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Investment in Unconsolidated Entities (Tables)
9 Months Ended
Sep. 30, 2011
Equity Method Investment Summarized Financial Information Abstract 
Equity method investments, summarized results of operations
 Three Months Ended  Nine Months Ended 
 September 30,  September 30,
 2011 2010  2011 2010
(Dollars in thousands)              
               
Revenues$1,387,000 $1,260,000  $4,066,000  $3,680,000 
Operating expenses  1,034,000  908,000   3,099,000   2,613,000 
Operating income 353,000  352,000   967,000   1,067,000 
Other income 1,000  8,000   3,000   28,000 
Net income$354,000 $360,000  $970,000  $1,095,000