Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance			$ (131,327)
Other comprehensive income before reclassifications			12,119
Tax effect			(725)
Other comprehensive income before reclassifications, net of tax			11,394
Amounts reclassified out of AOCI			5,371
Tax effect of reclassification			(1,846)
Amounts reclassified out of AOCI, net of tax			3,525
Other comprehensive income (loss)	$ (20,108)	$ 16,599	14,919	$ (57,760)
Ending Balance	(116,408)		(116,408)
Unrealized Gain (Loss) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance			498
Other comprehensive income before reclassifications			2,071
Tax effect			(725)
Other comprehensive income before reclassifications, net of tax			1,346
Amounts reclassified out of AOCI			0
Tax effect of reclassification			0
Amounts reclassified out of AOCI, net of tax			0
Other comprehensive income (loss)			1,346
Ending Balance	1,844		1,844
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance			4,597
Other comprehensive income before reclassifications			10,048
Tax effect			0
Other comprehensive income before reclassifications, net of tax			10,048
Amounts reclassified out of AOCI			0
Tax effect of reclassification			0
Amounts reclassified out of AOCI, net of tax			0
Other comprehensive income (loss)			10,048
Ending Balance	14,645		14,645
Pension and Other Post-Retirement Actuarial Items [Member]
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance			(136,422)
Other comprehensive income before reclassifications			0
Tax effect			0
Other comprehensive income before reclassifications, net of tax			0
Amounts reclassified out of AOCI			5,371
Tax effect of reclassification			(1,846)
Amounts reclassified out of AOCI, net of tax			3,525
Other comprehensive income (loss)			3,525
Ending Balance	$ (132,897)		$ (132,897)