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Related Party Transactions (Schedule Of Related Party Transactions) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Related Party Transaction [Line Items]    
Revenues from Telesat satellite construction contracts $ 24,156 $ 42,251
Milestone payments received from Telesat 24,200 42,200
Telesat [Member]
   
Related Party Transaction [Line Items]    
Revenues from Telesat satellite construction contracts 24,211 42,238
Milestone payments received from Telesat $ 18,579 $ 30,997