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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net earnings (loss)	$ (8,883)	$ 1,514	$ (7,721)	$ 5,482
Denominator:
Basic weighted average shares outstanding (in shares)	9,745	9,938	9,763	9,943
Effect of dilutive securities:
Employee share-based awards (in shares)		95		87
Diluted weighted average shares outstanding (in shares)	9,745	10,033	9,763	10,030
Basic earnings (loss) per share (in dollars per share)	$ (0.91)	$ 0.15	$ (0.79)	$ 0.55
Diluted earnings (loss) per share (in dollars per share)	$ (0.91)	$ 0.15	$ (0.79)	$ 0.55

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