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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Tax Disclosure [Abstract]        
Income tax provision $ 13,147 $ 10,735 $ 18,213 $ 13,666
Effective income tax rate (as a percent) 37.20% 35.80% 36.10% 36.10%
Statutory U.S. income tax rate (as a percent)     35.00% 35.00%
Income taxes paid (refunds), net     $ 2,500 $ (8,900)