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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 27, 2017 | Dec. 28, 2016
--- | --- | ---
Deferred tax assets: |  |
Self-insurance accruals | $ 4,364 | $ 7,791
Capitalized leases | 1,718 | 2,298
Accrued exit cost | 487 | 1,074
Interest rate swaps | 566 | 294
Pension, other retirement and compensation plans | 10,328 | 12,378
Other accruals | 443 | 386
Alternative minimum tax credit carryforwards | 3,534 | 3,534
General business credit carryforwards - state and federal | 13,355 | 13,541
Net operating loss carryforwards - state | 14,096 | 11,753
Total deferred tax assets before valuation allowance | 48,891 | 53,049
Less: valuation allowance | (13,078) | (12,567)
Total deferred tax assets | 35,813 | 40,482
Deferred tax liabilities: |  |
Intangible assets | (14,578) | (22,073)
Deferred finance costs | (111) | (125)
Fixed assets | (4,179) | (601)
Total deferred tax liabilities | (18,868) | (22,799)
Net deferred tax asset | $ 16,945 | $ 17,683

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