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Westlake Chemical Partners Offerings (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 29, 2017
Apr. 29, 2015
Aug. 04, 2014
Sep. 30, 2017
Sep. 30, 2016
Class of Stock [Line Items]          
Partners' Capital Account, Units, Sold in Public Offering 5,175,000   12,937,500    
Sale of Unit Price Per Unit $ 22.00   $ 24.00    
Net proceeds from issuance of Westlake Chemical Partners LP common units $ 110,739   $ 286,100 $ 110,739 $ 0
Payments of Stock Issuance Costs $ 3,111        
Payments of Derivative Issuance Costs     $ 24,400    
Limited Partner [Member] | Westlake Chemical OpCo LP [Member]          
Class of Stock [Line Items]          
Limited Partnership Ownership Percentage Increase 5.00% 2.70%      
Limited Partner [Member] | Westlake Chemical OpCo LP [Member] | Subsidiary of Common Parent [Member] | IPO [Member]          
Class of Stock [Line Items]          
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest 81.70%   89.40%    
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest 18.30%   10.60%    
Limited Partner [Member] | Westlake Chemical Partners LP [Member] | Subsidiary of Common Parent [Member] | IPO [Member]          
Class of Stock [Line Items]          
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest     47.80%