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Stock Compensation Plans - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2012
May 23, 2017
Apr. 25, 2012
May 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized         8,500,000 4,500,000 2,000,000
Stock-based compensation expense $ 1,100 $ 800 $ 1,600        
Performance-based stock options     200,000        
Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Fair value of vested stock options 73 0 $ 0        
Total intrinsic value of stock options exercised $ 65 $ 0 $ 6        
Performance-based stock options 100,000 200,000          
Stock Appreciation Rights (SARs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total intrinsic value of stock options exercised $ 900            
Number of shares granted 0     1,400,000      
Weighted average grant-date fair value, granted       $ 0.68      
Award vesting period       3 years      
Maximum number of shares to be issued 162,393 360,031          
Stock Appreciation Rights (SARs) | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Expiration period       7 years      
Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted average remaining requisite service period (in years) 1 year 7 months 68 days            
Number of shares granted 289,648            
Weighted average grant-date fair value, granted $ 3.51 $ 2.24 $ 2.00        
Unrecognized stock-based compensation cost $ 1,100            
Vesting of RSU's, value $ 600 $ 1,400 $ 1,800        
Restricted Stock Units (RSUs) | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period 3 years            
Restricted Stock Units (RSUs) | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period 1 year