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Contracts in Progress (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Contractors [Abstract]        
Costs incurred on uncompleted contracts $ 884,244 $ 461,144    
Estimated earnings 144,160 73,170    
Costs incurred and estimated earnings on uncompleted contracts 1,028,404 534,314    
Less: Billings to date (1,035,796) (546,858)    
Costs and estimated earnings in excess of billings on uncompleted contracts, net (7,392) (12,544)    
Costs and estimated earnings in excess of billings on uncompleted contracts 41,389 9,217 $ 46,006 $ 47,389
Billings in excess of costs and estimated earnings on uncompleted contracts $ (48,781) $ (21,761) $ (33,923) $ (35,668)