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Other Financial Information - Noncash Operating Working Capital (Increase) Decrease) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net (increase) decrease in operating working capital, excluding cash and cash equivalents: |  |  |  |
(Increase) decrease in accounts receivable | $ 164,613 | $ (232,037) | $ (30,212) |
(Increase) decrease in inventories | 5,953 | 10,258 | 16,794 |
(Increase) decrease in prepaid expenses | 7,178 | 4,650 | (10,011) |
Increase (decrease) in accounts payable and accrued liabilities | (208,740) | 196,773 | 8,784 |
Increase (decrease) in income taxes payable | (1,031) | 3,469 | (1,458) |
Net (increase) decrease in noncash operating working capital | (32,027) | (16,887) | (16,103) | [1]
Supplementary disclosures: |  |  |  |
Cash income taxes paid, net of refunds | (44,715) | (6,645) | (7,603) |
Interest paid, net of amounts capitalized of $8.0 million in 2020, $1.8 million in 2019 and $0.2 million in 2018 | 191,561 | 179,722 | 158,071 |
Capitalized interest paid | 8,000 | 1,800 | 200 |
Non-cash investing activities: |  |  |  |
Asset retirement costs capitalized | 14,736 | 33,874 | 346,387 |
(Increase) decrease in capital expenditure accrual | $ 84,645 | $ (73,426) | $ 9,817 |
[1] | Reclassified to conform with current presentation

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