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Earnings per Share - Details of Earnings Per Share Calculations (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings per Share        
Net income (loss) $ (1,002) $ 110 $ 790 $ 683
Weighted average common shares outstanding:        
Basic (in shares) 39,908 39,797 39,902 39,783
Incremental shares with dilutive effect:        
Incremental shares with dilutive effect (in shares)   45 113 60
Diluted (in shares) 39,908 39,842 40,015 39,843
Basic (in dollars per share) $ (0.03) $ 0.00 $ 0.02 $ 0.02
Diluted (in dollars per share) $ (0.03) $ 0.00 $ 0.02 $ 0.02