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Product Sales Revenues (Tables)
 6 Months Ended
Jun. 30, 2016
Product Sales Revenue [Abstract]  
Components of Product Sales Revenues
For the three and six months ended June 30, 2015 and 2016, product sales revenue included the following (in thousands): 
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2015
 
2016
 
2015
 
2016
Physical sale of petroleum products
$
133,319

 
$
135,459

 
$
302,566

 
$
266,039

Change in value of NYMEX contracts
(23,350
)
 
(11,770
)
 
(19,470
)
 
4,212

Total product sales revenue
$
109,969

 
$
123,689

 
$
283,096

 
$
270,251