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Product Sales Revenues (Tables)
 9 Months Ended
Sep. 30, 2016
Product Sales Revenue [Abstract]  
Components of Product Sales Revenues
For the three and nine months ended September 30, 2015 and 2016, product sales revenue included the following (in thousands): 
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2015
 
2016
 
2015
 
2016
Physical sale of petroleum products
$
100,829

 
$
146,006

 
$
403,395

 
$
412,045

Change in value of NYMEX contracts
71,902

 
(12,650
)
 
52,432

 
(8,438
)
Total product sales revenue
$
172,731

 
$
133,356

 
$
455,827

 
$
403,607