LEASES (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating Leases [Abstract]
Operating lease cost	$ 3,800	$ 3,900	$ 11,400	$ 11,400
Operating cash flow information [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities	3,972	3,894	11,009	11,537
Non-cash activity [Abstract]
Lease liabilities arising from obtaining right-of-use assets	$ 1,220	$ 6,311	$ 4,421	$ 15,092
Weighted Average Remaining Lease Term and Discount Rate [Abstract]
Weighted-average remaining lease term	5 years 5 months 26 days	6 years 3 months 14 days	5 years 5 months 26 days	6 years 3 months 14 days
Weighted-average discount rate	10.77%	11.38%	10.77%	11.38%
Maturities of Lease Liabilities [Abstract]
2021 (excluding the nine months ended September 30, 2021)	$ 3,938		$ 3,938
2022	15,926		15,926
2023	14,981		14,981
2024	13,413		13,413
2025	11,399		11,399
2026	3,241		3,241
Thereafter	15,441		15,441
Total lease payments	78,339		78,339
Less: imputed interest	(18,890)		(18,890)
Present value of lease liabilities	$ 59,449		$ 59,449
Minimum [Member]
Operating Leases [Abstract]
Remaining lease term	1 year		1 year
Maximum [Member]
Operating Leases [Abstract]
Remaining lease term	11 years		11 years
Variable lease cost	$ 100		$ 100

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Amount of lessee's undiscounted obligation for lease payment for operating lease due after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payment for operating lease having initial or remaining lease term in excess of one year to be paid in remainder of current fiscal year.

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Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.

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Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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