EARNINGS PER SHARE - Computation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net income	$ 39,113	$ 41,781	$ 46,963	$ 41,063	$ 80,894	$ 88,026
Denominator:
Weighted average shares of common stock outstanding (in shares)	11,354		11,753		11,455	11,762
Effect of dilutive common stock equivalents (in shares)	81		105		79	107
Weighted average shares of common stock outstanding (in shares)	11,435		11,858		11,534	11,869
Basic earnings per share
Earnings per share - basic (in dollars per share)	$ 3.44		$ 4.00		$ 7.06	$ 7.48
Diluted earnings per share
Earnings per share - diluted (in dollars per share)	$ 3.42		$ 3.96		$ 7.01	$ 7.42