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Investments in Unconsolidated Entities (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Equity and cost method investments          
Investments in unconsolidated entities $ 175,663   $ 175,663   $ 138,096
Equity in earnings of unconsolidated entities 25,154 22,469 46,768 43,360  
Equity method investments, combined income statements          
Revenues 1,420,492 1,355,114 2,851,865 2,679,573  
Operating expenses 1,014,995 1,034,407 2,086,883 2,065,762  
Operating income 405,497 320,707 764,982 613,811  
Other income (expense), net 1,320 1,386 2,236 2,813  
Net income 406,817 322,093 767,218 616,624  
Los Angeles SMSA Limited Partnership
          
Equity and cost method investments          
Equity in earnings of unconsolidated entities $ 19,200 $ 14,100 $ 36,300 $ 27,100  
Ownership interest in equity method investment 5.50% 5.50% 5.50% 5.50%