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Long-term Debt Payable to Westlake (Tables)
 3 Months Ended
Mar. 31, 2018
Related Party Transactions [Abstract]  
Related Party Transactions, Long-term Debt
Long-term debt payable to Westlake consists of the following:
 
 
March 31,
2018
 
December 31,
2017
OpCo Revolver (variable interest rate of LIBOR plus 3.0%, original scheduled maturity of
   August 4, 2019)

$
224,064

 
$
220,416

MLP Revolver (variable interest rate of LIBOR plus 2.0%, original scheduled maturity of
   April 29, 2021)
 
253,544

 
253,544

 
 
$
477,608

 
$
473,960