Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Taxes        
Effective tax rate (as a percent) 24.60% 34.00% 22.70% 30.00%
Reserve for uncertain tax positions   $ 556   $ 556
Excess tax benefits from stock compensation     $ 530 $ 616