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Guarantor Disclosures (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 04, 2014
Jul. 17, 2012
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2012
Condensed Financial Statements, Captions [Line Items]          
Stated interest rate     6.50%    
3.60% Senior Notes Due 2022 [Member]          
Condensed Financial Statements, Captions [Line Items]          
Stated interest rate   3.60% 3.60% 3.60% 3.60%
Maturity   2022 2022    
Senior notes, minimum debt amount guaranteed by subsidiaries     $ 5,000    
Subsidiaries [Member] | Limited Partner [Member] | IPO [Member] | Westlake Chemical Partners LP [Member]          
Condensed Financial Statements, Captions [Line Items]          
Limited partner interest 10.60%