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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
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net earnings	$ 1,162	$ 3,968
Denominator:
Basic weighted average shares outstanding (in shares)	9,781	9,949
Effect of dilutive securities:
Employee stock-based awards (in shares)	5	78
Diluted weighted average shares outstanding (in shares)	9,786	10,027
Basic earnings per share (in dollars per share)	$ 0.12	$ 0.40
Diluted earnings per share (in dollars per share)	$ 0.12	$ 0.40

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