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Variable Interest Entities VIEs (Tables)
6 Months Ended
Jun. 30, 2013
Variable Interest Entities VIEs  
Consolidated VIE assets and liabilities
  June 30, 2013 December 31, 2012
(Dollars in thousands)     
Assets     
 Cash and cash equivalents$ 5,001 $ 5,849
 Other current assets  117   120
 Licenses  308,091   308,091
 Property, plant and equipment, net  17,532   16,443
 Other assets and deferred charges  1,015   887
 Total assets$ 331,756 $ 331,390
       
Liabilities     
 Current liabilities$ 3 $ 1,013
 Deferred liabilities and credits  3,276   3,024
 Total liabilities$ 3,279 $ 4,037