INCOME TAXES - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Activity related to unrecognized tax benefits
Gross unrecognized tax benefits at the beginning of the period	$ 33,878	$ 32,682	$ 30,232
Decrease in unrecognized tax benefits taken during a prior period	(216)
Increase in unrecognized tax benefits taken during the current period	3,880	2,964	3,383
Increase in unrecognized tax benefits acquired as part of a business combination	8,275
Lapse in statute of limitations	(2,103)	(1,768)	(933)
Gross unrecognized tax benefits at the end of the period	43,714	33,878	32,682
Interest and penalties accrued	$ 7,600	$ 6,900	$ 5,900