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Employee Retirement And Other Post-Retirement Benefit Plans
3 Months Ended
Mar. 31, 2012
Employee Retirement And Other Post-Retirement Benefit Plans [Abstract]  
Employee Retirement And Other Post-Retirement Benefit Plans

8. EMPLOYEE RETIREMENT AND OTHER POST-RETIREMENT BENEFIT PLANS

The following tables present the components of net periodic pension and other post-retirement benefit costs charged to expense for the three months ended March 31 (in thousands):