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Long-term Debt Payable to Westlake
 9 Months Ended
Sep. 30, 2017
Related Party Transactions [Abstract]  
Long-term Debt Payable to Westlake
Long-term Debt Payable to Westlake
Long-term debt payable to Westlake consists of the following:
 
 
September 30,
2017
 
December 31,
2016
August 2013 Promissory Notes (variable interest rate of prime plus 1.5%, original
   scheduled maturity of August 1, 2023)
 
$
—

 
$
31,775

OpCo Revolver (variable interest rate of LIBOR plus 3.0%, original scheduled maturity of
   August 4, 2019)

223,577

 
427,513

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

 
135,341

 
 
$
477,121

 
$
594,629


On August 1, 2017, the Partnership entered into an amendment to the MLP Revolver agreement, resulting in the extension of the maturity date from April 29, 2018 to April 29, 2021. On September 29, 2017, the Partnership repaid the remaining balance of the August 2013 Promissory notes in full and also repaid $197,432 of borrowings under the OpCo Revolver.
The weighted average interest rate on all long-term debt was 3.74% and 3.72% at September 30, 2017 and December 31, 2016, respectively.
As of September 30, 2017, the Partnership was in compliance with all of the covenants under the August 2013 Promissory Notes, the OpCo Revolver and the MLP Revolver.