LEASES - Other Lease Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Weighted-average remaining lease term (years)
Operating leases	8 years 1 month 6 days		8 years 9 months 21 days
Finance leases	2 years 5 months 4 days		3 years
Weighted-average discount rate
Operating leases	8.90%		8.90%
Finance leases	6.10%		6.10%
Operating cash flows for operating leases	$ 38,018	$ 42,816
Operating cash flows for finance leases	26	37
Financing cash flows for finance leases	175	373
Acquisition of operating leases though adoption of ASC 842	0	389,403
Lease modification	$ 0	$ (48,877)