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Long-Term Obligations (Tables)
12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Maturities of Long-term Debt Principal maturities of the Partnership's existing third party debt instruments for the next five years and thereafter are as follows as of December 31, 2018 (in thousands):
 
 
2019
 
2020
 
2021
 
2022
 
2023
 
Thereafter
 
Total
DKL Credit Facility
 
$

 
$

 
$

 
$

 
$
456,700

 
$

 
$
456,700

2025 Notes
 
$

 
$

 
$

 
$

 
$

 
$
250,000

 
$
250,000