Cash Flow Disclosures (Tables)

9 Months Ended

Sep. 30, 2014

Cash Flow Disclosures [Abstract]

Cash Flow Activities

		Nine Months
		Ended September 30,
(Thousands of dollars)	2014		2013
Net (increase) decrease in operating working capital other than    cash and cash equivalents:
Decrease (increase) in accounts receivable	$	29,586	(75,735)
Increase in inventories		(3,326)	(51,279)
Increase in prepaid expenses		(2,235)	(52,793)
Decrease in deferred income tax assets		1,290	40,145
Increase (decrease) in accounts payable and accrued liabilities		59,369	(84,344)
Increase (decrease) in current income tax liabilities		(77,744)	199,461
Total	$	6,940	(24,545)
Supplementary disclosures (including discontinued operations):
Cash income taxes paid	$	438,309	414,676
Interest paid, net of amounts capitalized		44,657	1,077