Income Taxes (Summary Of Open Tax Years, By Jurisdiction) (Details)	12 Months Ended
Dec. 31, 2011
United States [Member]
Income Tax Contingency [Line Items]
Open tax years, by jurisdiction	2010
Various U.S. States [Member]
Income Tax Contingency [Line Items]
Open tax years, by jurisdiction	2007
Tunisia [Member]
Income Tax Contingency [Line Items]
Open tax years, by jurisdiction	2006
South Africa [Member]
Income Tax Contingency [Line Items]
Open tax years, by jurisdiction	2006

Identification, by major jurisdiction, of tax years that remain open to examination under enacted tax laws.

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

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 48

-Paragraph 21

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration