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Investment in Unconsolidated Entities (Tables)
9 Months Ended
Sep. 30, 2012
Equity Method Investment, Summarized Financial Information [Abstract]  
Equity method investments, summarized results of operations
   Three Months Ended Nine Months Ended
   September 30, September 30,
   2012 2011 2012 2011
(Dollars in thousands)           
Revenues $ 1,451,642 $ 1,392,082 $ 4,314,727 $ 4,081,942
Operating expenses   1,067,915   1,038,697   3,164,334   3,114,173
 Operating income   383,727   353,385   1,150,393   967,769
Other income (expense), net  (334)   755   1,304   (83)
Net income $ 383,393 $ 354,140 $ 1,151,697 $ 967,686