Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net periodic benefit cost [Abstract]
Total amount amortized out of accumulated other comprehensive income	$ 8,101	$ 0	$ 16,211	$ 0
Foreign Pension Plans, Defined Benefit [Member]
Net periodic benefit cost [Abstract]
Service Cost	1,445	1,031	2,916	2,068
Interest Cost	2,223	2,100	4,484	4,197
Expected return on plan assets	(2,350)	(1,898)	(4,743)	(3,788)
Prior service cost (income)	28	29	57	59
Recognized actuarial (gain) loss	366	121	739	241
Transition obligation	(4)	(11)	(7)	(23)
Other	39	51	79	102
Net periodic benefit cost	1,747	1,423	3,525	2,856
U.S. Pension Plans, Defined Benefit [Member]
Net periodic benefit cost [Abstract]
Service Cost	4,601	3,601	9,202	7,202
Interest Cost	6,122	6,284	12,244	12,568
Expected return on plan assets	(9,952)	(9,745)	(19,905)	(19,490)
Prior service cost (income)	256	263	513	526
Recognized actuarial (gain) loss	5,485	3,379	10,970	6,758
Transition obligation	0	0	0	0
Other	0	0	0	0
Net periodic benefit cost	6,512	3,782	13,024	7,564
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Net periodic benefit cost [Abstract]
Service Cost	1,679	1,326	3,358	2,652
Interest Cost	1,774	1,979	3,547	3,958
Prior service cost (income)	1,998	1,856	3,995	3,712
Recognized actuarial (gain) loss	42	35	84	70
Net periodic benefit cost	5,493	5,196	10,984	10,392
Post-Retirement Benefits [Member]
Net periodic benefit cost [Abstract]
Service Cost	59	62	117	124
Interest Cost	131	148	262	296
Prior service cost (income)	(104)	(104)	(208)	(208)
Recognized actuarial (gain) loss	34	(5)	68	(10)
Settlement gain	0	(1,493)	0	(1,493)
Net periodic benefit cost	$ 120	$ (1,392)	$ 239	$ (1,291)