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Other Financial Information | 12 Months Ended
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Dec. 31, 2015
Other Financial Information [Abstract] |
Other Financial Information | Other Financial Information OTHER OPERATING REVENUES – Other operating revenues in the Consolidated and Combined Income Statements includes the following items:
(Thousands of dollars) | 2015 |  | 2014 |  | 2013
Renewable Identification Numbers (RINs) sales | $ | 117,513 |  |  | $ | 92,916 |  |  | $ | 91,391 |
Other | 3,321 |  |  | 3,193 |  |  | 2,907 |
Total other operating revenue | $ | 120,834 |  |  | $ | 96,109 |  |  | $ | 94,298 |
CASH FLOW DISCLOSURES — Cash income taxes paid (collected), net of refunds, were $113,520,000, $158,063,000 and $47,757,000 for the three years ended December 31, 2015, 2014 and 2013, respectively. Interest paid was $31,798,000, $34,019,000 and $1,647,000 for the years ended December 31, 2015, 2014 and 2013, respectively. Noncash reductions (additions) to net parent investment related primarily to settlement of income taxes were $453,000 for the year ended December 31, 2013.
(Thousands of dollars) | 2015 |  | 2014 |  | 2013
Accounts receivable | $ | 2,857 |  |  | $ | 59,519 |  |  | $ | 325,063 |
Inventories | 1,121 |  |  | 750 |  |  | 4,011 |
Prepaid expenses and other current assets | (27,107 | ) |  | 477 |  |  | (7,755 | )
Accounts payable and accrued liabilities | 1,043 |  |  | (53,234 | ) |  | (271,379 | )
Income taxes payable | (25,599 | ) |  | (37,325 | ) |  | 6,892 |
Current deferred income tax liabilities | 1,099 |  |  | (6,662 | ) |  | (5,628 | )
Net decrease (increase) in noncash operating working capital | $ | (46,586 | ) |  | $ | (36,475 | ) |  | $ | 51,204 |

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