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Contracts in Progress (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Contractors [Abstract]    
Costs incurred on uncompleted contracts $ 1,151,987 $ 884,244
Estimated earnings 202,369 144,160
Costs incurred and estimated earnings on uncompleted contracts 1,354,356 1,028,404
Less: Billings to date (1,355,220) (1,035,796)
Costs and estimated earnings in excess of billings on uncompleted contracts, net (864) (7,392)
Costs and estimated earnings in excess of billings on uncompleted contracts 32,271 41,389
Billings in excess of costs and estimated earnings on uncompleted contracts $ (33,135) $ (48,781)