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Partners' Equity	9 Months Ended
Partners' Equity	Sep. 30, 2018
Equity [Abstract]
Equity	7. Partners' Equity Following the Partnership’s cash distribution for the second quarter of 2017, the requirement under the Partnership’s partnership agreement for the conversion of all subordinated units was satisfied. As a result, effective August 30, 2017, the 12,686,115 subordinated units owned by Westlake were converted into common units on a one-for-one basis and thereafter participate on terms equal with all other common units in distributions of available cash. As discussed in Note 6, the subordinated units were considered converted as of July 1, 2017 for purposes of calculating net income per unit and, therefore, the subordinated units did not share in the distribution of cash generated nor did the Partnership allocate any earnings to the subordinated unitholders for the determination of net income per unit subsequent to June 30, 2017. On September 29, 2017, the Partnership completed its secondary offering of 5,175,000 common units at a price of $22.00 per unit. Net proceeds to the Partnership from the sale of the units were $110,739, net of underwriting discounts, structuring fees and estimated offering expenses of approximately $3,111.