Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net sales—Westlake	$ 247,887	$ 217,763	$ 708,646	$ 660,022
Net co-product, ethylene and other sales—third parties	46,079	14,206	175,756	60,996
Total net sales	293,966	231,969	884,402	721,018
Cost of sales	218,038	131,578	589,746	427,049
Gross profit	75,928	100,391	294,656	293,969
Selling, general and administrative expenses	7,792	6,255	24,734	18,590
Income from operations	68,136	94,136	269,922	275,379
Other income (expense)
Interest expense—Westlake	(2,190)	(2,320)	(6,650)	(9,701)
Other income, net	24	17	52	725
Income before income taxes	65,970	91,833	263,324	266,403
Income tax provision (benefit)	(105)	(15)	333	408
Net income	66,075	91,848	262,991	265,995
Less: Net income attributable to noncontrolling interest in OpCo	53,285	73,313	209,956	214,853
Net income attributable to Westlake Chemical Partners LP and limited partners' interest in net income	$ 12,790	$ 18,535	$ 53,035	$ 51,142
Net income per limited partner unit attributable to Westlake Chemical Partners LP per limited partner unit (basic and diluted)
Weighted average limited partner units outstanding (basic and diluted) (in units)	35,209,976	35,194,545	35,203,609	35,194,545
Common units
Other income (expense)
Net income attributable to Westlake Chemical Partners LP and limited partners' interest in net income	$ 12,790	$ 18,535	$ 53,035	$ 51,142
Net income per limited partner unit attributable to Westlake Chemical Partners LP per limited partner unit (basic and diluted)
Common units (in usd per share)	$ 0.36	$ 0.53	$ 1.51	$ 1.45
Weighted average limited partner units outstanding (basic and diluted) (in units)	35,209,976	35,194,545	35,203,609	35,194,545
Common units | Westlake
Net income per limited partner unit attributable to Westlake Chemical Partners LP per limited partner unit (basic and diluted)
Weighted average limited partner units outstanding (basic and diluted) (in units)	14,122,230	14,122,230	14,122,230	14,122,230
Common units | Publicly and Privately Held
Net income per limited partner unit attributable to Westlake Chemical Partners LP per limited partner unit (basic and diluted)
Weighted average limited partner units outstanding (basic and diluted) (in units)	21,087,746	21,072,315	21,081,379	21,072,315