LEASES - Other Lease Information (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Weighted-average remaining lease term (years)
Operating leases	9 years 6 months 11 days
Finance leases	2 years 22 days
Weighted-average discount rate
Operating leases	9.90%
Finance leases	5.50%
Operating cash flows for operating leases	$ 29,033
Operating cash flows for finance leases	26
Financing cash flows for finance leases	250
Acquisition of operating leases through adoption of ASC 842	$ 389,403