Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 23,331	$ 19,923
Receivable under the Investment Management Agreement—Westlake Chemical Corporation (Westlake)	191,241	162,773
Accounts receivable, net—Westlake	56,237	42,847
Accounts receivable, net—third parties	5,144	9,914
Inventories	1,652	2,484
Prepaid expenses and other current assets	557	470
Total current assets	278,162	238,411
Property, plant and equipment, net	1,060,840	1,102,995
Goodwill	5,814	5,814
Deferred charges and other assets, net	37,466	46,236
Total assets	1,382,282	1,393,456
Current liabilities
Accounts payable—Westlake	17,923	15,201
Accounts payable—third parties	6,816	6,141
Accrued and other liabilities	16,955	17,507
Total current liabilities	41,694	38,849
Long-term debt payable to Westlake	399,674	399,674
Deferred income taxes	1,527	1,649
Other liabilities	555	1,149
Total liabilities	443,450	441,321
Commitments and contingencies (Note 13)
EQUITY
Total Westlake Chemical Partners LP partners' capital	278,884	277,514
Noncontrolling interest in Westlake Chemical OpCo LP (OpCo)	659,948	674,621
Total equity	938,832	952,135
Total liabilities and equity	1,382,282	1,393,456
Limited Partner [Member] | Common units [Member] | Publicly and Privately Held [Member]
EQUITY
Limited Partners' Capital Account	472,556	471,736
Total equity	472,556	471,736
Limited Partner [Member] | Common units [Member] | Westlake [Member]
EQUITY
Limited Partners' Capital Account	48,900	48,350
Total equity	48,900	48,350
General Partner [Member] | Westlake [Member]
EQUITY
General partner—Westlake	(242,572)	(242,572)
Total equity	$ (242,572)	$ (242,572)