Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Accumulated Other Comprehensive Income
Beginning Balance	$ 61,634
Other comprehensive income before reclassifications	(148)
Tax effect	(284)
Other comprehensive income before reclassifications, net of tax	(432)
Amounts reclassified out of AOCI	2,244
Tax effect	(741)
Amounts reclassified out of AOCI, net of tax	1,503
Net comprehensive income	1,071	(21,460)
Ending Balance	62,705
Unrealized Gain (Loss) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income
Beginning Balance	554
Other comprehensive income before reclassifications	812
Tax effect	(284)
Other comprehensive income before reclassifications, net of tax	528
Amounts reclassified out of AOCI	0
Tax effect	0
Amounts reclassified out of AOCI, net of tax	0
Net comprehensive income	528
Ending Balance	1,082
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income
Beginning Balance	190,998
Other comprehensive income before reclassifications	(960)
Tax effect	0
Other comprehensive income before reclassifications, net of tax	(960)
Amounts reclassified out of AOCI	0
Tax effect	0
Amounts reclassified out of AOCI, net of tax	0
Net comprehensive income	(960)
Ending Balance	190,038
Pension and Other Post-Retirement Actuarial Items [Member]
Accumulated Other Comprehensive Income
Beginning Balance	(129,918)
Other comprehensive income before reclassifications	0
Tax effect	0
Other comprehensive income before reclassifications, net of tax	0
Amounts reclassified out of AOCI	2,244
Tax effect	(741)
Amounts reclassified out of AOCI, net of tax	1,503
Net comprehensive income	1,503
Ending Balance	$ (128,415)