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Earnings Per Share (Policies)
9 Months Ended
Sep. 30, 2011
Earnings Per Share [Abstract] 
Earnings Per Share, Policy [Policy Text Block]
Unvested performance stock units and related dividend equivalent rights are not included in the computation of dilutive securities because vesting of these instruments is dependent upon three-year performance periods and the vesting criteria have not been met as of the end of the reporting period presented.