Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Foreign Pension Plans, Defined Benefit [Member]
Net periodic benefit cost [Abstract]
Service Cost	$ 1,079	$ 763	$ 3,147	$ 2,256
Interest Cost	2,231	2,176	6,428	6,489
Expected return on plan assets	(2,022)	(2,073)	(5,810)	(6,150)
Prior service cost (income)	30	30	89	93
Recognized actuarial (gain) loss	130	65	371	193
Transition obligation	(13)	(11)	(36)	(33)
Other	56	33	158	97
Net periodic benefit cost	1,491	983	4,347	2,945
U.S. Pension Plans, Defined Benefit [Member]
Net periodic benefit cost [Abstract]
Service Cost	3,602	3,541	10,804	10,625
Interest Cost	6,284	6,809	18,852	20,427
Expected return on plan assets	(9,744)	(9,618)	(29,234)	(28,854)
Prior service cost (income)	260	327	786	979
Recognized actuarial (gain) loss	3,378	2,083	10,136	6,251
Transition obligation	0	0	0	0
Other	0	0	0	0
Net periodic benefit cost	3,780	3,142	11,344	9,428
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Net periodic benefit cost [Abstract]
Service Cost	1,326	1,016	3,978	3,048
Interest Cost	1,979	1,961	5,937	5,881
Prior service cost (income)	1,857	1,817	5,569	5,449
Recognized actuarial (gain) loss	33	0	103	0
Net periodic benefit cost	5,195	4,794	15,587	14,378
Post-Retirement Benefits [Member]
Net periodic benefit cost [Abstract]
Service Cost	62	52	186	155
Interest Cost	149	181	445	543
Prior service cost (income)	(104)	(102)	(312)	(307)
Recognized actuarial (gain) loss	(5)	(61)	(15)	(181)
Settlement gain	0	0	(1,493)	0
Net periodic benefit cost	$ 102	$ 70	$ (1,189)	$ 210