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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Operating Loss Carryforwards [Line Items]      
Income tax provision $ 18,969 $ 20,225  
Effective income tax rates 37.80% 37.80%  
Actual income tax rates 35.50% 37.90%  
Excess tax benefit from share-based compensation, tax provision $ 1,200    
Unrecognized income tax benefits 4,800   $ 4,800
Unrecognized income tax benefits, if recognized, that would favorably affect the effective income tax rate 3,000   3,000
Accrued interest expense related to unrecognized income tax benefits 500   $ 400
Interest expense related to unrecognized income tax benefits 100 $ 100  
Unrecognized income tax benefits to be recognized in the next twelve months $ 4,100