LEASES - Cash flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating leases
Noncash change in operating right-of-use assets	$ 24,023	$ 21,184	$ 20,439
Change in operating lease liabilities	(23,400)	(20,428)	(19,711)
Operating right-of-use assets and lease liabilities, net	623	756	728
Cash paid for amounts included in the measurement of operating lease liabilities	$ (25,909)	$ (23,810)	$ (21,714)