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Income Taxes (Summary Of The Tax Years By Jurisdiction That Remain Subject To Examination By Taxing Authorities) (Details) | 12 Months Ended
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Dec. 31, 2011
U. S. Federal [Member] |
Open Tax Years by Major Tax Jurisdiction | 2008-2011
Various U.S. States [Member] |
Open Tax Years by Major Tax Jurisdiction | 2007-2011
Canada Federal [Member] |
Open Tax Years by Major Tax Jurisdiction | 2003-2011
Various Canadian Provinces [Member] |
Open Tax Years by Major Tax Jurisdiction | 2003-2011

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- Definition Identification, by major jurisdiction, of tax years that remain open to examination under enacted tax laws. + References 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-Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 + Details
Name: | us-gaap_OpenTaxYearsByMajorTaxJurisdiction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration