XML 64 R51.htm IDEA: XBRL DOCUMENT v3.7.0.1
Shareholders' Equity (Share-based Compensation Expense and Related Tax Benefits) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Equity [Abstract]        
Share-based compensation expense $ 2,746 $ 3,098 $ 6,092 $ 5,813
Related tax benefits $ 961 $ 1,084 $ 2,132 $ 2,035