EARNINGS PER SHARE - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net earnings (basic)	$ 10,962	$ 6,278
Net earnings (diluted)	$ 10,962	$ 6,278
Denominator:
Weighted-average shares outstanding (basic) (in shares)	12,038,638	12,575,630
Effect of dilutive securities:
Common stock equivalent shares from stock options (in shares)	139,138
Weighted-average shares outstanding (diluted) (in shares)	12,177,776	12,575,630
Net earnings per share
Basic (in USD per share)	$ 0.91	$ 0.50
Diluted (in USD per share)	$ 0.90	$ 0.50