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Stock-Based Compensation (Restricted Stock Narrative) (Details) - Restricted Stock - USD ($)
$ in Thousands
12 Months Ended
Apr. 06, 2016
Jan. 06, 2016
Jun. 18, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted       139,451    
Share-based compensation expense       $ 1,793 $ 2,944 $ 2,818
Total unrecognized compensation expense       $ 1,638    
Unrecognized compensation cost related to stock options, weighted average period for recognition       2 years    
Chief Executive Officer            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted   75,915        
Award vesting period   2 years        
Chief Financial Officer            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted 20,000          
Vice President of Technical Services            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted 20,000          
Executive Officer            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period 2 years          
Director            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted 23,536          
Award vesting period 1 year          
2009 Restricted Stock/Units Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Additional shares authorized     500,000      
Number of shares authorized     800,000      
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number       268,005