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Long-term Debt Payable to Westlake (Tables)
 3 Months Ended
Mar. 31, 2019
Related Party Transactions [Abstract]  
Related Party Transactions, Long-term Debt
Long-term debt payable to Westlake consists of the following:
 
 
March 31,
2019
 
December 31,
2018
OpCo Revolver (variable interest rate of LIBOR plus 2.0%, scheduled maturity of
September 25, 2023)

$
224,064

 
$
224,064

MLP Revolver (variable interest rate of LIBOR plus 2.0%, scheduled maturity of
April 29, 2021)
 
377,055

 
253,544

 
 
$
601,119

 
$
477,608