Selected Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Accrued Liabilities, Current	$ 474,736	$ 411,781
Equity Method Investments	14,439	30,455
Deferred Income Taxes and Other Assets, Noncurrent	31,903	26,021
Inventory	222,849	209,798
Inventory [Line Items]
Inventory	222,849	209,798
Prepaid Expense, Current	81,668	68,464
Debt Securities, Available-for-sale, Current	7,000	0
Other Inventory, Net of Reserves	17,596	18,078
Inventory Valuation Reserves	36,000	40,000
Other current assets	88,668	68,464
Intangible Assets, Net (Excluding Goodwill)	33,332	21,182
Cash surrender value of life insurance policies	40,311	36,588
Equity Method Investments	14,439	30,455
Other	24,297	23,040
Other Assets, Noncurrent	144,282	137,286
Payroll and related costs	$ 153,273	$ 154,507
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accounts Payable and Accrued Liabilities, Current	Accounts Payable and Accrued Liabilities, Current
Accrued job costs	$ 62,390	$ 56,112
Accrued Income Taxes, Current	49,097	55,990
Interest Payable	12,667	12,667
Other	65,894	54,388
Accrued Liabilities, Current	474,736	411,781
Deferred Tax Liabilities, Gross, Noncurrent		1,033
Supplemental Executive Retirement Plan	33,936	35,679
Long-Term Incentive Plan	11,521	12,727
Liability for Uncertainty in Income Taxes, Noncurrent	24,169	27,093
Other	26,640	25,375
Liabilities, Other than Long-term Debt, Noncurrent	98,753	101,907
Manufactured Products
Schedule of Equity Method Investments [Line Items]
Inventory	113,104	104,364
Inventory [Line Items]
Inventory	113,104	104,364
Subsea Robotics
Schedule of Equity Method Investments [Line Items]
Inventory	92,149	87,356
Inventory [Line Items]
Inventory	$ 92,149	$ 87,356