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Intangible Assets (Tables)
3 Months Ended
Mar. 31, 2013
Licenses  
Licenses
Licenses     
   March 31, 2013 March 31, 2012
(Dollars in thousands)     
Balance, beginning of period$ 1,456,794 $ 1,470,769
 Acquisitions  14,150   11,096
Balance, end of period$ 1,470,944 $ 1,481,865