Net Periodic Benefit Cost (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 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
Interest cost on projected benefit obligations	1,439,000	1,523,000
Expected return on plan assets	(1,788,000)	(1,741,000)
Net amortization and deferral	0	0
Recognition of actuarial losses/(gains)	1,945,000	1,916,000
Net periodic pension cost/(credit)	1,719,000	1,812,000
Net Periodic Benefit Cost (Textuals) [Abstract]
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	3,100,000
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	4,369,000	3,638,000
Interest cost on projected benefit obligations	4,883,000	5,605,000
Expected return on plan assets	(8,692,000)	(8,234,000)
Net amortization and deferral	(994,000)	(357,000)
Recognition of actuarial losses/(gains)	1,846,000	613,000
Net periodic pension cost/(credit)	1,412,000	1,265,000
Net Periodic Benefit Cost (Textuals) [Abstract]
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	22,500,000
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
Interest cost on projected benefit obligations	101,000	135,000
Expected return on plan assets	0	0
Net amortization and deferral	22,000	0
Recognition of actuarial losses/(gains)	(247,000)	(188,000)
Net periodic pension cost/(credit)	(70,000)	30,000
Net Periodic Benefit Cost (Textuals) [Abstract]
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	$ 1,000,000