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Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Intangible Assets    
Goodwill $ 202,998 $ 192,079
Change in the carrying amount of goodwill    
Balance at the beginning of the period 192,079  
Acquisitions 10,919  
Balance at the end of the period 202,998  
Summary of the carrying amounts of intangible assets    
Broadcast licenses 536,515 536,515
Intangible assets subject to amortization 85,950 75,625
Total intangible assets - gross carrying amount 622,465 612,140
Accumulated amortization $ (28,579) $ (16,071)