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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Stock-based compensation expense $ 1,820 $ 1,767 $ 3,256 $ 2,838
Tax benefit (642) (622) (1,075) (914)
Stock-based compensation expense, net of tax $ 1,178 $ 1,145 $ 2,181 $ 1,924