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Contracts in Progress (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Contractors [Abstract]    
Costs incurred on uncompleted contracts $ 1,104,441 $ 884,244
Estimated earnings 200,816 144,160
Costs incurred and estimated earnings on uncompleted contracts 1,305,257 1,028,404
Less: Billings to date (1,303,028) (1,035,796)
Costs and estimated earnings in excess of billings on uncompleted contracts, net 2,229 (7,392)
Costs and estimated earnings in excess of billings on uncompleted contracts 43,196 41,389
Billings in excess of costs and estimated earnings on uncompleted contracts $ (40,967) $ (48,781)