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Long-term Debt Payable to Westlake
 3 Months Ended
Mar. 31, 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:
 
 
March 31,
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

 
$
31,775

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

433,090

 
427,513

MLP Revolver (variable interest rate of LIBOR plus 2.0%, original scheduled maturity of
   April 29, 2018)
 
135,341

 
135,341

 
 
$
600,206

 
$
594,629


The weighted average interest rate on all long-term debt was 3.86% and 3.72% at March 31, 2017 and December 31, 2016, respectively.
As of March 31, 2017, the Partnership was in compliance with all of the covenants under the August 2013 Promissory Notes, the OpCo Revolver and the MLP Revolver.