Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
Accumulated Other Comprehensive Income
Beginning Balance			$ (69,140)
Other comprehensive income before reclassifications			(61,871)
Tax effect			362
Other comprehensive income before reclassifications, net of tax			(61,509)
Amounts reclassified out of AOCI			5,694
Tax effect			(1,945)
Amounts reclassified out of AOCI, net of tax			3,749
Net other comprehensive income	$ 16,599	$ (5,462)	(57,760)	$ (4,391)
Ending Balance	(126,900)		(126,900)
Unrealized Gain (Loss) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income
Beginning Balance			1,917
Other comprehensive income before reclassifications			(1,035)
Tax effect			362
Other comprehensive income before reclassifications, net of tax			(673)
Amounts reclassified out of AOCI			(680)
Tax effect			238
Amounts reclassified out of AOCI, net of tax			(442)
Net other comprehensive income			(1,115)
Ending Balance	802		802
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income
Beginning Balance			84,703
Other comprehensive income before reclassifications			(60,836)
Tax effect			0
Other comprehensive income before reclassifications, net of tax			(60,836)
Amounts reclassified out of AOCI			0
Tax effect			0
Amounts reclassified out of AOCI, net of tax			0
Net other comprehensive income			(60,836)
Ending Balance	23,867		23,867
Pension and Other Post-Retirement Actuarial Items [Member]
Accumulated Other Comprehensive Income
Beginning Balance			(155,760)
Other comprehensive income before reclassifications			0
Tax effect			0
Other comprehensive income before reclassifications, net of tax			0
Amounts reclassified out of AOCI			6,374
Tax effect			(2,183)
Amounts reclassified out of AOCI, net of tax			4,191
Net other comprehensive income			4,191
Ending Balance	(151,569)		(151,569)
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	$ 0		$ 680