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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 28, 2013 | Dec. 29, 2012
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Income Taxes [Abstract] |  |
Accounts receivable | $ 585 | $ 426
Compensated absences | 403 | 510
Long term employment incentives | 2,785 | 2,891
Employee benefit plans | 4,221 | 3,784
General liability insurance | 1,223 | 1,113
Postretirement benefit obligations | 7,037 | 6,255
Net operating loss carryforwards | 5,736 | 6,535
Total deferred tax assets | 21,990 | 21,514
Inventories | (6,809) | (6,241)
Unrealized gains on marketable securities | (2,753) | (3,506)
Nondeductible accruals and other | (4,745) | (1,995)
Depreciation | (109,836) | (102,301)
Total deferred tax liabilities | (124,143) | (114,043)
Net deferred tax liability | (102,153) | (92,529)
Current deferred tax liability - net | (4,219) | (3,420)
Noncurrent deferred tax liability - net | $ (97,934) | $ (89,109)

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- Definition The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from employee benefit costs not otherwise specified in the taxonomy, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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