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Net Periodic Benefit Cost (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Components of Net periodic pension cost for the Company's defined benefit pension plans and U.S. post-retirement medical plan        
Service cost, net $ 4,122,000 $ 4,541,000 $ 12,539,000 $ 13,523,000
Interest cost on projected benefit obligations 7,039,000 6,404,000 21,360,000 19,188,000
Expected return on plan assets (11,509,000) (10,438,000) (34,923,000) (31,277,000)
Net amortization and deferral (1,204,000) (969,000) (3,664,000) (2,900,000)
Recognition of actuarial losses/(gains) 1,923,000 3,540,000 5,795,000 10,607,000
Net periodic pension cost/(credit) 371,000 3,078,000 1,107,000 9,141,000
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 223,000 123,000 669,000 370,000
Interest cost on projected benefit obligations 1,599,000 1,439,000 4,797,000 4,316,000
Expected return on plan assets (2,137,000) (1,788,000) (6,411,000) (5,365,000)
Net amortization and deferral 0 0 0 0
Recognition of actuarial losses/(gains) 1,200,000 1,945,000 3,600,000 5,837,000
Net periodic pension cost/(credit) 885,000 1,719,000 2,655,000 5,158,000
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 3,856,000 4,364,000 11,741,000 12,991,000
Interest cost on projected benefit obligations 5,380,000 4,864,000 16,383,000 14,569,000
Expected return on plan assets (9,372,000) (8,650,000) (28,512,000) (25,912,000)
Net amortization and deferral (1,009,000) (991,000) (3,079,000) (2,965,000)
Recognition of actuarial losses/(gains) 1,082,000 1,842,000 3,272,000 5,511,000
Net periodic pension cost/(credit) (63,000) 1,429,000 (195,000) 4,194,000
Net Periodic Benefit Cost (Textuals) [Abstract]        
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year     21,800,000  
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 43,000 54,000 129,000 162,000
Interest cost on projected benefit obligations 60,000 101,000 180,000 303,000
Expected return on plan assets 0 0 0 0
Net amortization and deferral (195,000) 22,000 (585,000) 65,000
Recognition of actuarial losses/(gains) (359,000) (247,000) (1,077,000) (741,000)
Net periodic pension cost/(credit) (451,000) (70,000) (1,353,000) (211,000)
Net Periodic Benefit Cost (Textuals) [Abstract]        
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year     $ 500,000