LEASES - Other Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Weighted-average remaining lease term (years)
Operating leases	7 years 8 months 4 days		7 years 10 months 28 days
Finance leases	2 years 14 days		2 years 3 months 3 days
Weighted-average discount rate
Operating leases	7.90%		7.90%
Finance leases	6.10%		6.20%
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows for operating leases	$ 12,740	$ 12,673
Operating cash flows for finance leases	9	9
Financing cash flows for finance leases	$ 57	$ 52

Lessee Operating and Finance Lease Weighted Average Discount Rate [Abstract]

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Lessee Operating and Finance Lease Weighted Average Remaining Lease Term [Abstract]

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Amount of cash outflow for principal payment on finance lease.

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Weighted average discount rate for finance lease calculated at point in time.

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Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for 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 cash outflow for variable lease payment excluded from lease liability.

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