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Net Periodic Benefit Cost (Details) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2011
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$ 83,000$ 66,000$ 248,000$ 198,000 
Interest cost on projected benefit obligations1,606,0001,610,0004,817,0004,829,000 
Expected return on plan assets(1,875,000)(1,727,000)(5,624,000)(5,180,000) 
Net amortization and deferral0000 
Recognition of actuarial losses/(gains)1,276,0001,324,0003,827,0003,973,000 
Recognition of settlement/curtailment losses, net  00 
Net periodic pension cost/(credit)1,090,0001,273,0003,268,0003,820,000 
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, net3,746,0003,055,00010,693,0009,323,000 
Interest cost on projected benefit obligations6,472,0005,592,00018,667,00016,563,000 
Expected return on plan assets(9,118,000)(7,379,000)(25,970,000)(21,588,000) 
Net amortization and deferral(404,000)(324,000)(1,130,000)(932,000) 
Recognition of actuarial losses/(gains)288,000266,000864,000796,000 
Recognition of settlement/curtailment losses, net  058,000 
Net periodic pension cost/(credit)984,0001,210,0003,124,0004,220,000 
Net Periodic Benefit Cost (Textuals) [Abstract]     
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year    19,100,000
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, net76,00074,000228,000221,000 
Interest cost on projected benefit obligations183,000189,000548,000568,000 
Expected return on plan assets0000 
Net amortization and deferral0(168,000)(519,000)(503,000) 
Recognition of actuarial losses/(gains)(173,000)(184,000)0(552,000) 
Recognition of settlement/curtailment losses, net  00 
Net periodic pension cost/(credit)86,000(89,000)257,000(266,000) 
Net Periodic Benefit Cost (Textuals) [Abstract]     
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year    $ 1,400,000