Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 17,249	$ 88,900
Receivables under Investment Management Agreements with Related Parties, Current	119,009	0
Accounts receivable, net—Westlake	60,405	126,977
Accounts receivable, net—third parties	16,651	12,085
Inventories	3,881	3,934
Prepaid expenses and other current assets	413	269
Total current assets	217,608	232,165
Property, plant and equipment, net	1,206,246	1,222,238
Other assets, net
Goodwill	5,814	5,814
Deferred charges and other assets, net	88,030	95,011
Total other assets, net	93,844	100,825
Total assets	1,517,698	1,555,228
Current liabilities
Accounts payable—Westlake	14,123	12,130
Accounts payable—third parties	10,073	9,930
Accrued liabilities	20,724	15,717
Total current liabilities	44,920	37,777
Long-term debt payable to Westlake	477,121	594,629
Deferred income taxes	2,099	1,736
Other liabilities	79	123
Total liabilities	524,219	634,265
Commitments and contingencies (Note 15)
EQUITY
Accumulated other comprehensive income	226	200
Total Westlake Chemical Partners LP partners' capital	216,861	102,484
Noncontrolling interest in Westlake Chemical OpCo LP (OpCo)	776,618	818,479
Total equity	993,479	920,963
Total liabilities and equity	1,517,698	1,555,228
Limited Partner [Member] | Common units [Member] | Public [Member]
EQUITY
Limited Partners' Capital Account	409,684	297,367
Total equity	409,684	297,367
Limited Partner [Member] | Common units [Member] | Westlake [Member]
EQUITY
Limited Partners' Capital Account	49,025	4,813
Total equity	49,025	4,813
Limited Partner [Member] | Subordinated units [Member] | Westlake [Member]
EQUITY
Limited Partners' Capital Account	0	42,534
Total equity	0	42,534
General Partner [Member] | Westlake [Member]
EQUITY
General partner—Westlake	(242,074)	(242,430)
Total equity	$ (242,074)	$ (242,430)