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Stock-Based Compensation Compensation Expense and Related Tax Benefits (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Stock-based compensation expense $ 1,035 $ 1,820 $ 1,769 $ 3,256
Tax benefit (1,940) (642) (2,684) (1,075)
Stock-based compensation expense, net of tax benefit $ (905) $ 1,178 $ (915) $ 2,181