Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 04, 2015	Mar. 29, 2014
Accumulated other comprehensive income (loss) [Roll Forward]
Balance at January 1, 2015	$ (11,523)
Unrealized losses	(2,183)	(974)
Amounts reclassified from accumulated other comprehensive income (loss)	390
Tax effect	(148)
Net of tax amount	(1,941)
Balance at April 4, 2015	(13,464)
Foreign currencty translation adjustments [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Balance at January 1, 2015	(1,151)
Unrealized losses	(2,183)
Amounts reclassified from accumulated other comprehensive income (loss)	0
Tax effect	0
Net of tax amount	(2,183)
Balance at April 4, 2015	(3,334)
Accumulated defined benefit plans adjustment [member]
Accumulated other comprehensive income (loss) [Roll Forward]
Balance at January 1, 2015	(10,372)
Unrealized losses	0
Amounts reclassified from accumulated other comprehensive income (loss)	390
Tax effect	(148)
Net of tax amount	242
Balance at April 4, 2015	$ (10,130)