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Other Financial Information (Noncash Operating Working Capital (Increase) Decrease) (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Net (increase) decrease in operating working capital, excluding cash and cash equivalents: |  |
(Increase) decrease in accounts receivable | $ (104,775) | $ 227,710
Decrease in inventories | 8,938 | 13,968
(Increase) in prepaid expenses | (1,945) | (20,712)
Increase (decrease) in accounts payable and accrued liabilities | 124,699 | (219,228)
(Decrease) in income taxes payable | (352) | (403)
Net decrease in noncash operating working capital | 26,565 | 1,335
Supplementary disclosures: |  |
Cash income taxes paid, net of refunds | 1,474 | (7)
Interest paid, net of amounts capitalized of $7.4 million in 2021 and $4.9 million in 2020 | 80,546 | 100,745
Capitalized interest paid | 7,400 | 4,900
Non-cash investing activities: |  |
Asset retirement costs capitalized | 6,669 | 6,342
Decrease in capital expenditure accrual | 20,614 | $ 58,602
Impairment of asset retirement obligation | $ 74,400 |

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