Employee Benefits (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012 plan	Jul. 02, 2011	Jun. 30, 2012 plan	Jul. 02, 2011
Employee Benefits
Number of defined benefit plans	2		2
Components of net periodic benefit cost:
Service cost	$ 2,210	$ 1,805	$ 4,436	$ 3,732
Interest cost	2,177	2,249	4,435	4,543
Expected return on plan assets	(1,617)	(1,684)	(3,209)	(3,319)
Amortization and other	1,567	992	3,097	2,043
Settlement	1,796		1,796
Net periodic benefit cost	$ 6,133	$ 3,362	$ 10,555	$ 6,999

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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+ Details

- Definition

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.

+ References+ Details

- Definition

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.

+ References

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+ Details

- Definition

The amount of decrease that relates to 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 (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts.

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+ Details