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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net income	$ 10,184	$ 14,896
Denominator:
Denominator for basic earnings per share	26,172	26,236
Dilutive effect of unvested employee stock awards	188	185
Denominator for diluted earnings per share	26,360	26,421
Earnings per share:
Basic	$ 0.39	$ 0.57
Diluted	$ 0.39	$ 0.56
Additional Disclosure
Employee stock awards excluded from computation of diluted earnings per share	0	0

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