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Product Sales Revenues (Tables)
 6 Months Ended
Jun. 30, 2017
Product Sales Revenue [Abstract]  
Components of Product Sales Revenues
For the three and six months ended June 30, 2016 and 2017, product sales revenue included the following (in thousands): 
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2016
 
2017
 
2016
 
2017
Physical sale of petroleum products
$
135,459

 
$
167,790

 
$
266,039

 
$
384,730

Change in value of futures contracts
(11,770
)
 
14,214

 
4,212

 
42,894

Total product sales revenue
$
123,689

 
$
182,004

 
$
270,251

 
$
427,624