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Stock-based Compensation - Stock Option Activity (Details) - 2008 LTIP - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Stock-based compensation    
Shares authorized to be granted under stock compensation plan 2,000,000  
Shares available for future awards 1,293,109  
Stock Options    
Number Outstanding    
Outstanding at beginning of period (in shares) 537,500 540,625
Granted during period (in shares) 0 0
Outstanding at end of period (in shares) 537,500 540,625
Exercisable at end of period (in shares) 267,500 180,625
Weighted Average Exercise Price    
Outstanding at beginning of period (in dollars per share) $ 2.19 $ 2.18
Outstanding at end of period (in dollars per share) 2.19 2.18
Exercisable at end of period (in dollars per share) $ 2.71 $ 3.29
Additional disclosures    
Stock based compensation expense $ 10 $ 10
Unrecognized compensation cost, options $ 113  
Period for recognizing unrecognized compensation cost 2 years 10 months 24 days