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INCOME TAXES - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 23, 2020	Sep. 25, 2019	Sep. 23, 2020	Sep. 25, 2019
Income Tax Disclosure [Abstract]
Expected U.S. federal income taxes at statutory rate	$ (1,450)	$ 1,738	$ (6,725)	$ 5,492
Expected U.S. federal income taxes at statutory rate, percentage	21.00%	21.00%	21.00%	21.00%
State and local income taxes, net of federal benefit	$ (492)	$ 505	$ (2,192)	$ 1,746
State and local income taxes, net of federal benefit, percentage	7.10%	6.10%	6.80%	6.70%
Foreign withholding taxes	$ 504	$ 655	$ 712	$ 1,624
Foreign withholding taxes, percentage	(7.30%)	7.90%	(2.20%)	6.20%
Tax credits	$ (701)	$ (2,874)	$ (1,128)	$ (4,697)
Tax credits, percentage	10.10%	(34.70%)	3.50%	(18.00%)
Non-controlling interest	$ (11)	$ (346)	$ 411	$ (1,291)
Non-controlling interest, percentage	0.20%	(4.20%)	(1.30%)	(4.90%)
Tax effect of change in basis related to ASC 842 adoption	$ 0	$ 0	$ 0	$ 1,161
Tax effect of change in basis related to ASC 842 adoption, percent	0.00%	0.00%	0.00%	4.40%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	$ 1,221	$ (2,587)	$ 1,971	$ (3,847)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent	(17.70%)	(31.20%)	(6.20%)	(14.70%)
Other	$ 0	$ (82)	$ 17	$ (82)
Other, percentage	0.00%	(1.00%)	0.00%	(0.30%)
Income tax benefit	$ (797)	$ (3,144)	$ (6,802)	$ (47)
Effective income tax rate reconciliation (in percentage)	11.50%	(38.00%)	21.20%	(0.20%)
Effective Income Tax Rate Reconciliation, Return To Provision Adjustment, Amount	$ 132	$ (153)	$ 132	$ (153)
Effective Income Tax Rate Reconciliation, Return To Provision Adjustment, Percent	(1.90%)	(1.80%)	(0.40%)	(0.60%)
Additional Deferred Tax Asset Recognized, Accelerated Tax Depreciation Deductions			$ 446

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