EARNINGS PER SHARE - Computation of Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
EARNINGS PER SHARE
Net income	$ 13,111	$ 3,597
Denominator:
Denominator for basic earnings per share - weighted average shares	8,831	8,841
Effect of dilutive securities:
Employee restricted stock and incentive stock options	212	166
Denominator for diluted earnings per share - adjusted weighted average shares and assumed conversion (in shares)	9,043	9,007
Basic earnings per share (in dollars per share)	$ 1.48	$ 0.41
Diluted earnings per share (in dollars per share)	$ 1.45	$ 0.40
Weighted average anti-dilutive employee restricted stock and incentive stock options (in shares)	74	234