Segment Information (Tables)

3 Months Ended

Mar. 31, 2025

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

The Partnership has one operating segment, which is the Partnership's reportable segment, OpCo. Consolidated net sales and provision for income taxes as disclosed in the consolidated statements of operations and depreciation and amortization and additions to property, plant and equipment as disclosed in the consolidated statements of cash flows are fully attributed to the OpCo segment, and as such, separate OpCo segment amounts are not repeated in the tables below.

	Three Months Ended March 31,
	2025		2024
Significant segment expenses and other segment items
OpCo
Raw material, energy, manufacturing and logistics costs	$	156,480	$	154,499
Depreciation and amortization	27,068		27,994
Total cost of sales	183,548		182,493
Selling, general and administrative expenses	6,672		6,052
Other segment items (1)	(971)		(750)
Interest expense—Westlake
OpCo	$	268	$	374
Corporate	5,269		6,207
	$	5,537	$	6,581
Net income
OpCo	$	48,380	$	96,878

A reconciliation of total segment net income to consolidated net income is as follows:

	Three Months Ended March 31,
	2025		2024
Net income from OpCo	$	48,380	$	96,878
Corporate net loss	(6,071)		(7,232)
Net income	$	42,309	$	89,646

	March 31, 2025		December 31, 2024
Total assets
OpCo	$	1,329,150	$	1,238,420
Corporate	42,202		49,536
	$	1,371,352	$	1,287,956

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(1)Other segment items includes interest expense—Westlake, other income, net and provision for income taxes.