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Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Components of Net periodic pension cost for the Company's defined benefit pension plans and U.S. post-retirement medical plan        
Service cost, net $ 4,983 $ 4,122 $ 14,856 $ 12,539
Interest cost on projected benefit obligations 5,196 7,039 15,550 21,360
Expected return on plan assets (11,623) (11,509) (35,050) (34,923)
Net amortization and deferral (2,144) (1,204) (5,040) (3,664)
Recognition of actuarial losses/(gains) 4,819 1,923 14,585 5,795
Net periodic pension cost/(credit) 1,231 371 4,901 1,107
United States Pension Plans of US Entity, Defined Benefit [Member]        
Components of Net periodic pension cost for the Company's defined benefit pension plans and U.S. post-retirement medical plan        
Service cost, net 211 223 628 669
Interest cost on projected benefit obligations 1,607 1,599 4,823 4,797
Expected return on plan assets (2,395) (2,137) (7,183) (6,411)
Net amortization and deferral 0 0 0 0
Recognition of actuarial losses/(gains) 1,906 1,200 5,720 3,600
Net periodic pension cost/(credit) 1,329 885 3,988 2,655
Foreign Pension Plans, Defined Benefit [Member]        
Components of Net periodic pension cost for the Company's defined benefit pension plans and U.S. post-retirement medical plan        
Service cost, net 4,772 3,856 14,228 11,741
Interest cost on projected benefit obligations 3,554 5,380 10,623 16,383
Expected return on plan assets (9,228) (9,372) (27,867) (28,512)
Net amortization and deferral (1,675) (1,009) (3,632) (3,079)
Recognition of actuarial losses/(gains) 3,756 1,082 11,393 3,272
Net periodic pension cost/(credit) 1,179 (63) 4,745 (195)
Net Periodic Benefit Cost (Textuals) [Abstract]        
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year     19,600  
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]        
Components of Net periodic pension cost for the Company's defined benefit pension plans and U.S. post-retirement medical plan        
Service cost, net 0 43 0 129
Interest cost on projected benefit obligations 35 60 104 180
Expected return on plan assets 0 0 0 0
Net amortization and deferral (469) (195) (1,408) (585)
Recognition of actuarial losses/(gains) (843) (359) (2,528) (1,077)
Net periodic pension cost/(credit) $ (1,277) $ (451) (3,832) $ (1,353)
Net Periodic Benefit Cost (Textuals) [Abstract]        
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year     $ 700