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Share Based Award Stock Based Compensation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Stock compensation $ 19,352 $ 15,242 $ 12,827
Tax benefit from stock-based compensation cost 7,247 5,682 4,922
Indirect tax benefit 1,374 $ 0 $ 1,997
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 23,300    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 10 months