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Product Sales Revenue
 12 Months Ended
Dec. 31, 2017
Product Sales Revenue [Abstract]  
Product Sales Revenue
Product Sales Revenue
The amounts reported as product sales revenue on our consolidated statements of income include revenue from the physical sale of petroleum products and mark-to-market adjustments from exchange-based futures contracts. See Note 13 – Derivative Financial Instruments for a discussion of our commodity hedging strategies and how our futures contracts impact product sales revenue.

For the years ended December 31, 2015, 2016 and 2017, product sales revenue included the following (in thousands):
 
 
 
Year Ended December 31,
 
 
2015
 
2016
 
2017
Physical sale of petroleum products
 
$
561,410

 
$
638,186

 
$
814,544

Change in value of futures contracts
 
68,426

 
(38,584
)
 
(56,338
)
Total product sales revenue
 
$
629,836

 
$
599,602

 
$
758,206