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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Operating Loss Carryforwards [Line Items]            
Income tax provision $ 33,019   $ 32,911 $ 59,865 $ 51,880  
Effective income tax rates 37.50%   37.50% 37.70% 37.60%  
Actual income tax rates 36.80%   36.80% 35.30% 36.30%  
Unrecognized income tax benefits $ 1,900     $ 1,900   $ 4,000
Unrecognized income tax benefits, if recognized, that would favorably affect the effective income tax rate 600     600   2,200
Accrued interest expense related to unrecognized income tax benefits 200     200   $ 500
Interest income related to unrecognized income tax benefits       300    
Interest expense related to unrecognized income tax benefits 100   $ 100   $ 100  
Unrecognized income tax benefits to be recognized in the next twelve months $ 1,200     $ 1,200    
Unrecognized tax benefits, decrease resulting from settlements with taxing authorities   $ 3,300