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Fair Value Measurements and Other-Than-Temporary Impairments - Roll-Forward of Amortized Cost, Cumulative OTTI Recognized in Earnings and Accumulated Other Comprehensive Loss (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 28, 2014
Dec. 28, 2013
Jun. 29, 2013
OTTI Recognized in Earnings and Accumulated Other Comprehensive Loss [Member]
Amortized Cost      
Amortized Cost, Beginning balance $ 297,880 $ 296,972 $ 2,707
Amortized Cost, Call on investments     (87)
Amortized Cost, Investments sold     (2,620)
Amortized Cost, Ending balance 297,880 296,972 0
Cumulative OTTI in Earnings      
Cumulative OTTI in Earnings, Beginning balance     (394)
Cumulative OTTI in Earnings, Call on investments     13
Cumulative OTTI in Earnings, Investments sold     381
Cumulative OTTI in Earnings, Ending balance     0
Unrealized Gain      
Unrealized Gain, Beginning balance     784
Unrealized Gain, Call on investments     (25)
Unrealized Gain, Investments Sold     (759)
Unrealized Gain, Ending balance     0
OTTI Loss in Accumulated Other Comprehensive Loss      
OTTI Loss in Accumulated Other Comprehensive Loss, Beginning balance     (618)
OTTI Loss in Accumulated Other Comprehensive Loss, Call on investments     20
OTTI Loss in Accumulated Other Comprehensive Loss, Investments sold     598
OTTI Loss in Accumulated Other Comprehensive Loss, Ending balance     0
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss), Beginning balance     166
Accumulated Other Comprehensive Income (Loss), Call on investments     (5)
Accumulated Other Comprehensive Income (Loss), Investments sold     (161)
Accumulated Other Comprehensive Income (Loss), Ending balance     $ 0