Summary of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Impairment		$ (1,146,000)	$ 2,100,000
Other than temporary impairment for equity method investments	2,600,000	4,800,000	6,500,000
Other than temporary impairment for available for sale securities	4,600,000	4,800,000	6,500,000
Barter and trade revenues	56,500,000	61,200,000	67,000,000
Barter and trade expenses	58,800,000	63,400,000	66,400,000
Advertising expenses	$ 113,400,000	$ 92,200,000	$ 82,000,000
Building and Improvements [Member]
Useful life minimum	10
Useful life maximum	39
Structures [Member]
Useful life minimum	5
Useful life maximum	15
Towers, Transmitters and Studio Equipment [Member]
Useful life minimum	7
Useful life maximum	20
Furniture and other equipment [Member]
Useful life minimum	3
Useful life maximum	20
Minimum [Member]
Percentage of ownership	20.00%
Maximum [Member]
Percentage of ownership	50.00%

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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- Definition

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

- Definition

The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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