Selected Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Accrued Liabilities, Current	$ 290,659	$ 292,863
Equity Method Investments	30,502	34,166
Inventory	153,682	141,241
Inventory [Line Items]
Inventory	153,682	141,241
Prepaid Expense, Current	62,171	48,616
Debt Securities, Available-for-sale, Current	6,229	10,179
Other Inventory, Net of Reserves	81,110	78,453
Other current assets	68,400	58,795
Intangible Assets, Net (Excluding Goodwill)	12,641	14,317
Cash surrender value of life insurance policies	41,922	39,562
Equity Method Investments	30,502	34,166
Other	19,190	20,205
Other Assets, Noncurrent	104,255	108,250
Payroll and related costs	134,538	135,042
Accrued job costs	49,032	47,721
Accrued Income Taxes, Current	$ 35,826	$ 35,929
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accounts Payable and Accrued Liabilities, Current	Accounts Payable and Accrued Liabilities, Current
Other	$ 52,482	$ 55,373
Accrued Liabilities, Current	290,659	292,863
Deferred Income Taxes and Other Tax Liabilities, Noncurrent	1,375
Deferred Tax Liabilities, Gross, Noncurrent		2,993
Supplemental Executive Retirement Plan	35,195	33,982
Long-Term Incentive Plan	11,996	12,640
Liability for Uncertainty in Income Taxes, Noncurrent	14,830	15,010
Other	26,708	24,619
Liabilities, Other than Long-term Debt, Noncurrent	90,104	89,244
ROVs [Member]
Schedule of Equity Method Investments [Line Items]
Inventory	72,572	62,788
Inventory [Line Items]
Inventory	$ 72,572	$ 62,788