Other Financial Information (Tables)

6 Months Ended

Jun. 30, 2017

Other Financial Information [Abstract]

Noncash Operating Working Capital (Increase) Decrease

	Six Months Ended June 30,
(Thousands of dollars)	2017		2016
Net (increase) decrease in operating working capital other than    cash and cash equivalents:
Decrease in accounts receivable	$	125,283	109,105
Decrease (increase) in inventories		5,918	(4,659)
Decrease in prepaid expenses		9,206	99,524
Decrease in other		–	5,564
Decrease in accounts payable and accrued liabilities		(136,500)	(337,302)	*
Increase in current income tax liabilities		38,674	40,975
Net (increase) decrease in noncash operating working capital	$	42,581	(86,793)
Supplementary disclosures:
Cash income taxes paid, net of refunds	$	9,448	(4,367)
Interest paid, net of amounts capitalized		72,136	52,654
Non-cash investing activities:
Asset retirement costs capitalized	$	797	8,693
Decrease in capital expenditure accrual		43,370	165,329

*2016 balances included payments for deepwater rig contract exit of $261.8 million.