting from lapse of applicable statute of limitations $ 800        
Excess tax benefit from share-based compensation, tax provision     $ 2,100    
Unrecognized income tax benefits 3,900   3,900   $ 4,800
Unrecognized income tax benefits, if recognized, that would favorably affect the effective income tax rate 2,200   2,200   3,000
Accrued interest expense related to unrecognized income tax benefits 400   400   $ 400
Interest income related to unrecognized income tax benefits 100   100    
Interest expense related to unrecognized income tax benefits   $ 100   $ 100  
Unrecognized income tax benefits to be recognized in the next twelve months $ 3,300   $ 3,300