NET INCOME PER COMMON SHARE - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net income	$ 41,502	$ 40,541	$ 91,472	$ 92,228
Adjustment for Basic EPS:
Earnings allocated to unvested shareholders	(235)	(247)	(557)	(602)
Adjusted net income	$ 41,267	$ 40,294	$ 90,915	$ 91,626
Denominator:
Weighted average common shares outstanding – Basic	47,393,830	47,299,627	47,381,864	47,284,773
Effect of dilutive shares:
Common stock equivalents arising from stock options and ESPP	894	204	1,085	369
Restricted stock awards and units and performance units	63,168	57,033	68,405	62,454
Weighted average common shares outstanding – Diluted	47,457,892	47,356,864	47,451,354	47,347,596
Basic	$ 0.87	$ 0.85	$ 1.92	$ 1.94
Diluted	$ 0.87	$ 0.85	$ 1.92	$ 1.94