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Other Financial Information (Tables)
 6 Months Ended
Jun. 30, 2019
Other Financial Information [Abstract]  
Noncash Operating Working Capital (Increase) Decrease
Additional disclosures regarding cash flow activities are provided below.໿

Six Months Ended
June 30,
(Thousands of dollars)
2019
 
2018
Net (increase) decrease in operating working capital other than cash and cash equivalents:
 
 
 
(Increase) decrease in accounts receivable
$
(141,793
)
 
(26,533
)
(Increase) decrease in inventories
(617
)
 
21,683

(Increase) decrease in prepaid expenses
(12,190
)
 
1,276

Increase (decrease) in accounts payable and accrued liabilities
147,569

 
26,673

Increase (decrease) in income taxes payable
1,665

 
(601
)
Net (increase) decrease in noncash operating working capital
$
(5,366
)
 
22,498

Supplementary disclosures:
 
 
 
Cash income taxes paid, net of refunds
$
79

 
(1,780
)
Interest paid, net of amounts capitalized of $0 in 2019 and 2018
102,802

 
78,373

 
 
 
 
Non-cash investing activities:
 
 
 
Asset retirement costs capitalized ¹
$
38,396

 
1,608

(Increase) decrease in capital expenditure accrual
(65,830
)
 
35,837


 
 
 
1  Includes asset retirement obligations assumed as part of the LLOG acquisition of $37.3 million. See Note Q.