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Other Financial Information
 9 Months Ended
Sep. 30, 2016
Other Financial Information [Abstract]  
Other Financial Information
Other Financial Information
 
OTHER OPERATING REVENUES – Other operating revenues in the Consolidated Statements of Income include the following items: 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(Thousands of dollars)
2016
 
2015
 
2016
 
2015
Renewable Identification Numbers (RINs) sales
$
48,047

 
$
20,037

 
$
130,690

 
$
93,883

Other
772

 
717

 
2,940

 
2,331

Other operating revenues
$
48,819

 
$
20,754

 
$
133,630

 
$
96,214


 
CASH FLOW DISCLOSURES — Cash income taxes paid, net of refunds, were $57,472,000 and $77,830,000 for the nine month periods ended September 30, 2016 and 2015, respectively. Interest paid was $35,244,000 and $31,337,000 for the nine month periods ended September 30, 2016 and 2015, respectively.  
 
Nine Months Ended September 30,
(Thousands of dollars)
2016
 
2015
Accounts receivable
$
(3,403
)
 
$
(5,742
)
Inventories
3,364

 
(8,082
)
Prepaid expenses and other current assets
11,891

 
(63
)
Accounts payable and accrued liabilities
(6,289
)
 
(16,642
)
Income taxes payable
(181
)
 
(11,695
)
Current deferred income tax liabilities
—

 
9,030

Net decrease (increase) in noncash operating working capital
$
5,382

 
$
(33,194
)