Other Financial Information

9 Months Ended

Sep. 30, 2018

Other Financial Information [Abstract]

Other Financial Information

Note G – Other Financial Information

Additional disclosures regarding cash flow activities are provided below.

	Nine Months Ended September 30,
(Thousands of dollars)	2018		2017
Net (increase) decrease in operating working capital other than    cash and cash equivalents:
(Increase) decrease in accounts receivable	$	(31,178)	90,614
Decrease in inventories		16,732	5,869
(Increase) decrease in prepaid expenses		(8,695)	25,285
Increase (decrease) in accounts payable and accrued liabilities		17,946	(115,977)
Increase(decrease) in income taxes payable		2,645	(4,721)
Net (increase) decrease in noncash operating working capital	$	(2,550)	1,070
Supplementary disclosures:
Cash income taxes paid, net of refunds	$	77,508	25,118
Interest paid, net of amounts capitalized of $3,719 in 2018 and $3,338 in 2017		115,009	95,899
Non-cash investing activities:
Asset retirement costs capitalized	$	2,907	38,992
(Increase) decrease in capital expenditure accrual		(751)	42,403