Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 27, 2014
Accumulated other comprehensive income (loss) [Roll Forward]
Balance at January 1, 2014	$ (4,393)
Unrealized losses	(1,266)
Amounts reclassified from accumulated other comprehensive income (loss)	541
Tax effect	(205)
Net of tax amount	(930)
Balance at September 27, 2014	(5,323)
Accumulated defined benefit plans adjustment [member]
Accumulated other comprehensive income (loss) [Roll Forward]
Balance at January 1, 2014	(6,040)
Unrealized losses	0
Amounts reclassified from accumulated other comprehensive income (loss)	541
Tax effect	(205)
Net of tax amount	336
Balance at September 27, 2014	(5,704)
Foreign currencty translation adjustments [Member]
Accumulated other comprehensive income (loss) [Roll Forward]
Balance at January 1, 2014	1,647
Unrealized losses	(1,266)
Amounts reclassified from accumulated other comprehensive income (loss)	0
Tax effect	0
Net of tax amount	(1,266)
Balance at September 27, 2014	$ 381