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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Income Taxes [Abstract] |  |
Accounts receivable | $ 542 | $ 586
Compensated absences | 848 | 1,076
Employment incentives | 388 | 9,826
Employee benefit plans | 5,581 | 9,243
General liability insurance | 2,991 | 4,359
Postretirement benefit obligations | 5,365 | 6,484
Net operating loss carryforwards | 7,745 | 5,600
Other | 4,373 | 2,224
Total deferred tax assets | 27,833 | 39,398
Inventories | (8,026) | (7,619)
Unrealized gains on marketable securities | (2,310) | (3,382)
Nondeductible accruals and other | (5,160) | (7,517)
Depreciation | (99,759) | (140,325)
Total deferred tax liabilities | (115,255) | (158,843)
Net deferred tax liability | $ (87,422) | $ (119,445)

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