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Stock Based Compensation (Stock based compensation expense) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock based compensation $ 1,775 $ 1,231
Restricted stock units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock based compensation [1] 1,658 1,004
Restricted stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock based compensation 91 136
Stock options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock based compensation $ 26 $ 91
[1] Includes service-based and performance-based restricted stock units.