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Investments in Unconsolidated Entities (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Equity and cost method investments      
Capital contributions, loans and advances $ 10,323 $ 13,787  
Cumulative share of income 1,017,449 928,019  
Cumulative share of distributions (884,852) (805,321)  
Equity method investments 142,920 136,485  
Cost method investments 1,611 1,611  
Total investments in unconsolidated entities 144,531 138,096  
Equity in earnings of unconsolidated entities 90,364 83,566 97,318
Los Angeles SMSA Limited Partnership
      
Equity and cost method investments      
Equity in earnings of unconsolidated entities 67,200 55,300 64,800
Ownership interest in equity method investment 5.50% 5.50% 5.50%
Aggregate equity method investments
      
Equity method investments, combined assets      
Current 444,100 404,751  
Due from affiliates 298,707 199,167  
Property and other 1,896,784 1,935,125  
Total assets 2,639,591 2,539,043  
Equity method investments, combined liabilities and equity      
Current liabilities 350,067 300,780  
Deferred credits 80,660 79,787  
Long-term liabilities 21,328 22,943  
Long-term capital lease obligations 405 234  
Partners' capital and stockholders' equity 2,187,131 2,135,299  
Total liabilities and equity 2,639,591 2,539,043  
Equity method investments, combined income statements      
Revenues 5,804,466 5,519,024 4,950,306
Operating expenses 4,363,399 4,282,277 3,549,098
Operating income 1,441,067 1,236,747 1,401,208
Other income (expense), net 4,003 4,976 37,701
Net income $ 1,445,070 $ 1,241,723 $ 1,438,909