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Variable Interest Entities VIEs (Tables)
12 Months Ended
Dec. 31, 2011
Variable Interest Entities VIEs  
Consolidated VIE assets and liabilities
 December 31,2011 2010
 (Dollars in thousands)     
 Assets     
  Cash$ 13,299 $ 1,673
  Other current assets  3,719   323
  Intangible assets  501,829   487,962
  Property, plant and equipment  27,642   1,548
  Other assets and deferred charges  3,612  
  Total assets$ 550,101 $ 491,506
        
 Liabilities     
  Current liabilities$ 5,944 $ 95
  Deferred liabilities and credits  5,481  
  Total liabilities$ 11,425 $ 95