Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014
Accumulated Other Comprehensive Income
Beginning Balance			$ (69,140)
Other comprehensive income before reclassifications			(58,598)
Tax effect			498
Other comprehensive income before reclassifications, net of tax			(58,100)
Amounts reclassified out of AOCI			8,868
Tax effect			(2,814)
Amounts reclassified out of AOCI, net of tax			6,054
Net other comprehensive income	$ 5,714	$ (45,179)	(52,046)	$ (49,570)
Ending Balance	(121,186)		(121,186)
Unrealized Gain (Loss) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income
Beginning Balance			1,917
Other comprehensive income before reclassifications			(1,424)
Tax effect			498
Other comprehensive income before reclassifications, net of tax			(926)
Amounts reclassified out of AOCI			(680)
Tax effect			238
Amounts reclassified out of AOCI, net of tax			(442)
Net other comprehensive income			(1,368)
Ending Balance	549		549
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income
Beginning Balance			84,703
Other comprehensive income before reclassifications			(57,174)
Tax effect			0
Other comprehensive income before reclassifications, net of tax			(57,174)
Amounts reclassified out of AOCI			0
Tax effect			0
Amounts reclassified out of AOCI, net of tax			0
Net other comprehensive income			(57,174)
Ending Balance	27,529		27,529
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			9,548
Tax effect			(3,052)
Amounts reclassified out of AOCI, net of tax			6,496
Net other comprehensive income			6,496
Ending Balance	(149,264)		(149,264)
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