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Revenue (Components of Contracts in Progress) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]    
Costs and earnings in excess of billings for contracts in progress $ 1,022 $ 9,810
Costs and earnings in excess of billings for completed contracts 67,739 58,925
Total contract revenues in excess of billings 68,761 68,735
Current portion of contract revenues in excess of billings 68,761 68,735
Total billings in excess of contract revenues (18,066) (29,560)
Costs And Earnings In Excess Of Billings [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Costs and earnings for contracts in progress 477,609 206,330
Amounts billed (476,587) (196,520)
Billings In Excess Of Costs And Earnings [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Costs and earnings for contracts in progress 36,858 229,388
Amounts billed $ (54,924) $ (258,948)