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PENSIONS AND OTHER BENEFITS - Components of amounts recognized in accumulated other comprehensive income, before tax effect (Details) (Components of amounts recognized in accumulated other comprehensive income, before tax effect, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components of amounts recognized in accumulated other comprehensive income, before tax effect
Unrecognized gain (loss)		$ 924	$ (711)

- Definition

Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

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