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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Operating Loss Carryforwards [Line Items]          
Income tax provision $ 32,911 $ 28,727 $ 51,880 $ 48,952  
Effective income tax rates 37.50% 37.80% 37.60% 37.80%  
Actual income tax rates 36.80% 38.00% 36.30% 37.90%  
Excess tax benefit from share-based compensation, tax provision $ 1,800        
Unrecognized income tax benefits 4,800   $ 4,800   $ 4,800
Unrecognized income tax benefits, if recognized, that would favorably affect the effective income tax rate 3,000   3,000   3,000
Accrued interest expense related to unrecognized income tax benefits 500   500   $ 400
Interest expense related to unrecognized income tax benefits 100 $ 100 100 $ 100  
Unrecognized income tax benefits to be recognized in the next twelve months $ 4,100   $ 4,100