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Variable Interest Entities (Details) (USD $)
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Dec. 31, 2009
Assets    
Cash$ 504,952,000$ 269,292,000$ 294,426,000$ 294,411,000
Other current assets10,693,000 10,804,000 
Licenses1,470,550,0001,445,501,0001,452,101,0001,435,000,000
Property, plant and equipment2,654,494,000 2,574,522,000 
Other assets61,941,000 50,367,000 
Liabilities    
Customer deposits and deferred revenues177,123,000 146,428,000 
Other current liabilities95,665,000 121,823,000 
Capital contributions and advances to VIEs15,800,0001,200,000  
Variable Interest Entities (VIE's)
    
Assets    
Cash27,884,000 1,673,000 
Other current assets119,000 323,000 
Licenses485,261,000 487,962,000 
Property, plant and equipment5,009,000 1,548,000 
Other assets1,260,000   
Total assets519,533,000 491,506,000 
Liabilities    
Other current liabilities29,000 95,000 
Total liabilities$ 29,000 $ 95,000