Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance			$ (94,652)
Other comprehensive income before reclassifications			72,020
Tax effect			(422)
Other comprehensive income before reclassifications, net of tax			71,598
Amounts reclassified out of AOCI			5,072
Tax effect of reclassification			(1,521)
Amounts reclassified out of AOCI, net of tax			3,551
Other comprehensive income (loss)	$ 55,250	$ (20,108)	75,149	$ 14,919
Ending Balance	(19,503)		(19,503)
Unrealized Gain (Loss) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance			1,110
Other comprehensive income before reclassifications			1,204
Tax effect			(422)
Other comprehensive income before reclassifications, net of tax			782
Amounts reclassified out of AOCI			0
Tax effect of reclassification			0
Amounts reclassified out of AOCI, net of tax			0
Other comprehensive income (loss)			782
Ending Balance	1,892		1,892
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance			(31,266)
Other comprehensive income before reclassifications			70,816
Tax effect			0
Other comprehensive income before reclassifications, net of tax			70,816
Amounts reclassified out of AOCI			0
Tax effect of reclassification			0
Amounts reclassified out of AOCI, net of tax			0
Other comprehensive income (loss)			70,816
Ending Balance	39,550		39,550
Pension and Other Post-Retirement Actuarial Items [Member]
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance			(64,496)
Other comprehensive income before reclassifications			0
Tax effect			0
Other comprehensive income before reclassifications, net of tax			0
Amounts reclassified out of AOCI			5,072
Tax effect of reclassification			(1,521)
Amounts reclassified out of AOCI, net of tax			3,551
Other comprehensive income (loss)			3,551
Ending Balance	$ (60,945)		$ (60,945)