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Revenue (Components of Contracts in Progress) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]    
Costs and earnings in excess of billings for contracts in progress $ 33,626 $ 52,057
Costs and earnings in excess of billings for completed contracts 15,664 14,972
Total contract revenues in excess of billings 49,290 67,029
Current portion of contract revenues in excess of billings 49,290 65,922
Long-term contract revenues in excess of billings   1,107
Total billings in excess of contract revenues (29,392) (9,914)
Costs And Earnings In Excess Of Billings [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Costs and earnings for contracts in progress 296,736 262,125
Amounts billed (263,110) (210,068)
Billings In Excess Of Costs And Earnings [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Costs and earnings for contracts in progress 228,398 85,099
Amounts billed $ (257,790) $ (95,013)