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Variable Interest Entities VIEs (Tables)
3 Months Ended
Mar. 31, 2015
Variable Interest Entities VIEs  
Consolidated VIE assets and liabilities
   March 31, 2015 December 31, 2014
(Dollars in thousands)     
Assets     
 Cash and cash equivalents$ 11,670 $ 2,588
 Other current assets  234   278
 Licenses  651,281   312,977
 Property, plant and equipment, net  10,129   10,671
 Other assets and deferred charges  247   60,059
  Total assets$ 673,561 $ 386,573
        
Liabilities     
 Current liabilities$ 3,634 $ 110
 Deferred liabilities and credits  599   622
  Total liabilities$ 4,233 $ 732