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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Stock-based compensation expense $ 1,552 $ 1,533 $ 4,808 $ 4,371
Tax benefit (536) (489) (1,611) (1,403)
Stock-based compensation expense, net of tax $ 1,016 $ 1,044 $ 3,197 $ 2,968