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Commitments And Contingencies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 signs	Dec. 31, 2011	Dec. 31, 2010	May 24, 2012
Maximum aggregate contingency subject to performance requirements of the seller	$ 30,000,000
Rent expense	1,140,000,000	1,160,000,000	1,100,000,000
Payment of income tax expense due to settlement				$ 10,900,000
Static signs converted to digital	83

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Static signs converted to digital

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- Definition

Amount of potential cash payments that could result from the contingent consideration arrangement.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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Rent expense for each period for which an income statement is presented for minimum lease payments, contingent rentals, and sublease rentals.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 16

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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-Name Statement of Financial Accounting Standard (FAS)

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