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Pension Benefits (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Pension plans with benefit obligations and accumulated benefit obligations in excess of plan assets    
Benefit obligation $ 113,460 $ 72,180
Fair value of plan assets 85,432 53,421
Accumulated benefit obligation 35,358 62,405
Fair value of plan assets $ 31,815 $ 39,134