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Share-Based Compensation (Narrative Disclosures) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Number of shares available for grant 210,780  
Deferred compensation expense yet to be recognized $ 2,200  
Period of time that deferred compensation expense will be recognized 2 years 8 months 12 days  
Share-based compensation $ 286 $ 276