Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Foreign Pension Plans, Defined Benefit [Member]
Net periodic benefit cost [Abstract]
Service Cost	$ 1,031	$ 758	$ 2,068	$ 1,493
Interest Cost	2,100	2,182	4,197	4,313
Expected return on plan assets	(1,898)	(2,063)	(3,788)	(4,077)
Prior service cost (income)	29	33	59	63
Recognized actuarial (gain) loss	121	64	241	128
Transition obligation	(11)	(11)	(23)	(22)
Other	51	32	102	64
Net periodic benefit cost	1,423	995	2,856	1,962
U.S. Pension Plans, Defined Benefit [Member]
Net periodic benefit cost [Abstract]
Service Cost	3,601	3,542	7,202	7,084
Interest Cost	6,284	6,809	12,568	13,618
Expected return on plan assets	(9,745)	(9,618)	(19,490)	(19,236)
Prior service cost (income)	263	326	526	652
Recognized actuarial (gain) loss	3,379	2,084	6,758	4,168
Transition obligation	0	0	0	0
Other	0	0	0	0
Net periodic benefit cost	3,782	3,143	7,564	6,286
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Net periodic benefit cost [Abstract]
Service Cost	1,326	1,016	2,652	2,032
Interest Cost	1,979	1,960	3,958	3,920
Prior service cost (income)	1,856	1,816	3,712	3,632
Recognized actuarial (gain) loss	35	0	70	0
Net periodic benefit cost	5,196	4,792	10,392	9,584
Post-Retirement Benefits [Member]
Net periodic benefit cost [Abstract]
Service Cost	62	51	124	103
Interest Cost	148	181	296	362
Prior service cost (income)	(104)	(103)	(208)	(205)
Recognized actuarial (gain) loss	(5)	(60)	(10)	(120)
Settlement gain	(1,493)	0	(1,493)	0
Net periodic benefit cost	$ (1,392)	$ 69	$ (1,291)	$ 140