LEASES - Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 49,061	$ 50,169
Variable lease cost	10,575	9,691
Short-term lease cost	0	182
Total lease cost	$ 59,636	$ 60,042