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Intangible Assets (Tables)
3 Months Ended
Mar. 31, 2012
Licenses  
Licenses
Licenses     
   March 31, March 31,
   2012 2011
(Dollars in thousands)     
Balance, beginning of period$1,470,769 $1,452,101
 Acquisitions 11,096  300
Balance, end of period$1,481,865 $1,452,401