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Marketable Securities (Maturities of Marketable Securities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 29, 2012 | Dec. 31, 2011
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Marketable Securities [Abstract] |  |
Amortized Cost, Due within one year | $ 4,078 |
Fair Value, Due within one year | 3,933 |
Amortized Cost, Due after one year through five years | 49,607 |
Fair Value, Due after one year through five years | 49,255 |
Amortized Cost, Due after five years through ten years | 17,655 |
Fair Value, Due after five years through ten years | 18,963 |
Amortized Cost, Due after ten years | 1,500 |
Fair Value, Due after ten years | 1,500 |
Amortized Cost, Equity securities | 1,136 |
Fair Value, Equity securities | 8,850 |
Available-for-sale Securities, Amortized Cost Basis, Total | 73,976 | 80,101
Available-for-sale Securities, Fair Value, Total | $ 82,501 | $ 89,348

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