Business Segment Information (Schedule of Total Assets and Total Growth and Maintenance Capital Expenditures by Reportable Segment) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)
Segment Reporting Information [Line Items]
Assets	$ 5,228,553		$ 4,860,703
Capital Expenditures	$ 97,844	$ 122,371
Costs incurred, percentage	1	1
Operating Segments
Segment Reporting Information [Line Items]
Assets	$ 4,133,471		4,827,040
Capital Expenditures	95,521	$ 121,381
Operating Segments | Offshore pipeline transportation
Segment Reporting Information [Line Items]
Assets	2,632,842		2,755,595
Capital Expenditures	24,713	75,332
Operating Segments | Marine transportation
Segment Reporting Information [Line Items]
Assets	584,666		618,474
Capital Expenditures	59,883	40,393
Operating Segments | Onshore transportation and services
Segment Reporting Information [Line Items]
Assets	915,963		1,452,971
Capital Expenditures	10,925	5,656
Other assets(1)
Segment Reporting Information [Line Items]
Assets	1,095,082		$ 33,663
Other
Segment Reporting Information [Line Items]
Capital Expenditures	$ 2,323	$ 990