Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash flows from operating activities
Net income	$ 42,309	$ 89,646
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	27,068	27,994
Loss from disposition of property, plant and equipment	103	271
Other losses, net	137	256
Changes in operating assets and liabilities
Accounts receivable—third parties	(1,553)	(8,751)
Net accounts receivable—Westlake	(1,164)	3,720
Inventories	1,325	(428)
Prepaid expenses and other current assets	243	185
Accounts payable—third parties	36,942	(1,173)
Accrued and other liabilities	45,892	(3,231)
Deferred charges and other assets and others, net	(105,521)	(3,924)
Net cash provided by operating activities	45,781	104,565
Cash flows from investing activities
Additions to property, plant and equipment	(15,956)	(9,773)
Maturities of investments with Westlake under the Investment Management Agreement	30,000	0
Net cash provided by (used for) investing activities	14,044	(9,773)
Cash flows from financing activities
Proceeds from debt payable to Westlake	54,000	54,000
Repayment of debt payable to Westlake	(54,000)	(54,000)
Distributions to noncontrolling interest retained in OpCo by Westlake	(51,906)	(81,044)
Distributions to unitholders	(16,611)	(16,607)
Net cash used for financing activities	(68,517)	(97,651)
Net decrease in cash and cash equivalents	(8,692)	(2,859)
Cash and cash equivalents at beginning of period	58,316	58,619
Cash and cash equivalents at end of period	$ 49,624	$ 55,760