Fair Value Measurements and Other-Than-Temporary Impairments - Reconciliation of All Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) (ARS [Member], Fair Value, Measurements, Recurring [Member], Level 3 [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012		Sep. 28, 2013		Sep. 29, 2012
ARS [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 2,796		$ 2,873		$ 7,675
Total Net Gains Included in Other Comprehensive Income	83	[1]	0		143	[1]
Calls	0	[2]	(92)	[3]	(4,939)	[2]
Sold			(2,781)	[4]
Ending balance	$ 2,879		$ 0		$ 2,879

[1] Amount represents the change in the non-credit loss related other-than-temporary impairments (“OTTI”) recorded in Accumulated other comprehensive loss in the accompanying condensed consolidated balance sheets.

[2] Amount represents the fair market value of the securities called. Realized gains on these calls for the nine months ended September 29, 2012 were $0.5 million.

[3] Amount represents the fair market value of the securities called at par value. Realized gains for the nine months ended September 28, 2013 were not significant.

[4] Amount represents the fair market value of the securities sold at 95% par value. Realized gains for the nine months ended September 28, 2013 were $0.2 million.