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Variable Interest Entities (Tables)
9 Months Ended
Sep. 30, 2011
Variable Interest Entity Classification Of Carrying Amount Assets And Liabilities Net [Abstract] 
Consolidated VIE assets and liabilities
  September 30, December 31,
 2011 2010
       
(Dollars in thousands)     
Assets     
 Cash$27,884 $1,673
 Other current assets 119  323
 Licenses 485,261  487,962
 Property, plant and equipment 5,009  1,548
 Other assets and deferred charges 1,260  
 Total assets$519,533 $491,506
       
Liabilities     
 Other current liabilities$29 $95
 Total liabilities$29 $95