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Earnings Per Share - Earning per share basic and diluted (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator:        
Net earnings (loss) $ 3,820 $ (8,883) $ 5,145 $ (7,721)
Denominator:        
Basic weighted average shares outstanding (in shares) 9,654 9,745 9,667 9,763
Effect of dilutive securities:        
Employee share-based awards (in shares) 32 0 19 0
Diluted weighted average shares outstanding (in shares) 9,686 9,745 9,686 9,763
Basic earnings (loss) per share (in dollars per share) $ 0.39 $ (0.91) $ 0.53 $ (0.79)
Diluted earnings (loss) per share (in dollars per share) $ 0.39 $ (0.91) $ 0.53 $ (0.79)