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PENSION AND OTHER POSTRETIREMENT BENEFITS (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
PENSIONS AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	$ 244,302	$ 193,389
U.S. equity securities
PENSIONS AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	128,766	99,840
Non-U.S. equity securities
PENSIONS AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	25,461	18,565
Fixed income funds and cash investment funds
PENSIONS AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	90,075	74,984
Level 1
PENSIONS AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	244,302	193,389
Level 1 \| U.S. equity securities
PENSIONS AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	128,766	99,840
Level 1 \| Non-U.S. equity securities
PENSIONS AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	25,461	18,565
Level 1 \| Fixed income funds and cash investment funds
PENSIONS AND OTHER POSTRETIREMENT BENEFITS
Fair value of pension plan investments	$ 90,075	$ 74,984

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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