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Stock-Based Compensation (Restricted Stock Narrative) (Details) - Restricted Stock - USD ($)
$ in Thousands
12 Months Ended
Mar. 19, 2015
Jun. 03, 2014
Jan. 23, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted       145,558    
Share-based compensation expense       $ 2,944 $ 2,818 $ 1,485
Total unrecognized compensation expense       $ 457    
Unrecognized compensation cost related to stock options, weighted average period for recognition       1 year    
Vice President of Technical Services            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted 20,000          
Chief Financial Officer            
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 1 year          
Director            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted 21,968          
Award vesting period 1 year          
Chief Executive Officer            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted     83,590      
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       361,394