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Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Licenses    
Balance, beginning of period $ 1,470,769 $ 1,452,101
Acquisitions 12,647 2,800
Other 786  
Balance, end of period $ 1,484,202 $ 1,454,901