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Long-term Debt Payable to Westlake (Tables)
 9 Months Ended
Sep. 30, 2020
Related Party Transactions [Abstract]  
Related Party Transactions, Long-term Debt
Long-term debt payable to Westlake consists of the following:
 
 
September 30,
2020
 
December 31,
2019
OpCo Revolver (variable interest rate of London Interbank Offered Rate ("LIBOR") plus 2.0%, scheduled maturity of September 25, 2023)

$
22,619

 
$
22,619

MLP Revolver (variable interest rate of LIBOR plus 2.0%, scheduled maturity of March 19, 2023)
 
377,055

 
377,055

 
 
$
399,674

 
$
399,674