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Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Intangible Assets
Gross Carrying Amount	$ 1,922,799	$ 1,918,811
Accumulated Amortization	1,401,262	1,349,088
Unamortizable intangible assets:
Goodwill gross carrying amount	1,680,461	1,679,770
Goodwill accumulated amortization	253,635	253,635
Customer lists and contracts [Member]
Intangible Assets
Estimated Life (Years), Minimum	7
Estimated Life (Years), Maximum	10
Gross Carrying Amount	467,151	466,412
Accumulated Amortization	447,107	441,641
Non-competition agreements [Member]
Intangible Assets
Estimated Life (Years), Minimum	3
Estimated Life (Years), Maximum	15
Gross Carrying Amount	63,496	63,493
Accumulated Amortization	61,414	60,955
Site locations [Member]
Intangible Assets
Estimated Life (Years), Maximum	15
Gross Carrying Amount	1,378,544	1,375,298
Accumulated Amortization	879,652	833,418
Other finite lived intangible assets [Member]
Intangible Assets
Estimated Life (Years), Minimum	5
Estimated Life (Years), Maximum	15
Gross Carrying Amount	13,608	13,608
Accumulated Amortization	$ 13,089	$ 13,074

X

- Definition

The accumulated amount of amortization of goodwill as of the balance sheet date.

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- Definition

Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of goodwill.

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- Definition

Unamortizable intangible assets including goodwill.

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- Definition

The accumulated amount of amortization of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph a(1)

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- Definition

Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets having statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph a(1)

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- Definition

The maximum useful life of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company.

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The minimum useful life of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company.

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