LEASES (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2020 USD ($) Lease	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Operating Leases [Abstract]
Operating lease cost		$ 15,300	$ 14,500
Variable lease cost		600	2,900
Rental payments withheld or deferred		500
Recognition of negative lease expense		600
Operating cash flow information [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities		15,390	12,926
Non-cash activity [Abstract]
Lease liabilities arising from obtaining right-of-use assets	[1]	$ 14,890	$ 63,911
Number of lease modifications | Lease		4
Weighted Average Remaining Lease Term and Discount Rate [Abstract]
Weighted-average remaining lease term		6 years 1 month 10 days	6 years 2 months 19 days
Weighted-average discount rate		11.33%	12.86%
Maturities of Lease Liabilities [Abstract]
2021		$ 14,705
2022		14,750
2023		13,451
2024		12,306
2025		10,748
Thereafter		18,380
Total lease payments		84,340
Less: imputed interest		(23,133)
Present value of lease liabilities		$ 61,207		$ 5,600
Minimum [Member]
Operating Leases [Abstract]
Remaining lease term		1 year
Maximum [Member]
Operating Leases [Abstract]
Remaining lease term		11 years

[1] Includes effect of adoption of ASU 2016-02 and related amendments and a new lease entered into on January 1, 2019 of $5.6 million.