Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net sales—Westlake	$ 219,803	$ 214,828
Total net sales	268,207	250,549
Cost of sales	180,508	147,001
Gross profit	87,699	103,548
Selling, general and administrative expenses	8,673	6,196
Income from operations	79,026	97,352
Other income (expense)
Interest expense—Westlake	(2,236)	(3,950)
Other income, net	7	585
Income before income taxes	76,797	93,987
Income tax provision	175	217
Net income	76,622	93,770
Less: Net income attributable to noncontrolling interest in OpCo	61,476	76,023
Net income attributable to Westlake Chemical Partners LP and limited partners' interest in net income	$ 15,146	$ 17,747
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)	35,198,903	35,194,545
Common units
Other income (expense)
Net income attributable to Westlake Chemical Partners LP and limited partners' interest in net income	$ 15,146	$ 17,747
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)	$ 0.43	$ 0.50
Weighted average limited partner units outstanding (basic and diluted) (in units)	35,198,903	35,194,545
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)	21,076,673	21,072,315
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
Net co-product, ethylene and other sales—third parties
Total net sales	$ 48,404	$ 35,721