Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net periodic benefit cost [Abstract]
Total amount amortized out of accumulated other comprehensive income	$ 8,110	$ 0
Foreign Pension Plans, Defined Benefit [Member]
Net periodic benefit cost [Abstract]
Service Cost	1,471	1,037
Interest Cost	2,261	2,097
Expected return on plan assets	(2,393)	(1,890)
Prior service cost (income)	29	30
Recognized actuarial (gain) loss	373	120
Transition obligation	(3)	(12)
Other	40	51
Net periodic benefit cost	1,778	1,433
U.S. Pension Plans, Defined Benefit [Member]
Net periodic benefit cost [Abstract]
Service Cost	4,601	3,601
Interest Cost	6,122	6,284
Expected return on plan assets	(9,953)	(9,745)
Prior service cost (income)	257	263
Recognized actuarial (gain) loss	5,485	3,379
Transition obligation	0	0
Other	0	0
Net periodic benefit cost	6,512	3,782
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Net periodic benefit cost [Abstract]
Service Cost	1,679	1,326
Interest Cost	1,773	1,979
Prior service cost (income)	1,997	1,856
Recognized actuarial (gain) loss	42	35
Net periodic benefit cost	5,491	5,196
Post-Retirement Benefits [Member]
Net periodic benefit cost [Abstract]
Service Cost	58	62
Interest Cost	131	148
Prior service cost (income)	(104)	(104)
Recognized actuarial (gain) loss	34	(5)
Net periodic benefit cost	$ 119	$ 101