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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Cash flows from operating activities      
Net income $ 298,576 $ 369,159 $ 334,626
Adjustments to reconcile net income to net cash provided by operating activities      
Depreciation and amortization 127,978 111,899 110,203
Loss from disposition of property, plant and equipment 2,754 2,345 4,933
Other gains, net (11) (182) (27)
Changes in operating assets and liabilities      
Accounts receivable—third parties 2,474 7,221 1,332
Net accounts receivable—Westlake (32,029) 25,737 27,331
Inventories 1,289 374 283
Prepaid expenses and other current assets 38 (2) (137)
Accounts payable—third parties (2,353) (2,693) 1,569
Accrued and other liabilities 6,915 (5,821) 4,026
Deferred charges and other assets and others, net (125,162) (23,036) (32,140)
Net cash provided by operating activities 280,469 485,001 451,999
Cash flows from investing activities      
Additions to property, plant and equipment (78,817) (48,971) (46,821)
Investments with Westlake under the Investment Management Agreement (10,000) (40,000) (174,116)
Maturities of investments with Westlake under the Investment Management Agreement 120,000 0 145,000
Net cash provided by (used for) investing activities 31,183 (88,971) (75,937)
Cash flows from financing activities      
Proceeds from debt payable to Westlake 173,500 219,000 209,250
Repayment of debt payable to Westlake (173,500) (219,000) (209,250)
Distributions to noncontrolling interest retained in OpCo by Westlake (259,247) (329,898) (315,805)
Distributions to unitholders (66,452) (66,435) (66,420)
Net cash used for financing activities (325,699) (396,333) (382,225)
Net decrease in cash and cash equivalents (14,047) (303) (6,163)
Cash and cash equivalents at beginning of the year 58,316 58,619 64,782
Cash and cash equivalents at end of the year $ 44,269 $ 58,316 $ 58,619