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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Operating Loss Carryforwards [Line Items]      
Income tax provision $ 26,846 $ 18,969  
Effective income tax rates 37.80% 37.80%  
Actual income tax rates 33.60% 35.50%  
Unrecognized income tax benefits $ 1,900   $ 4,000
Unrecognized income tax benefits, if recognized, that would favorably affect the effective income tax rate 1,200   2,200
Accrued interest expense related to unrecognized income tax benefits 100   $ 500
Interest income related to unrecognized income tax benefits 400    
Interest expense related to unrecognized income tax benefits   $ 100  
Unrecognized income tax benefits to be recognized in the next twelve months 1,200    
Unrecognized tax benefits, decrease resulting from settlements with taxing authorities $ 3,300