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Accumulated Other Comprehensive Loss
12 Months Ended
Dec. 31, 2011
Accumulated Other Comprehensive Loss

O.    Accumulated Other Comprehensive Loss

Accumulated other comprehensive loss represents amounts of unrecognized actuarial losses related to the Company sponsored defined benefit pension plan and post-retirement medical plan, net of tax effect. Changes in accumulated other comprehensive loss represent actuarial losses or gains, net of tax effect, recognized as components of net periodic benefit costs.