Employee Benefit Plans (Change in Benefit Obligation and Plan Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 26, 2012	Dec. 28, 2011	Dec. 29, 2010
Pension Plan [Member]
Change in Benefit Obligation
Benefit obligation at begninning of year	$ 70,468	$ 63,125
Service cost	380	335	375
Interest cost	3,200	3,364	3,431
Actuarial losses	4,575	7,160
Benefits paid	(4,697)	(3,516)
Benefit obligation at end of year	73,926	70,468	63,125
Accumulated benefit obligation	73,926	70,468
Change in Plan Assets
Fair value of plan assets at beginning of year	53,270	53,580
Actual return on plan assets	6,666	1,341
Employer contributions	2,767	1,865
Benefits paid	(4,697)	(3,516)
Fair value of plan assets at end of year	58,006	53,270	53,580
Funded status	(15,920)	(17,198)
Other Defined Benefit Plans [Member]
Change in Benefit Obligation
Benefit obligation at begninning of year	2,689	2,493
Service cost	0	0
Interest cost	116	127	138
Actuarial losses	227	264
Benefits paid	(195)	(195)
Benefit obligation at end of year	2,837	2,689	2,493
Accumulated benefit obligation	2,837	2,689
Change in Plan Assets
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	195	195
Benefits paid	(195)	(195)
Fair value of plan assets at end of year	0	0	0
Funded status	$ (2,837)	$ (2,689)

For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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-Name Accounting Standards Codification

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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Amount of gain (loss) from a decision to temporarily deviate from the substantive plan, or from a change in benefit obligation or plan asset value from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover or salary scale.

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

+ References

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-Glossary Accumulated Postretirement Benefit Obligation

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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-Glossary Postretirement Benefits

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The increase in the fair value of plan assets from contributions made by the employer.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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