XML 69 R58.htm IDEA: XBRL DOCUMENT v3.8.0.1
Stock-Based Compensation Compensation Expense and Related Tax Benefits (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Compensation expense $ 1,510 $ 734
Tax benefit (461) (744)
Stock-based compensation expense, net of tax benefit $ 1,049 $ (10)