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Employee Benefits Plans (Details 5) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Summary of pension obligations greater than fair value of related plan assets    
Accumulated benefit obligations $ 2,165,855 $ 1,929,979
Plans with ABO in excess of plan assets:    
PBO 1,869,643 1,966,671
ABO 1,828,078 1,929,065
Fair value of plan assets 1,269,059 1,416,870
Plans with PBO in excess of plan assets:    
PBO 1,869,643 1,966,671
ABO 1,828,258 1,929,065
Fair value of plan assets 1,269,059 1,416,870
U.S. Plans [Member]
   
Summary of pension obligations greater than fair value of related plan assets    
Accumulated benefit obligations 1,747,610 1,551,211
Plans with ABO in excess of plan assets:    
PBO 1,786,025 1,586,341
ABO 1,747,610 1,551,211
Fair value of plan assets 1,202,565 1,063,386
Plans with PBO in excess of plan assets:    
PBO 1,786,025 1,586,341
ABO 1,747,610 1,551,211
Fair value of plan assets 1,202,565 1,063,386
Foreign Plans [Member]
   
Summary of pension obligations greater than fair value of related plan assets    
Accumulated benefit obligations 418,245 378,768
Plans with ABO in excess of plan assets:    
PBO 83,618 380,330
ABO 80,468 377,854
Fair value of plan assets 66,494 353,484
Plans with PBO in excess of plan assets:    
PBO 83,618 380,330
ABO 80,648 377,854
Fair value of plan assets $ 66,494 $ 353,484