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Share-Based Compensation Share-Based Compensation (Compensation Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Share-based compensation $ 1,004 $ 1,078 $ 994