Summary Of Major Accounting Policies (Details)-Allowance for Credit Losses - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Accounts Receivable, Allowance for Credit Loss	$ 2,200,000	$ 2,000,000
Interest Receivable	200,000	800,000
Financing Receivable, Allowance for Credit Loss	600,000	300,000
Financing Receivable, Allowance for Credit Loss, Writeoff	$ (1,300,000)	(400,000)	$ (53,000,000)
HistoricalCreditLossAnalysisPeriod	3 years
Accounts Receivable, Allowance for Credit Loss, Writeoff			29,549,000
Valuation Allowance [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ 1,300,000	400,000	53,000,000
Increase (Decrease) in Inventories	25,423,000	30,692,000	(7,313,000)
Manufactured Products
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff	(9,800,000)	(5,200,000)	(49,000,000)
Valuation Allowance [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	$ 9,800,000	$ 5,200,000	49,000,000
Increase (Decrease) in Inventories			20,000,000
Subsea Robotics
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss, Writeoff			(3,600,000)
Valuation Allowance [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff			$ 3,600,000