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Related Party Transactions (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Satellite Construction Contracts        
Revenues $ 22,427 $ 33,594 $ 46,583 $ 75,845
Telesat [Member]
       
Satellite Construction Contracts        
Revenues 22,501 33,587 46,712 75,825
Milestone payments received from Telesat $ 15,726 $ 41,121 $ 34,305 $ 72,118