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Stock-Based Compensation Compensation Expense and Related Tax Benefits (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Stock-based compensation expense $ 1,533 $ 1,288 $ 4,371 $ 4,310
Tax benefit (489) (358) (1,403) (1,067)
Stock-based compensation expense, net of tax $ 1,044 $ 930 $ 2,968 $ 3,243