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Share-Based Compensation (Share-Based Payment Plan Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Share-based compensation $ 268 $ 292 $ 811 $ 858