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Stock Compensation Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 06, 2017
May 25, 2017
May 16, 2017
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jun. 07, 2017
Mar. 09, 2017
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based compensation           $ 7,266 $ 2,539 $ 3,134      
Stock bonus plan shares authorized                     250,000
Shares avaibile in stock bonus plan       86,383 86,383 86,383          
Restricted Stock Units (RSUs) [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Units outstanding value       $ 6,200 $ 6,200 $ 6,200          
Share price (in dollars per share)                   $ 6.53  
Value of units vested in the period           7,100 $ 2,400 $ 3,000      
Expected share based compensation expense       $ 2,000 $ 2,000 $ 2,000          
Stock bonus plan shares authorized       4,850,000 4,850,000 4,850,000          
Shares avaibile in stock bonus plan       1,393,068 1,393,068 1,393,068          
Restricted Stock Units (RSUs) [Member] | Compensation Committee Plan for Chairman, President, and Chief Financial Officer [Member] | Chairman, President, and Chief Financial Officer [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock issued during period, shares     495,000                
Share price (in dollars per share)     $ 7.74                
Allocated share-based compensation expense     $ 3,800                
Restricted Stock Units (RSUs) [Member] | Restricted Stock Unit Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Additiona shares authorized for RSU plan   1,000,000                  
Share-based compensation plan expiration date           May 25, 2027          
Restricted Stock Units (RSUs) [Member] | Four-Year Compensation Plan [Member] | Chairman, President, and Chief Financial Officer [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share price (in dollars per share)                 $ 8.23    
Share-based compensation plan expiration date         Dec. 16, 2021            
RSUs granted in period 645,000                    
Annual percentage vested       25.00%