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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Policies)
9 Months Ended
Sep. 30, 2011
Pension and Other Postretirement Benefit Plans [Abstract] 
Pension and Other Postretirement Plans, Pensions, Policy
We estimate the fair value of pension plan assets based upon the information available during the year-end reporting process. In some cases, primarily private equity funds, the information available consists of net asset values as of an interim date, cash flows between the interim date and the end of the year and market events. When the differences are significant, we revise the year-end estimated fair value of pension plan assets to incorporate year-end net asset values reflected in audited financial statements received after we have filed our annual report on Form 10-K.