Other Financial Information

6 Months Ended

Jun. 30, 2018

Other Financial Information [Abstract]

Other Financial Information

Note G – Other Financial Information

Additional disclosures regarding cash flow activities are provided below.

	Six Months Ended June 30,
(Thousands of dollars)	2018		2017
Net (increase) decrease in operating working capital other than    cash and cash equivalents:
(Increase) decrease in accounts receivable	$	(15,528)	125,283
Decrease in inventories		16,929	5,918
(Increase) decrease in prepaid expenses		(7,890)	9,206
Increase (decrease) in accounts payable and accrued liabilities		49,311	(136,500)
Increase in income taxes payable		42,618	38,674
Net decrease in noncash operating working capital	$	85,440	42,581
Supplementary disclosures:
Cash income taxes paid, net of refunds	$	36,618	9,448
Interest paid, net of amounts capitalized of $2,377 in 2018 and $2,449 in 2017		79,279	72,136
Non-cash investing activities:
Asset retirement costs capitalized	$	1,608	797
Decrease in capital expenditure accrual		39,322	43,370