Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ (94,652)
Other comprehensive income before reclassifications	17,711
Tax effect	(147)
Other comprehensive income before reclassifications, net of tax	17,564
Amounts reclassified out of AOCI	3,299
Tax effect of reclassification	(964)
Amounts reclassified out of AOCI, net of tax	2,335
Other comprehensive income (loss)	19,899	$ 35,027
Ending Balance	(74,753)
Unrealized Gain (Loss) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	1,110
Other comprehensive income before reclassifications	418
Tax effect	(147)
Other comprehensive income before reclassifications, net of tax	271
Amounts reclassified out of AOCI	0
Tax effect of reclassification	0
Amounts reclassified out of AOCI, net of tax	0
Other comprehensive income (loss)	271
Ending Balance	1,381
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(31,266)
Other comprehensive income before reclassifications	17,293
Tax effect	0
Other comprehensive income before reclassifications, net of tax	17,293
Amounts reclassified out of AOCI	0
Tax effect of reclassification	0
Amounts reclassified out of AOCI, net of tax	0
Other comprehensive income (loss)	17,293
Ending Balance	(13,973)
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	3,299
Tax effect of reclassification	(964)
Amounts reclassified out of AOCI, net of tax	2,335
Other comprehensive income (loss)	2,335
Ending Balance	$ (62,161)