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Investment in Unconsolidated Entities (Tables)
3 Months Ended
Mar. 31, 2012
Equity Method Investment, Summarized Financial Information [Abstract]  
Equity method investments, summarized results of operations
   Three Months Ended
   March 31,
   2012 2011
(Dollars in thousands)       
Revenues $1,437,008  $ 1,329,057 
Operating expenses  1,076,750    1,036,245 
 Operating income  360,258    292,812 
Other income  649   (1,835)
Net income $360,907  $ 290,977