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Other Financial Information (Tables)
 12 Months Ended
Dec. 31, 2019
Other Financial Information [Abstract]  
Noncash Operating Working Capital (Increase) Decrease
Noncash operating working capital (increased) decreased during each of the three years ended December 31, 2019 as shown in the following table.
(Thousands of dollars)
2019
 
2018
 
2017
Net (increase) decrease in operating working capital, excluding cash and cash equivalents:
 
 
 
 
 
(Increase) decrease in accounts receivable ¹
$
(232,037
)
 
(30,212
)
 
(15,462
)
(Increase) decrease in inventories
10,258

 
16,794

 
15,429

(Increase) decrease in prepaid expenses
4,650

 
(10,011
)
 
15,752

Increase (decrease) in accounts payable and accrued liabilities ¹
196,773

 
8,784

 
70,376

Increase (decrease) in income taxes payable
3,469

 
(1,458
)
 
(7,249
)
Net (increase) decrease in noncash operating working capital
$
(16,887
)
 
(16,103
)
 
78,846

Supplementary disclosures:
 
 
 
 
 
Cash income taxes paid, net of refunds
$
(6,645
)
 
(7,603
)
 
(5,969
)
Interest paid, net of amounts capitalized of $1.8 million in 2019 and $0.2 million in 2018
179,722

 
158,071

 
144,455

 
 
 
 
 
 
Non-cash investing activities:
 
 
 
 
 
Asset retirement costs capitalized ²
$
33,874

 
346,387

 
126

(Increase) decrease in capital expenditure accrual
(73,426
)
 
9,817

 
16,325


1 Excludes receivable/payable balances relating to mark-to-market of crude contracts.
2 Includes asset retirement obligations assumed as part of the LLOG acquisition of $37.3 million.