PENSION PLANS - Components of Pension Cost (Details) - USD ($) $ in Thousands  | 
3 Months Ended | |
|---|---|---|
Mar. 31, 2018  | 
Apr. 01, 2017  | 
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| Retirement Benefits [Abstract] | ||
| Service cost – benefits earned during the period | $ 5,912 | $ 6,416 | 
| Interest cost on projected benefit obligations | 14,825 | 14,815 | 
| Expected return on plan assets | (25,314) | (23,355) | 
| Amortization of deferred amounts: | ||
| Net deferred actuarial losses | 8,548 | 11,382 | 
| Deferred prior service costs | 647 | 712 | 
| Net periodic pension cost | $ 4,618 | $ 9,970 | 
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- References No definition available. 
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Defined Benefit Plan, Amortization of Deferred Amounts [Abstract] No definition available. 
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