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Retirement Plans and Postretirement Medical Benefits (Pension Plans with an Accumulated Benefit Obligation in Excess of Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 399,000 | $ 427,000
United States |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | 1,689,476 | 1,867,788
Accumulated benefit obligation | 1,688,573 | 1,866,525
Fair value of plan assets | 1,460,111 | 1,592,774
Foreign |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | 540,984 | 583,317
Accumulated benefit obligation | 529,593 | 566,365
Fair value of plan assets | $ 412,418 | $ 437,209

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