LEASES - Supplemental Lease Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Weighted-average remaining lease term (years)	9 years 2 months 12 days	5 years 1 month 6 days
Weighted-average discount rate	1.85%	2.56%
Cash paid for amounts included in the measurement of lease liabilities:	$ 15,976	$ 9,910
Operating cash flows from operating leases (lease liability reduction)	14,056	10,244
Operating lease right-of-use assets obtained in exchange for leases entered into during the year, net of business combinations	$ 54,107	$ 5,826