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Accounts Receivable (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Accounts Receivable [Abstract]    
Trade accounts receivable $ 150,033 $ 149,737
Revenue in excess of progress billings 16,868 17,105
Receivables related to the sale of discontinued businesses 3,795 16,555
Less: allowance for doubtful accounts (11,903) (11,862)
Total Accounts receivable, net $ 158,793 $ 171,535