Quarterly report pursuant to Section 13 or 15(d)

Contracts in Progress (Details)

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Contracts in Progress (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Revenue earned on uncompleted contracts $ 649,582 $ 557,164
Less: Billings to date (669,595) (552,701)
Net underbilling (overbilling) (20,013) 4,463
Costs and estimated earnings in excess of billing on uncompleted contracts 32,407 33,006
Billings in excess of costs and estimated earnings on uncompleted contracts (52,420) (28,543)
Net underbilling (overbilling) $ (20,013) $ 4,463