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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$13,787  $22,885 
 Cumulative share of income 928,019   857,533 
 Cumulative share of distributions (805,321)  (721,182)
   136,485   159,236 
Cost method investments 1,611   1,611 
Total investments in unconsolidated entities$138,096  $160,847 
Equity method investments, summarized results of operations
Year Ended December 31,2011 2010 2009
(Dollars in thousands)        
Results of Operations        
 Revenues $5,519,024 $4,950,306 $4,793,269
 Operating expenses  4,282,277  3,549,098  3,418,116
 Operating income  1,236,747  1,401,208  1,375,153
 Other income, net 4,976  37,701  42,898
 Net income $1,241,723 $1,438,909 $1,418,051
Equity method investments, summarized financial position
December 31, 2011 2010
(Dollars in thousands)     
Assets     
 Current$404,751 $392,042
 Due from affiliates 199,167  396,201
 Property and other 1,935,125  1,962,128
  $2,539,043 $2,750,371
       
Liabilities and Equity     
 Current liabilities$300,780 $277,035
 Deferred credits 79,787  69,750
 Long-term liabilities 22,943  24,558
 Long-term capital lease obligations 234  43,657
 Partners' capital and shareholders' equity 2,135,299  2,335,371
  $2,539,043 $2,750,371