PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Unrecognized Benefit Amounts) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Pension Benefits
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Net actuarial loss, beginning of period			$ 95,522	$ 58,239
Amortization			(954)	(751)
Curtailment and settlement adjustments	$ (837)	$ 0
Actuarial loss (gain)			(28,552)	28,806
Asset loss (gain)			(10,109)	16,438
Currency translation loss (gain)			776	(202)
Net actuarial loss, end of period	55,846	102,530	55,846	102,530
Other Benefits
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Net actuarial loss, beginning of period			174	91
Amortization			(1)	0
Curtailment and settlement adjustments	0	0
Actuarial loss (gain)			(35)	64
Asset loss (gain)			0	0
Currency translation loss (gain)			0	0
Net actuarial loss, end of period	$ 138	$ 155	$ 138	$ 155

Other Comprehensive Income (Loss), Defined Benefit Plan, Foreign Currency Translation Gain (Loss), after Tax

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount, after tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, after tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, after tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount, after tax, of increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan.

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Amount, after tax, of reclassification adjustment from accumulated other comprehensive income (loss) for transition asset (obligation) of defined benefit plan.

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