Employee Benefit Plans (Details) (USD $)	3 Months Ended	6 Months Ended
Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Weighted average assumptions used to determine net periodic benefit cost [Abstract]
Contributions to noncontributory defined benefit plan			$ 540,000
Expected contributions to nonconributory defined benefit plan for the remainder of the year	540,000		540,000
Pension Benefits [Member]
Components of Net Periodic Benefit Cost
Service cost	236,000	243,000	499,000	505,000
Interest cost	283,000	331,000	584,000	651,000
Expected return on plan assets	(372,000)	(407,000)	(753,000)	(801,000)
Recognized net actuarial loss	115,000	160,000	266,000	314,000
Amortization of prior service cost	14,000	14,000	28,000	28,000
Net periodic benefit cost	276,000	341,000	624,000	697,000
Weighted average assumptions used to determine net periodic benefit cost [Abstract]
Discount rate (in hundredths)	3.89%	4.28%	3.89%	4.28%
Expected long-term return on plan assets (in hundredths)	5.75%	6.25%	5.75%	6.25%
Rate of compensation increase (in hundredths)	3.50%	4.00%	3.50%	4.00%
Other Benefits [Member]
Components of Net Periodic Benefit Cost
Service cost	53,000	34,000	106,000	73,000
Interest cost	69,000	57,000	139,000	115,000
Expected return on plan assets	(13,000)	0	(26,000)	0
Recognized net actuarial loss	22,000	8,000	43,000	17,000
Amortization of prior service cost	21,000	6,000	42,000	11,000
Net periodic benefit cost	$ 152,000	$ 105,000	$ 304,000	$ 216,000
Weighted average assumptions used to determine net periodic benefit cost [Abstract]
Discount rate (in hundredths)	4.00%	4.44%	3.97%	4.43%
Expected long-term return on plan assets (in hundredths)	0.00%	0.00%	0.00%	0.00%
Rate of compensation increase (in hundredths)	3.73%	3.44%	3.71%	3.46%

The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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

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An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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

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

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The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan in the current remaining fiscal period. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

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An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

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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 total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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Amount of net gain (loss) recognized in net periodic benefit cost due to settlements and curtailments. Curtailments result from 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. Settlements result from an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

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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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