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Other Financial Information (Noncash Operating Working Capital (Increase) Decrease) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Net (increase) decrease in operating working capital, excluding cash and cash equivalents: |  |  |  |
Decrease in accounts receivable |  |  | $ 75,100 | $ 251,706
Decrease in inventories |  |  | 9,718 | 4,747
(Increase) in prepaid expenses |  |  | (6,682) | (17,400)
Increase (decrease) in accounts payable and accrued liabilities |  |  | 40,687 | (264,078)
(Decrease) in income taxes payable |  |  | (1,493) | (1,236)
Net (increase) decrease in noncash operating working capital |  |  | 117,330 | (26,261)
Supplementary disclosures: |  |  |  |
Cash income taxes paid, net of refunds |  |  | 1,685 | (12,559)
Interest paid, net of amounts capitalized of $11.6 million in 2021 and $5.9 million in 2020 |  |  | 127,793 | 139,651
Capitalized interest paid |  |  | 11,600 | 5,900
Non-cash investing activities: |  |  |  |
Asset retirement costs capitalized |  |  | 36,300 | 6,342
Decrease in capital expenditure accrual |  |  | $ 31,301 | $ 74,742
Impairment of asset retirement obligation |  | $ 74,400 |  |
Other operating income | $ 71,800 |  |  |
Asset life extension period |  |  | 10 years |

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