LEASES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating Leases [Abstract]
Operating lease cost	$ 3,900	$ 3,600	$ 11,400	$ 10,900
Variable lease cost	0		600
Rental payments withheld or deferred	600		600
Recognition of negative lease expense	100		600
Operating cash flow information [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities	3,894	3,674	11,537	11,277
Non-cash activity [Abstract]
Lease liabilities arising from obtaining right-of-use assets	6,311	$ 2,811	15,092	$ 51,445
Lease re-measurements	$ 15,000		$ 15,000
Weighted Average Remaining Lease Term and Discount Rate [Abstract]
Weighted-average remaining lease term	6 years 3 months 14 days	5 years 9 months	6 years 3 months 14 days	5 years 9 months
Weighted-average discount rate	11.38%	14.34%	11.38%	14.34%
Maturities of Lease Liabilities [Abstract]
2020 (excluding the nine months ended September 30, 2020)	$ 3,860		$ 3,860
2021	14,791		14,791
2022	14,838		14,838
2023	13,526		13,526
2024	12,305		12,305
2025	10,748		10,748
Thereafter	18,381		18,381
Total lease payments	88,449		88,449
Less: imputed interest	(24,887)		(24,887)
Present value of lease liabilities	$ 63,562		$ 63,562
Minimum [Member]
Operating Leases [Abstract]
Remaining lease term	1 year		1 year
Maximum [Member]
Operating Leases [Abstract]
Remaining lease term	11 years		11 years