EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net income	$ 25,398	$ 17,292	$ 47,190	$ 27,476
Denominator:
Denominator for basic earnings per share	26,268	26,187	26,262	26,180
Dilutive effect of unvested employee stock awards	161	172	155	181
Denominator for diluted earnings per share	26,429	26,359	26,417	26,361
Earnings per share:
Basic	$ 0.97	$ 0.66	$ 1.80	$ 1.05
Diluted	$ 0.96	$ 0.66	$ 1.79	$ 1.04
Additional Disclosure
Employee stock awards excluded from computation of diluted earnings per share	0	0	0	0