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Accounts Receivable (Details Textual) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accounts Receivable (Textual) [Abstract]    
Long-term contracts receivable $ 38,840 $ 43,340
U.S. Government [Member]
   
Accounts Receivable (Textual) [Abstract]    
Long-term contracts receivable $ 620 $ 480