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Contract Receivables and Billings in Excess of Revenue Recognized (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Billed accounts receivable $ 21,621 $ 27,875
Unbilled accounts receivable 9,229 5,225
Accounts Receivable, Gross 30,850 33,100
Less: allowance for doubtful accounts (66) (276)
Accounts and Other Receivables, Net, Current $ 30,784 $ 32,824