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Other Financial Information (Tables)
 6 Months Ended
Jun. 30, 2016
Other Financial Information [Abstract]  
Schedule of Renewable Identification Numbers (RINS) and Other Revenue
Other operating revenues in the Consolidated Statements of Income include the following items: 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(Thousands of dollars)
2016
 
2015
 
2016
 
2015
Renewable Identification Numbers (RINs) sales
$
43,868

 
$
36,248

 
$
82,643

 
$
73,847

Other
702

 
664

 
2,168

 
1,613

Other operating revenues
$
44,570

 
$
36,912

 
$
84,811

 
$
75,460
Summary of Changes in Operating Working Capital
 
Six Months Ended June 30,
(Thousands of dollars)
2016
 
2015
Accounts receivable
$
(11,921
)
 
$
(32,463
)
Inventories
3,412

 
(36,386
)
Prepaid expenses and other current assets
23,978

 
(11,859
)
Accounts payable and accrued liabilities
17,955

 
67,207

Income taxes payable
24,003

 
(20,046
)
Current deferred income tax liabilities
—

 
8,637

Net decrease (increase) in noncash operating working capital
$
57,427

 
$
(24,910
)