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PENSION AND OTHER POSTRETIREMENT BENEFITS (Details 2) (Pension Benefits, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
PENSION AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	$ 193,389	$ 159,231	$ 152,015
U.S. equity securities
PENSION AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	99,840	79,773
Non-U.S. equity securities
PENSION AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	18,565	14,282
Debt securities, fixed income funds and cash investment funds
PENSION AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	74,984	65,176
Level 1
PENSION AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	193,389	159,231
Level 1 \| U.S. equity securities
PENSION AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	99,840	79,773
Level 1 \| Non-U.S. equity securities
PENSION AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	18,565	14,282
Level 1 \| Debt securities, fixed income funds and cash investment funds
PENSION AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	$ 74,984	$ 65,176

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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