EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net income	$ 23,206	$ 20,045	$ 70,396	$ 47,521
Denominator:
Denominator for basic earnings per share	26,279	26,197	26,267	26,186
Dilutive effect of unvested employee stock awards	176	171	165	176
Denominator for diluted earnings per share	26,455	26,368	26,432	26,362
Earnings per share:
Basic	$ 0.88	$ 0.77	$ 2.68	$ 1.81
Diluted	$ 0.88	$ 0.76	$ 2.66	$ 1.80
Additional Disclosure
Employee stock awards excluded from computation of diluted earnings per share	0	0	0	0