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Income Taxes (Tables) | 12 Months Ended
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Dec. 26, 2015
Income Taxes [Abstract] |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
(dollars in thousands) |  | 2015 |  | 2014 |  | 2013
Current: |  |  |  |  |  |
Federal | $ | 29,888 | $ | 24,809 | $ | 26,994
State |  | 3,325 |  | 1,237 |  | 6,774
Deferred: |  |  |  |  |  |
Federal |  | (188) |  | 2,559 |  | 8,973
State |  | (24) |  | 676 |  | 2,429
| $ | 33,001 | $ | 29,281 | $ | 45,170
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
(dollars in thousands) |  | 2015 |  | 2014 |  | 2013
Income taxes at federal statutory rate | $ | 32,316 | $ | 29,282 | $ | 41,425
State income taxes, net of federal income tax benefit |  | 1,112 |  | 1,436 |  | 5,981
Other |  | (427) |  | (1,437) |  | (2,236)
Provision for income taxes (effective tax rate 35.7%, 35.0% and 38.2%, respectively) | $ | 33,001 | $ | 29,281 | $ | 45,170
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
(dollars in thousands) |  | 2015 |  | 2014
Deferred tax assets: |  |  |  |
Accounts receivable | $ | 813 | $ | 615
Compensated absences |  | 983 |  | 362
Long term employment incentives |  | 3,143 |  | 1,161
Employee benefit plans |  | 10,485 |  | 10,734
General liability insurance |  | 4,048 |  | 3,655
Postretirement benefit obligations |  | 5,906 |  | 7,676
Net operating loss carryforwards |  | 5,926 |  | 6,218
Other |  | 2,173 |  | 1,359
Total deferred tax assets |  | 33,477 |  | 31,780
Deferred tax liabilities: |  |  |  |
Inventories |  | (6,808) |  | (7,459)
Unrealized gains on marketable securities |  | (3,323) |  | (3,371)
Nondeductible accruals and other |  | (9,240) |  | (6,522)
Depreciation |  | (111,126) |  | (111,708)
Total deferred tax liabilities |  | (130,497) |  | (129,060)
Net deferred tax liability | $ | (97,020) | $ | (97,280)
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
(dollars in thousands) |  | 2015 |  | 2014
Unrecognized tax benefits at beginning of year | $ | - | $ | -
Increases based on tax positions related to the current year |  | 1,264 |  | -
Additions for tax positions of prior year |  | - |  | -
Reductions for tax positions of prior years |  | - |  | -
Settlements |  | - |  | -
Expiration of the statute of limitations for assessment of taxes |  | - |  | -
Unrecognized tax benefits at end of year | $ | 1,264 | $ | -

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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