LEASES - Schedule of Lease Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating Rental expense	$ 40,961	$ 37,229	$ 38,400
Depreciation of finance leases	1,037	812
Interest on lease liabilities	468	498
Total finance lease cost	$ 1,505	$ 1,310