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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

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