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Property, Plant And Equipment, Intangible Assets And Goodwill (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Increase in property, plant and equipment $ 5,300,000 $ 17,200,000  
Increase in intangible assets 15,200,000 35,000,000  
Increase in goodwill 24,700,000 70,600,000  
Assumed liabilities 700,000    
Amortization expense 300,000,000 328,300,000 332,300,000
Stucture impairment 1,700,000   4,000,000
Goodwill impairment charge   (1,146,000) 2,100,000
FCC licenses [Member]
      
Impairment of intangibles     500,000
Billboard permits [Member]
      
Impairment of intangibles 35,900,000 6,500,000 4,800,000
Talent contracts [Member]
      
Impairment of intangibles     3,900,000
Traffic Business [Member]
      
Purchase price   24,300,000  
Repayment of intercompany debt   95,000,000  
Brouwer & Partners [Member]
      
Purchase price   12,500,000  
WOR [Member]
      
Purchase price 30,000,000    
WFNX [Member]
      
Purchase price $ 14,500,000