Marketable Securities (Maturities of Marketable Securities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Marketable Securities [Abstract]
Amortized Cost, Due within one year	$ 2,304
Fair Value, Due within one year	2,221
Amortized Cost, Due after one year through five years	39,678
Fair Value, Due after one year through five years	39,470
Amortized Cost, Due after five years through ten years	13,449
Fair Value, Due after five years through ten years	13,193
Amortized Cost, Equity securities	970
Fair Value, Equity securities	8,209
Available-for-sale Securities, Amortized Cost Basis, Total	56,401	73,976
Available-for-sale Securities, Fair Value, Total	$ 63,093	$ 82,501