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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$1,431,372  $1,324,459 
Operating expenses  1,071,887   1,031,355 
Operating income 359,485   293,104 
Other income 916   1,427 
Net income$360,401  $294,531