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Investment in Unconsolidated Entities (Tables)
 12 Months Ended
Dec. 31, 2012
Equity Method Investment, Summarized Financial Information [Abstract]  
Equity and cost method investments
December 31,2012 2011
(Dollars in thousands)     
Equity method investments:     
 Capital contributions, loans and advances$ 10,323 $ 13,787
 Cumulative share of income  1,017,449   928,019
 Cumulative share of distributions  (884,852)   (805,321)
    142,920   136,485
Cost method investments  1,611   1,611
Total investments in unconsolidated entities$ 144,531 $ 138,096
Equity method investments, summarized results of operations
Year Ended December 31,2012 2011 2010
(Dollars in thousands)        
Results of Operations        
 Revenues $5,804,466 $5,519,024 $4,950,306
 Operating expenses  4,363,399  4,282,277  3,549,098
 Operating income  1,441,067  1,236,747  1,401,208
 Other income, net 4,003  4,976  37,701
 Net income $1,445,070 $1,241,723 $1,438,909
Equity method investments, summarized financial position
December 31, 2012 2011
(Dollars in thousands)     
Assets     
 Current$ 444,100 $ 404,751
 Due from affiliates  298,707   199,167
 Property and other  1,896,784   1,935,125
  $ 2,639,591 $ 2,539,043
       
Liabilities and Equity     
 Current liabilities$ 350,067 $ 300,780
 Deferred credits  80,660   79,787
 Long-term liabilities  21,328   22,943
 Long-term capital lease obligations  405   234
 Partners' capital and shareholders' equity  2,187,131   2,135,299
  $ 2,639,591 $ 2,539,043