Net Periodic Benefit Cost (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 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	$ 4,189,000	$ 4,434,000	$ 8,416,000	$ 8,982,000
Interest cost on projected benefit obligations	7,178,000	6,362,000	14,320,000	12,785,000
Expected return on plan assets	(11,733,000)	(10,358,000)	(23,414,000)	(20,838,000)
Net amortization and deferral	(1,225,000)	(957,000)	(2,459,000)	(1,930,000)
Recognition of actuarial losses/(gains)	1,942,000	3,521,000	3,888,000	7,066,000
Net periodic pension cost/(credit)	351,000	3,002,000	751,000	6,065,000
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	446,000	247,000
Interest cost on projected benefit obligations	1,599,000	1,439,000	3,198,000	2,878,000
Expected return on plan assets	(2,137,000)	(1,788,000)	(4,274,000)	(3,576,000)
Net amortization and deferral	0	0	0	0
Recognition of actuarial losses/(gains)	1,200,000	1,945,000	2,400,000	3,891,000
Net periodic pension cost/(credit)	885,000	1,719,000	1,770,000	3,440,000
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	3,923,000	4,257,000	7,885,000	8,627,000
Interest cost on projected benefit obligations	5,519,000	4,822,000	11,002,000	9,705,000
Expected return on plan assets	(9,596,000)	(8,570,000)	(19,140,000)	(17,262,000)
Net amortization and deferral	(1,030,000)	(979,000)	(2,070,000)	(1,973,000)
Recognition of actuarial losses/(gains)	1,100,000	1,823,000	2,206,000	3,669,000
Net periodic pension cost/(credit)	(84,000)	1,353,000	(117,000)	2,766,000
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	85,000	108,000
Interest cost on projected benefit obligations	60,000	101,000	120,000	202,000
Expected return on plan assets	0	0	0	0
Net amortization and deferral	(195,000)	22,000	(389,000)	43,000
Recognition of actuarial losses/(gains)	(358,000)	(247,000)	(718,000)	(494,000)
Net periodic pension cost/(credit)	(450,000)	(70,000)	(902,000)	(141,000)
Net Periodic Benefit Cost (Textuals) [Abstract]
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year			$ 500,000