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Investment in Unconsolidated Entities (Tables)
6 Months Ended
Jun. 30, 2012
Equity Method Investment, Summarized Financial Information [Abstract]  
Equity method investments, summarized results of operations
   Three Months Ended Six Months Ended
   June 30, June 30,
   2012 2011 2012 2011
(Dollars in thousands)               
Revenues $1,426,077  $ 1,360,803  $2,863,085  $ 2,689,860 
Operating expenses  1,019,669    1,039,231   2,096,420    2,075,476 
 Operating income  406,408    321,572   766,665    614,384 
Other income (expense), net 989   997   1,639   (838)
Net income $407,397  $ 322,569  $768,304  $ 613,546