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Accounts Receivable (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Summary of Accounts Receivable    
Accounts Receivable Gross, Total $ 38,840 $ 43,340
Allowance for doubtful accounts (310) (356)
Accounts Receivable, Net, Total 38,530 42,984
Commercial [Member]
   
Summary of Accounts Receivable    
Accounts Receivable Gross, Total 38,220 42,860
U.S. Government [Member]
   
Summary of Accounts Receivable    
Accounts Receivable Gross, Total $ 620 $ 480