Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 24,980	$ 27,008
Receivables under Investment Management Agreements with Related Parties, Current	134,712	136,510
Accounts receivable, net—Westlake	43,257	43,884
Accounts receivable, net—third parties	19,017	18,083
Inventories	5,171	5,590
Prepaid expenses and other current assets	161	314
Total current assets	227,298	231,389
Property, plant and equipment, net	1,183,409	1,196,245
Other assets, net
Goodwill	5,814	5,814
Deferred charges and other assets, net	76,083	81,828
Total assets	1,492,604	1,515,276
Current liabilities
Accounts payable—Westlake	14,339	14,027
Accounts payable—third parties	7,798	10,516
Accrued liabilities	15,150	15,697
Total current liabilities	37,287	40,240
Long-term debt payable to Westlake	477,608	473,960
Deferred income taxes	2,272	2,220
Other liabilities	114	107
Total liabilities	517,281	516,527
Commitments and contingencies (Note 12)
EQUITY
Accumulated other comprehensive income	298	279
Total Westlake Chemical Partners LP partners' capital	219,117	219,814
Noncontrolling interest in Westlake Chemical OpCo LP (OpCo)	756,206	778,935
Total equity	975,323	998,749
Total liabilities and equity	1,492,604	1,515,276
Limited Partner [Member] | Common units [Member] | Public [Member]
EQUITY
Limited Partners' Capital Account	410,786	411,228
Total equity	410,786	411,228
Limited Partner [Member] | Common units [Member] | Westlake [Member]
EQUITY
Limited Partners' Capital Account	49,872	50,265
Total equity	49,872	50,265
Limited Partner [Member] | Subordinated units [Member] | Westlake [Member]
EQUITY
Total equity	0	0
General Partner [Member] | Westlake [Member]
EQUITY
General partner—Westlake	(241,839)	(241,958)
Total equity	$ (241,839)	$ (241,958)