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Valuation And Qualifying Accounts (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Retained earnings $ 3,151,172,000 $ 2,741,070,000  
Corporate Customer | Cumulative Effect, Period of Adoption, Adjustment [Member]      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Retained earnings 7,473,000    
Government Customer | Cumulative Effect, Period of Adoption, Adjustment [Member]      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Retained earnings 6,711,000    
Provisions For Losses On Long Term Contracts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 110,848,000 95,450,000 $ 80,962,000
Additions (Charged to Costs and Expenses) 133,076,000 34,975,000 38,560,000
Deductions (Write-Offs and Actual Losses Incurred) 26,764,000 19,577,000 24,072,000
Balance at End of Period 217,160,000 110,848,000 95,450,000
Deduction from inventories 30,861,000 41,032,000 34,820,000
Other accrued expenses 186,299,000 69,816,000 60,630,000
Additions Resulting from Acquisitions 0 0 0
Provisions for Claims and Potential Contractual Penalties and Others      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 6,045,000 3,661,000 2,557,000
Additions (Charged to Costs and Expenses) 983,000 2,946,000 1,244,000
Deductions (Write-Offs and Actual Losses Incurred) 2,021,000 562,000 140,000
Balance at End of Period 5,007,000 6,045,000 3,661,000
Additions Resulting from Acquisitions 0 0 0
Allowance For Doubtful Accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 14,006,000 9,172,000 9,162,000
Additions (Charged to Costs and Expenses) 796,000 5,701,000 674,000
Deductions (Write-Offs and Actual Losses Incurred) 618,000 867,000 664,000
Balance at End of Period 14,184,000 14,006,000 9,172,000
Additions Resulting from Acquisitions 0 0 0
Valuation Allowance On Deferred Taxes      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 77,913,000 165,199,000 164,906,000
Additions (Charged to Costs and Expenses) 0 0 293,000
Deductions (Write-Offs and Actual Losses Incurred) 30,877,000 87,286,000 0
Balance at End of Period 47,036,000 77,913,000 165,199,000
Additions Resulting from Acquisitions $ 0 $ 0 $ 0