SIGNIFICANT ACCOUNTING POLICIES - AOCI (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2015	Mar. 30, 2014
Changes in accumulated other comprehensive loss
Balance at the beginning of the period	$ (416,603)
Other comprehensive income (loss) before reclassifications	(247)
Amounts reclassified from AOCL	2,881
Other comprehensive income (loss)	2,634	2,607
Balance at the end of the period	(413,969)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Compensation	106,672	108,552
Provision for income taxes	(7,653)	(12,424)
Net of tax	11,346	15,842
Minimum Pension and Post-Retirement Liability
Changes in accumulated other comprehensive loss
Balance at the beginning of the period	(407,552)
Amounts reclassified from AOCL	2,881
Other comprehensive income (loss)	2,881
Balance at the end of the period	(404,671)
Minimum Pension and Post-Retirement Liability | Amount Reclassified from AOCI
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Compensation	4,802	3,136
Provision for income taxes	(1,921)	(1,254)
Net of tax	2,881	1,882
Other Comprehensive Loss Related to Equity Investments
Changes in accumulated other comprehensive loss
Balance at the beginning of the period	(9,051)
Other comprehensive income (loss) before reclassifications	(247)
Other comprehensive income (loss)	(247)
Balance at the end of the period	$ (9,298)