LEASES - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Leases [Abstract]
Operating lease costs	$ 2,410		$ 7,021
Finance lease cost - amortization of right-of-use assets	53		159
Finance lease cost - interest on lease liabilities	15		49
Short-term lease cost	36		140
Variable lease cost	838		2,492
Sublease income	186	$ 200	557	$ 600
Total lease cost	$ 3,166		$ 9,304
Weighted average remaining lease term:
Operating leases	6 years 4 months 20 days		6 years 4 months 20 days
Finance leases	3 years 11 months 4 days		3 years 11 months 4 days
Weighted average discount rate:
Operating leases	6.52%		6.52%
Finance leases	6.24%		6.24%

Amount of interest expense on finance lease liability.

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Amount of amortization expense attributable to right-of-use asset from 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 lease cost recognized by lessee for lease contract.

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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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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 short-term lease cost, excluding expense for lease with term of one month or less.

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Amount of sublease income excluding finance and operating lease expense.

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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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Leases, Weighted Average Discount Rate [Abstract]

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Weighted Average Remaining Lease Term [Abstract]

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