Business Segment Information (Schedule of Total Assets and Total Growth and Maintenance Capital Expenditures by Reportable Segment) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)
Segment Reporting Information [Line Items]
Assets	$ 5,211,859		$ 7,037,692
Assets held for discontinued operations	$ 0		2,207,420
Costs incurred, percentage	1	1
Operating Segments
Segment Reporting Information [Line Items]
Assets	$ 4,795,538		4,790,616
Capital Expenditures	427	$ 2,977
Operating Segments | Offshore pipeline transportation
Segment Reporting Information [Line Items]
Assets	2,759,749		2,748,296
Capital Expenditures	29,314	63,626
Operating Segments | Soda and Sulfur Services
Segment Reporting Information [Line Items]
Capital Expenditures	16,990	12,310
Operating Segments | Marine transportation
Segment Reporting Information [Line Items]
Assets	640,525		641,082
Capital Expenditures	3,176	6,541
Operating Segments | Onshore transportation and services
Segment Reporting Information [Line Items]
Assets	1,395,264		1,401,238
Capital Expenditures	49,480	82,477
Other assets
Segment Reporting Information [Line Items]
Capital Expenditures	49,907	$ 85,454
Other assets
Segment Reporting Information [Line Items]
Assets	$ 416,321		$ 39,656