LEASES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Mar. 01, 2019
Lessee, Lease, Description [Line Items]
Renewal term	10 years
Weighted average remaining lease term	5 years 1 month 6 days
Weighted average discount rate (as a Percentage)	10.00%
Operating lease, liability	$ 442,515
Current lease liabilities	112,005
Right-of-use assets	350,579
Sublease income	$ 42,300	$ 45,500	$ 49,000
Lease term	12 months
JV Framework Agreement
Lessee, Lease, Description [Line Items]
Lease term				1 year
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	15 years