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Contract Receivables (Tables)
9 Months Ended
Sep. 30, 2012
Contract Receivables [Abstract]  
Summary of Contract receivables
                 
    September 30, 2012     December 31, 2011  

Billed

  $ 134,624     $ 149,725  

Unbilled

    72,473       61,447  

Allowance for doubtful accounts

    (1,461     (1,746
   

 

 

   

 

 

 

Contract receivables, net

  $ 205,636     $ 209,426