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Contracts in Progress (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Contractors [Abstract]    
Costs incurred on uncompleted contracts $ 766,399 $ 461,144
Estimated earnings 137,592 73,170
Costs incurred and estimated earnings on uncompleted contracts 903,991 534,314
Less: Billings to date (914,723) (546,858)
Costs and estimated earnings in excess of billings on uncompleted contracts, net (10,732) (12,544)
Costs and estimated earnings in excess of billings on uncompleted contracts 38,280 9,217
Billings in excess of costs and estimated earnings on uncompleted contracts (49,012) (21,761)
Claims and unapproved change orders $ 1,000 $ 1,100