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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 29, 2012 | Dec. 31, 2011
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Income Taxes [Abstract] |  |
Accounts receivable | $ 426 | $ 403
Compensated absences | 510 | 495
Long term employment incentives | 2,891 | 1,554
Employee benefit plans | 3,784 | 3,496
General liability insurance | 1,113 | 1,074
Postretirement benefit obligations | 6,255 | 5,931
Net operating loss carryforwards | 6,535 | 6,825
Total deferred tax assets | 21,514 | 19,778
Inventories | (6,241) | (5,511)
Unrealized gains on marketable securities | (3,506) | (3,799)
Nondeductible accruals and other | (1,995) | (1,021)
Depreciation | (102,301) | (86,658)
Total deferred tax liabilities | (114,043) | (96,989)
Net deferred tax liability | (92,529) | (77,211)
Current deferred tax liability - net | (3,420) | (4,130)
Noncurrent deferred tax liability - net | $ (89,109) | $ (73,081)

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