Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Accumulated Other Comprehensive Income
Beginning Balance			$ 61,634
Other comprehensive income before reclassifications			(63,775)
Tax effect			(209)
Other comprehensive income before reclassifications, net of tax			(63,984)
Amounts reclassified out of AOCI			21,986
Tax effect			(7,572)
Amounts reclassified out of AOCI, net of tax			14,414
Net other comprehensive income	(45,179)	28,113	(49,570)	19,400
Ending Balance	12,064		12,064
Unrealized Gain (Loss) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income
Beginning Balance			554
Other comprehensive income before reclassifications			1,775
Tax effect			(621)
Other comprehensive income before reclassifications, net of tax			1,154
Amounts reclassified out of AOCI			(24)
Tax effect			8
Amounts reclassified out of AOCI, net of tax			(16)
Net other comprehensive income			1,138
Ending Balance	1,692		1,692
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income
Beginning Balance			190,998
Other comprehensive income before reclassifications			(64,373)
Tax effect			0
Other comprehensive income before reclassifications, net of tax			(64,373)
Amounts reclassified out of AOCI			0
Tax effect			0
Amounts reclassified out of AOCI, net of tax			0
Net other comprehensive income			(64,373)
Ending Balance	126,625		126,625
Pension and Other Post-Retirement Actuarial Items [Member]
Accumulated Other Comprehensive Income
Beginning Balance			(129,918)
Other comprehensive income before reclassifications			(1,177)
Tax effect			412
Other comprehensive income before reclassifications, net of tax			(765)
Amounts reclassified out of AOCI			22,010
Tax effect			(7,580)
Amounts reclassified out of AOCI, net of tax			14,430
Net other comprehensive income			13,665
Ending Balance	(116,253)		(116,253)
Rabbi Trust Assets [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Component of Selling, General, and Administrative Expense	$ 24