LEASES - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Operating lease costs	$ 7,239	$ 7,518
Variable lease costs	1,276	1,493
Finance lease costs:
Amortization of right-of-use assets	117	108
Interest on lease liabilities	78	81
Total lease cost	$ 8,710	$ 9,200