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Share-Based Arrangements (Compensation Arrangements by Share-based Payment Award) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Share-based compensation expense $ 5,956 $ 5,686 $ 6,388