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Pension Benefits (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Components of net periodic pension cost relating to the Benefit Plans
Service cost	$ 8,829	$ 8,345	$ 9,753
Interest cost	5,167	5,148	4,548
Expected return on plan assets	(5,805)	(5,431)	(4,624)
Amortization of net actuarial loss	371	281	1,394
Other	421	(3,390)	184
Net cost	$ 9,215	$ 5,167	$ 11,255

X

- Definition

The amount of gains or losses recognized in net periodic benefit cost.

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X

- Definition

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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- 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.

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- Definition

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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- Definition

This element may be used to encapsulate any other periodic costs associated with defined benefit plans that are not separately disclosed.

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No definition available.

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- 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.

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