LEASES - Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
LEASES
Operating lease expense	$ 26,552	$ 24,559	$ 22,291
Variable lease expense	4,128	3,152	3,366
Sublease income	(626)	(398)	(324)
Total operating lease expense	$ 30,054	$ 27,313	$ 25,333