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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$ 1,446,311 $ 1,386,808 $ 4,298,176 $ 4,066,382
Operating expenses   1,063,285   1,033,792   3,150,168   3,099,555
Operating income  383,026   353,016   1,148,008   966,827
Other income (expense), net  (51)   853   2,185   3,666
Net income$ 382,975 $ 353,869 $ 1,150,193 $ 970,493