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Operating Segments (Schedule Of Sales And Long-Lived Assets By Country) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Segment Reporting Information [Line Items]
Sales and Other Operating Revenues	$ 653,966	$ 672,420	$ 641,026	$ 479,465	$ 680,215	$ 688,208	$ 664,188	$ 538,916	$ 2,446,877	$ 2,571,527	$ 2,491,738
Long-Lived Assets	402,458				416,249				402,458	416,249	436,625
United States [Member]
Segment Reporting Information [Line Items]
Sales and Other Operating Revenues									315,610	340,313	305,390
Long-Lived Assets	75,330				88,910				75,330	88,910	100,698
Belgium [Member]
Segment Reporting Information [Line Items]
Sales and Other Operating Revenues									210,425	345,774	469,067
Germany [Member]
Segment Reporting Information [Line Items]
Sales and Other Operating Revenues									210,791	267,087	199,768
Brazil [Member]
Segment Reporting Information [Line Items]
Long-Lived Assets	139,484				141,535				139,484	141,535	156,961
Mozambique [Member]
Segment Reporting Information [Line Items]
Long-Lived Assets	50,475				53,854				50,475	53,854	50,045
All Other Countries [Member]
Segment Reporting Information [Line Items]
Sales and Other Operating Revenues									1,710,051	1,618,353	1,517,513
Long-Lived Assets	$ 137,169				$ 131,950				$ 137,169	$ 131,950	$ 128,921

X

- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 131

-Paragraph 38

-Subparagraph b(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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X

- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 03

-Paragraph 1



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(a))

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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