LEASES - Other Lease Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Weighted-average remaining lease term (years)
Operating leases	7 years 5 months 12 days		7 years 10 months 28 days
Finance leases	1 year 9 months 29 days		2 years 3 months 3 days
Weighted-average discount rate
Operating leases	7.90%		7.90%
Finance leases	6.10%		6.20%
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows for operating leases	$ 25,479	$ 25,347
Operating cash flows for finance leases	16	19
Financing cash flows for finance leases	$ 119	$ 113