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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Distribution On August 1, 2017, the board of directors of Westlake GP declared a quarterly distribution for the period from April 1, 2017 through June 30, 2017 of $0.3650 per unit and $323 to IDR Holders. This distribution is payable on August 29, 2017 to unitholders and IDR Holders of record as of August 15, 2017. MLP Revolver Amendment On August 1, 2017, the Partnership entered into an amendment to the MLP Revolver agreement, resulting in the extension of the maturity date from April 29, 2018 to April 29, 2021. General Subsequent events were evaluated through the date on which the financial statements were issued.