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Income Taxes (Tables) | 12 Months Ended
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Dec. 29, 2012
Income Taxes [Abstract] |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | The provision (benefit) for income taxes consists of:
(dollars in thousands) |  | 2012 |  | 2011 |  | 2010 |
Current: |  |  |  |  |  |  |
Federal | $ | 30,258 | $ | 24,518 | $ | 1,578 |
State |  | 2,534 |  | 781 |  | (679 | )
Deferred: |  |  |  |  |  |  |
Federal |  | 12,107 |  | 12,731 |  | 33,612 |
State |  | 3,504 |  | 3,992 |  | 4,583 |
| $ | 48,403 | $ | 42,022 | $ | 39,094 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | The reconciliation of income taxes computed at the federal statutory rate (35% in 2012, 2011 and 2010) to the provision for income taxes is:
(dollars in thousands) |  | 2012 |  |  | 2011 |  |  | 2010 |
Income taxes at federal statutory rate | $ | 45,820 |  | $ | 41,151 |  | $ | 37,585 |
State income taxes, net of federal income tax benefit |  | 3,925 |  |  | 2,558 |  |  | 2,538 |
Other |  | (1,342 | ) |  | (1,687 | ) |  | (1,029 | )
Provision for income taxes (effective tax rate 37.0%, 35.7% and 36.4%, respectively) | $ | 48,403 |  | $ | 42,022 |  | $ | 39,094 |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | The tax effects of temporary differences that give rise to deferred tax assets and deferred tax liabilities at December 29, 2012 and December 31, 2011, are:
(dollars in thousands) |  | 2012 |  |  | 2011 |
Deferred tax assets: |  |  |  |  |  |
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 |
Deferred tax liabilities: |  |  |  |  |  |
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 liability - net | $ | (3,420 | ) | $ | (4,130 | )
Noncurrent deferred liability - net |  | (89,109 | ) |  | (73,081 | )
Net deferred tax liability | $ | (92,529 | ) | $ | (77,211 | )
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] | The following table summarizes the activity related to the Company's unrecognized tax benefits:
(dollars in thousands) |  | 2012 | 2011 |
Unrecognized tax benefits at beginning of year | $ | 161 | 925 |
Increases based on tax positions related to the current year |  | --- | --- |
Additions for tax positions of prior year |  | 64 | --- |
Reductions for tax positions of prior years |  | --- | --- |
Settlements |  | --- | (764 | )
Expiration of the statute of limitations for assessment of taxes |  | --- | --- |
Unrecognized tax benefits at end of year | $ | 225 | 161 |

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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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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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