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Summary Of Significant Accounting Policies (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Advertising and promotional expenses $ 1,000,000 $ 1,100,000 $ 500,000
Stock based compensation expense 867,000 960,000 341,000
Maximum [Member]
     
Cash, FDIC insured amount $ 250,000    
Intangible assets useful lives 15 years    
Maximum [Member] | Support Equipment [Member]
     
Estimated useful life 19 years    
Maximum [Member] | Communication And Network Equipment [Member]
     
Estimated useful life 15 years    
Maximum [Member] | Interest Equipment [Member]
     
Estimated useful life 5 years    
Maximum [Member] | Buildings And Other Support Equipment [Member]
     
Estimated useful life 50 years    
Minimum [Member]
     
Intangible assets useful lives 3 years    
Minimum [Member] | Support Equipment [Member]
     
Estimated useful life 3 years    
Minimum [Member] | Communication And Network Equipment [Member]
     
Estimated useful life 10 years    
Minimum [Member] | Interest Equipment [Member]
     
Estimated useful life 3 years    
Minimum [Member] | Buildings And Other Support Equipment [Member]
     
Estimated useful life 14 years