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Shareholders' Equity (Share-based Compensation Expense and Related Tax Benefits) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Equity [Abstract]        
Share-based compensation expense $ 1,615 $ 2,746 $ 2,517 $ 6,092
Related tax benefits $ 339 $ 961 $ 529 $ 2,132