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Retirement Plans (Funded Status of Retirement Income Plan) (Details) (USD $) In Thousands, unless otherwise specified		3 Months Ended		12 Months Ended
	Apr. 05, 2013	Mar. 31, 2013 Retirement Income Plan [Member]	Mar. 31, 2012 Retirement Income Plan [Member]	Dec. 31, 2012 Retirement Income Plan [Member]
Enhanced company contribtion to the Retirement Savings Plan	4.00%
Change In Benefit Obligation [Abstract]
Benefit Obligation, beginning of year		$ 302,647	$ 254,009	$ 254,009
Service cost		2,449	2,154	8,091
Interest cost		3,303	3,230	12,981
Actuarial (gain) losses		(11,485)		33,596
Benefits paid		(1,598)		(6,030)
Impact of curtailment		(29,603)		0
Benefit Obligation, end of year		265,713		302,647
Change In Fair Value Of Assets Abstract
Fair Value of assets, beggining fo year		207,150	182,614	182,614
Actual return on plan assets, net of expenses		6,760		21,896
Contributions by the employer to funded plans		2,650		8,550
Contributions by the employer to unfunded plans		30		120
Benefits paid fair value		(1,598)		(6,030)
Fair value of assets, end of period		214,992		207,150
Funded Status		(50,721)		(95,497)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Liabilities		(50,721)		(95,497)
Net pension liability, end of period		(50,721)		(95,497)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Prior serrvice cost		0		26
Net actuarial loss		57,543		103,365
Total		57,543		103,391
Accumulated benefit obligation		$ 257,412		$ 265,899
Weighted-Average Assumptions [Abstract]
Discount Rate		4.66%		4.42%
Rate of Compensation Increase		4.00%		4.00%

X

- Definition

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.

+ References

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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 decrease to plan assets.

+ References

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The increase in the fair value of plan assets from contributions made by the employer to qualified, funded plans.

+ References

No definition available.

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The increase in the fair value of plan assets from contributions made by the employer to non-qualified, unfunded plans.

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Maximum percentage of an employee's contribution to the Retirement Savings Plan that the employer will match.

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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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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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- Definition

The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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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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The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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The interest rate used to adjust for the time value of money for the plan.

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Expected rate of compensation increases (for pay-related plans).

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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.

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The amount of decrease that is related to an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

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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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