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Variable Interest Entities VIEs (Details) (USD $)
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Assets        
Cash and cash equivalents $ 437,624,000 $ 467,421,000 $ 378,358,000 $ 424,155,000
Other current assets   18,845,000 16,745,000  
Licenses 1,484,202,000 1,396,179,000 1,456,794,000 1,470,769,000
Property, plant and equipment, net   2,823,509,000 3,022,588,000  
Other assets and deferred charges   82,067,000 78,148,000  
Liabilities        
Current liabilities   901,891,000 754,999,000  
Capital contributions and advances 5,000,000      
Variable Interest Entities (VIE's)
        
Assets        
Cash and cash equivalents   5,001,000 5,849,000  
Other current assets   117,000 120,000  
Licenses   308,091,000 308,091,000  
Property, plant and equipment, net   17,532,000 16,443,000  
Other assets and deferred charges   1,015,000 887,000  
Total assets   331,756,000 331,390,000  
Liabilities        
Current liabilities   3,000 1,013,000  
Deferred liabilities and credits   3,276,000 3,024,000  
Total liabilities   $ 3,279,000 $ 4,037,000