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 (Loss) [Roll Forward]
Balance as of December 31, 2013	$ (67)
Other comprehensive income before reclassifications	(73)
Amounts reclassified from accumulated OCI	2
Net other comprehensive income (loss)	(71)	(113)
Balance as of March 29, 2014	(138)
Investments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2013	(35)
Other comprehensive income before reclassifications	(13)
Amounts reclassified from accumulated OCI	0
Net other comprehensive income (loss)	(13)
Balance as of March 29, 2014	(48)
Post Retirement Obligations
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2013	(72)
Other comprehensive income before reclassifications	0
Amounts reclassified from accumulated OCI	2
Net other comprehensive income (loss)	2
Balance as of March 29, 2014	(70)
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2013	40
Amounts reclassified from accumulated OCI	(60)
Net other comprehensive income (loss)	(60)
Balance as of March 29, 2014	$ (20)