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Pension, Postretirement and Postemployment Benefits (Details 2) (Pension Benefits, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension, Postretirement and Postemployment Benefits
Fair Value of Plan assets	$ 18,780	$ 16,352	$ 15,219
Cash
Pension, Postretirement and Postemployment Benefits
Fair Value of Plan assets	520
Available-for-sale equity securities
Pension, Postretirement and Postemployment Benefits
Fair Value of Plan assets	10,361
Available-for-sale debt securities
Pension, Postretirement and Postemployment Benefits
Fair Value of Plan assets	7,899
Short-term Investments
Pension, Postretirement and Postemployment Benefits
Fair Value of Plan assets	18,260
Level 2
Pension, Postretirement and Postemployment Benefits
Fair Value of Plan assets	18,780
Level 2 \| Cash
Pension, Postretirement and Postemployment Benefits
Fair Value of Plan assets	520
Level 2 \| Available-for-sale equity securities
Pension, Postretirement and Postemployment Benefits
Fair Value of Plan assets	10,361
Level 2 \| Available-for-sale debt securities
Pension, Postretirement and Postemployment Benefits
Fair Value of Plan assets	7,899
Level 2 \| Short-term Investments
Pension, Postretirement and Postemployment Benefits
Fair Value of Plan assets	$ 18,260

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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