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PENSION AND OTHER POSTRETIREMENT BENEFITS (Details 2) (Pension Benefits, USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
PENSION AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	$ 159,231	$ 152,015	$ 128,331
U.S. equity securities
PENSION AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	79,773	83,050
Non-U.S. equity securities
PENSION AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	14,282	14,561
Debt securities, fixed income funds and cash investment funds
PENSION AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	65,176	54,404
Level 1
PENSION AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	159,231	152,015
Level 1 \| U.S. equity securities
PENSION AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	79,773	83,050
Level 1 \| Non-U.S. equity securities
PENSION AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	14,282	14,561
Level 1 \| Debt securities, fixed income funds and cash investment funds
PENSION AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	$ 65,176	$ 54,404

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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