Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance			$ (131,327)
Other comprehensive income before reclassifications			21,193
Tax effect			(896)
Other comprehensive income before reclassifications, net of tax			20,297
Amounts reclassified out of AOCI			8,065
Tax effect of reclassification			(2,617)
Amounts reclassified out of AOCI, net of tax			5,448
Other comprehensive income (loss)	$ 10,826	$ 5,714	25,745	$ (52,046)
Ending Balance	(105,582)		(105,582)
Unrealized Gain (Loss) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance			498
Other comprehensive income before reclassifications			2,560
Tax effect			(896)
Other comprehensive income before reclassifications, net of tax			1,664
Amounts reclassified out of AOCI			0
Tax effect of reclassification			0
Amounts reclassified out of AOCI, net of tax			0
Other comprehensive income (loss)			1,664
Ending Balance	2,162		2,162
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance			4,597
Other comprehensive income before reclassifications			18,633
Tax effect			0
Other comprehensive income before reclassifications, net of tax			18,633
Amounts reclassified out of AOCI			0
Tax effect of reclassification			0
Amounts reclassified out of AOCI, net of tax			0
Other comprehensive income (loss)			18,633
Ending Balance	23,230		23,230
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			8,065
Tax effect of reclassification			(2,617)
Amounts reclassified out of AOCI, net of tax			5,448
Other comprehensive income (loss)			5,448
Ending Balance	$ (130,974)		$ (130,974)