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Investment in Unconsolidated Entities (Tables)
12 Months Ended
Dec. 31, 2011
Equity Method Investment, Summarized Financial Information [Abstract]  
Equity and cost method investments
December 31,2011 2010
(Dollars in thousands)       
Equity method investments:       
 Capital contributions, loans and advances $25,067  $34,171 
 Cumulative share of income  958,635   889,039 
 Cumulative share of distributions  (825,261)  (740,557)
   158,441   182,653 
Cost method investments  15,269   15,269 
Total investments in unconsolidated entities$173,710  $197,922 
Equity method investments, summarized results of operations
Year Ended December 31,2011 2010 2009
(Dollars in thousands)        
Results of Operations        
 Revenues $ 5,540,220 $ 4,971,525 $ 4,815,258
 Operating expenses   4,301,758   3,567,131   3,437,201
 Operating income   1,238,462   1,404,394   1,378,057
 Other income (expense)   960   36,168   41,802
 Net income $ 1,239,422 $ 1,440,562 $ 1,419,859
Equity method investments, summarized financial position
December 31,2011 2010
(Dollars in thousands)     
Assets     
 Current $435,732 $424,965
 Due from affiliates  199,167  396,201
 Property and other  1,988,331  2,015,959
  $2,623,230 $2,837,125
Liabilities and Equity     
 Current liabilities $304,742 $278,837
 Deferred credits 82,371  73,496
 Long-term liabilities 36,056  38,225
 Long-term capital lease obligations 234  43,657
 Partners’ capital and stockholders’ equity  2,199,827  2,402,910
  $2,623,230 $2,837,125