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Other Financial Information (Tables)
 3 Months Ended
Mar. 31, 2020
Other Financial Information [Abstract]  
Noncash Operating Working Capital (Increase) Decrease
Additional disclosures regarding cash flow activities are provided below.໿
 
Three Months Ended
March 31,
(Thousands of dollars)
2020
 
2019
Net (increase) decrease in operating working capital, excluding cash and cash equivalents:
 
 
 
(Increase) decrease in accounts receivable ¹
$
186,436

 
(112,673
)
(Increase) decrease in inventories
7,553

 
3,930

(Increase) decrease in prepaid expenses
(10,179
)
 
(10,763
)
Increase (decrease) in accounts payable and accrued liabilities ¹
(76,287
)
 
21,131

Increase (decrease) in income taxes payable
304

 
(130
)
Net (increase) decrease in noncash operating working capital
$
107,827

 
(98,505
)
Supplementary disclosures:
 
 
 
Cash income taxes paid, net of refunds
$
72

 
—

Interest paid, net of amounts capitalized of $2.4 million in 2020 and $0 million in 2019
42,344

 
39,024

 
 
 
 
Non-cash investing activities:
 
 
 
Asset retirement costs capitalized
$
280

 
486

(Increase) decrease in capital expenditure accrual
10,633

 
(63,328
)
1 Excludes receivable/payable balances relating to mark-to-market of crude contracts and contingent consideration relating to acquisitions.