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EARNINGS PER SHARE - Earning per share basic and diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net earnings (loss)	$ (8,485)	$ 20,882
Denominator:
Basic weighted average shares outstanding (in shares)	9,757	9,904
Effect of dilutive securities:
Employee share-based awards (in shares)		49
Diluted weighted average shares outstanding (in shares)	9,757	9,953
Basic earnings (loss) per share	$ (0.87)	$ 2.11
Diluted earnings (loss) per share	$ (0.87)	$ 2.10

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