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Share-Based Compensation Share-Based Compensation (Compensation Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Share-based compensation $ 220 $ 268 $ 506 $ 544