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Business Segment Information (Tables)
 6 Months Ended
Jun. 30, 2025
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
Segment information for the periods presented below was as follows:
Offshore pipeline transportationMarine transportationOnshore transportation and servicesTotal
Three Months Ended June 30, 2025
Revenues:
        External Customers$125,128 $79,617 $172,603 $377,348 
        Intersegment Revenue(1)
242 — (242)— 
Total revenues of reportable segments(2)
$125,370 $79,617 $172,361 $377,348 
Segment Operating Expenses(35,979)(49,977)(60,549)(146,505)
Segment Product Costs— — (92,479)(92,479)
Other Segment Items(3)
(1,797)177 (875)(2,495)
Segment Margin(4)
$87,594 $29,817 $18,458 $135,869 
Three Months Ended June 30, 2024
Total revenues of reportable segments(2)(5)
$99,024 $81,871 $249,284 $430,179 
Segment Operating Expenses(29,892)(50,602)(71,285)(151,779)
Segment Product Costs— — (159,155)(159,155)
Other Segment Items(3)
16,999 274 1,398 18,671 
Segment Margin(4)
$86,131 $31,543 $20,242 $137,916 
Six Months Ended June 30, 2025
Revenues:
        External Customers$234,015 $160,261 $381,383 $775,659 
        Intersegment Revenue(1)
242 — (242)— 
Total revenues of reportable segments(2)
$234,257 $160,261 $381,141 $775,659 
Segment Operating Expenses(68,915)(100,866)(128,558)(298,339)
Segment Product Costs— — (220,170)(220,170)
Other Segment Items(3)
(1,200)443 871 114 
Segment Margin(4)
$164,142 $59,838 $33,284 $257,264 
Six Months Ended June 30, 2024
Total revenues of reportable segments(2)(5)
$201,014 $165,445 $498,167 $864,626 
Segment Operating Expenses(57,710)(103,010)(142,972)(303,692)
Segment Product Costs— — (319,543)(319,543)
Other Segment Items(3)
40,633 471 2,688 43,792 
Segment Margin(4)
$183,937 $62,906 $38,340 $285,183 
(1)Intersegment sales were conducted under terms that we believe were no more or less favorable than then-existing market conditions.
(2)Total revenues of reportable segments in the table above agrees to “Total revenues” as seen in our Unaudited Condensed Consolidated Statements of Operations for each respective period.
(3)Other Segment Items primarily includes adjustments related to the difference in timing of cash receipts for certain contractual agreements (applicable to our offshore pipeline transportation and onshore transportation and services segments), segment general and administrative expenses less the non-cash effects of our LTIP plan (applicable to all reportable segments), net effects of our noncontrolling interests (applicable to our offshore pipeline transportation segment), adjustments to include distributable cash generated by our equity investees (applicable to our offshore pipeline transportation and onshore transportation and services segments), and unrealized gains and losses from the valuation of our commodity derivative transactions (excluding fair value hedges) (applicable to our onshore transportation and services segment).
(4)A reconciliation of Income (loss) from continuing operations before income taxes to total Segment Margin for the periods is presented below.
(5)There were no intersegment revenues for the three and six months ended June 30, 2024.
Total assets by reportable segment were as follows:
June 30, 2025December 31, 2024
Offshore pipeline transportation$2,769,350 $2,748,296 
Marine transportation629,719 641,082 
Onshore transportation and services1,398,152 1,401,238 
Total reportable segment assets$4,797,221 $4,790,616 
Other assets41,317 39,656 
Assets held for discontinued operations— 2,207,420 
Total consolidated assets$4,838,538 $7,037,692 
Total growth and maintenance capital expenditures for fixed and intangible assets (including enhancements to existing facilities and construction of growth projects as well as contributions to equity investees) by reportable segment for the six months ended June 30, 2025 and 2024 were as follows:
Six Months Ended
June 30,
20252024
Offshore pipeline transportation(1)
$59,136 $119,414 
Marine transportation29,452 41,842 
Onshore transportation and services4,575 13,816 
Total reportable segment capital expenditures$93,163 $175,072 
Other654 6,088 
Total consolidated capital expenditures(2)
$93,817 $181,160 
(1)Capital expenditures in our offshore pipeline transportation segment for the six months ended June 30, 2025 and 2024 represent 100% of the costs incurred, including those funded by our noncontrolling interest holder.
(2)Growth and maintenance capital expenditures related to our previously owned Alkali Business are associated with our discontinued operations and are not included in the table above
Reconciliation of Segment Margin to (Loss) Income from Continuing Operations
Reconciliation of Income (loss) from continuing operations before income taxes to total Segment Margin:
 Three Months Ended
June 30, 		Six Months Ended
June 30,
 2025202420252024
Income (loss) from continuing operations before income taxes$10,356 $(3,976)$(26,061)$8,186 
Net income attributable to noncontrolling interests(10,417)(7,357)(19,186)(14,960)
Corporate general and administrative expenses15,068 19,405 56,744 34,616 
Depreciation, amortization and accretion59,011 53,940 118,022 106,103 
Interest expense, net60,754 64,539 130,792 126,873 
Adjustment to include distributable cash generated by equity investees not included in income and exclude equity in investees net income(1)
5,595 4,879 11,687 11,687 
Unrealized gains on derivative transactions excluding fair value hedges, net of changes in inventory value(133)(289)(204)(42)
Other non-cash items(4,229)(2,474)(6,951)(4,601)
Loss on extinguishment of debt (Note 10)
8,935 1,429 9,779 1,429 
Differences in timing of cash receipts for certain contractual arrangements(2)
(9,071)7,820 (17,358)15,892 
Total Segment Margin$135,869 $137,916 $257,264 $285,183 
(1)Includes distributions attributable to the quarter and received during or promptly following such quarter.
(2)Includes the difference in timing of cash receipts from customers during the period and the revenue we recognize in accordance with GAAP on our related contracts.