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v3.25.4

Segment Information (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 USD ($) segment | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number of operating segments | segment | 1 |  |
Number of reportable segments | segment | 1 |  |
Depreciation and amortization | $ 127,978 | $ 111,899 | $ 110,203
Cost of sales | 818,847 | 716,957 | 803,332
Selling, general and administrative expenses | 28,271 | 28,495 | 29,751
Interest expense—Westlake | 22,899 | 25,701 | 26,501
Net income | 298,576 | 369,159 | 334,626
Assets | 1,256,533 | 1,287,956 |
Operating Segments | OpCo |  |  |
Segment Reporting Information [Line Items] |  |  |
Raw material, energy, manufacturing and logistics costs | 690,869 | 605,058 | 693,129
Depreciation and amortization | 127,978 | 111,899 | 110,203
Cost of sales | 818,847 | 716,957 | 803,332
Selling, general and administrative expenses | 24,853 | 24,699 | 26,217
Other segment items | (582) | (3,005) | (1,786)
Interest expense—Westlake | 1,316 | 1,410 | 1,496
Net income | 323,577 | 397,245 | 363,028
Assets | 1,222,123 | 1,238,420 |
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest expense—Westlake | 21,583 | 24,291 | 25,005
Net income | (25,001) | (28,086) | (28,402)
Assets | 34,410 | 49,536 |
Affiliated Entity |  |  |
Segment Reporting Information [Line Items] |  |  |
Net co-products, ethylene and other sales—third parties | $ 1,033,276 | $ 950,801 | $ 1,026,655

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