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Earnings (Loss) Per Share - Earnings per share basic and diluted (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator:        
Net earnings (loss) $ 5,069 $ (5,869) $ 10,214 $ (13,590)
Denominator:        
Basic weighted average shares outstanding (in shares) 9,655 9,756 9,663 9,760
Effect of dilutive securities:        
Employee share-based awards (in shares) 47   28  
Diluted weighted average shares outstanding (in shares) 9,702 9,756 9,691 9,760
Basic earnings (loss) per share (in dollars per share) $ 0.53 $ (0.60) $ 1.06 $ (1.39)
Diluted earnings (loss) per share (in dollars per share) $ 0.52 $ (0.60) $ 1.05 $ (1.39)