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Other Financial Information
6 Months Ended
Jun. 30, 2024
Other Financial Information [Abstract]  
Other Financial Information
Note F – Other Financial Information
Additional disclosures regarding cash flow activities are provided below.
Six Months Ended
June 30,
(Thousands of dollars)20242023
Net (increase) decrease in operating working capital, excluding cash and cash equivalents:
(Increase) decrease in accounts receivable $7,355 $(18,915)
(Increase) decrease in inventories2,170 (8,353)
Decrease in prepaid expenses2,296 8,291 
Increase (decrease) in accounts payable and accrued liabilities ¹(9,689)6,642 
Increase (decrease) in income taxes payable(1,006)(3,005)
Net decrease (increase) in noncash working capital$1,126 $(15,340)
Supplementary disclosures:
Cash income taxes paid, net of refunds$3,236 $10,904 
Interest paid, net of amounts capitalized of $7.8 million in 2024 and $6.8 million in 2023
38,262 54,305 
Non-cash investing activities:
Asset retirement costs capitalized$16,175 $2,742 
(Increase) decrease in capital expenditure accrual(24,780)20,522 
1 Excludes payable balances relating to contingent consideration for prior acquisitions.