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Net Periodic Benefit Cost (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
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 $ 123,000 $ 114,000 $ 370,000 $ 342,000
Interest cost on projected benefit obligations 1,439,000 1,523,000 4,316,000 4,569,000
Expected return on plan assets (1,788,000) (1,741,000) (5,365,000) (5,223,000)
Net amortization and deferral 0 0 0 0
Recognition of actuarial losses/(gains) 1,945,000 1,916,000 5,837,000 5,748,000
Net periodic pension cost/(credit) 1,719,000 1,812,000 5,158,000 5,436,000
Net Periodic Benefit Cost (Textuals) [Abstract]        
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year     7,700,000  
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 4,364,000 3,481,000 12,991,000 10,707,000
Interest cost on projected benefit obligations 4,864,000 5,441,000 14,569,000 16,580,000
Expected return on plan assets (8,650,000) (7,962,000) (25,912,000) (24,337,000)
Net amortization and deferral (991,000) (335,000) (2,965,000) (1,045,000)
Recognition of actuarial losses/(gains) 1,842,000 622,000 5,511,000 1,844,000
Net periodic pension cost/(credit) 1,429,000 1,247,000 4,194,000 3,749,000
Net Periodic Benefit Cost (Textuals) [Abstract]        
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year     23,600,000  
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 54,000 83,000 162,000 249,000
Interest cost on projected benefit obligations 101,000 135,000 303,000 405,000
Expected return on plan assets 0 0 0 0
Net amortization and deferral 22,000 0 65,000 0
Recognition of actuarial losses/(gains) (247,000) (188,000) (741,000) (564,000)
Net periodic pension cost/(credit) (70,000) 30,000 (211,000) 90,000
Net Periodic Benefit Cost (Textuals) [Abstract]        
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year     $ 1,100,000