Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Foreign Pension Plans, Defined Benefit [Member]
Net periodic benefit cost [Abstract]
Service Cost	$ 1,037	$ 735
Interest Cost	2,097	2,131
Expected return on plan assets	(1,890)	(2,014)
Amortization of:
Prior service cost (income)	30	30
Recognized actuarial (gain) loss	120	64
Transition obligation	(12)	(11)
Other	51	32
Net periodic benefit cost	1,433	967
United States Pension Plans of US Entity, Defined Benefit [Member]
Net periodic benefit cost [Abstract]
Service Cost	3,601	3,542
Interest Cost	6,284	6,809
Expected return on plan assets	(9,745)	(9,618)
Amortization of:
Prior service cost (income)	263	326
Recognized actuarial (gain) loss	3,379	2,084
Transition obligation	0	0
Other	0	0
Net periodic benefit cost	3,782	3,143
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Net periodic benefit cost [Abstract]
Service Cost	1,326	1,016
Interest Cost	1,979	1,960
Expected return on plan assets	0	0
Amortization of:
Prior service cost (income)	1,856	1,816
Recognized actuarial (gain) loss	35	0
Transition obligation	0	0
Other	0	0
Net periodic benefit cost	5,196	4,792
Post-Retirement Benefits [Member]
Net periodic benefit cost [Abstract]
Service Cost	62	52
Interest Cost	148	181
Expected return on plan assets	0	0
Amortization of:
Prior service cost (income)	(104)	(102)
Recognized actuarial (gain) loss	(5)	(60)
Transition obligation	0	0
Other	0	0
Net periodic benefit cost	$ 101	$ 71