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Related Party Transactions (Schedule Of Related Party Transactions) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Related Party Transaction [Line Items]      
Revenues from Telesat satellite construction contracts $ 139,960 $ 137,244 $ 92,144
Milestone payments received from Telesat 140,000 137,000 92,000
Telesat [Member]
     
Related Party Transaction [Line Items]      
Revenues from Telesat satellite construction contracts 139,911 137,195 92,095
Milestone payments received from Telesat $ 126,579 $ 168,130 $ 89,419