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Other Financial Information (Noncash Operating Working Capital (Increase) Decrease) (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Net (increase) decrease in operating working capital other than cash and cash equivalents: |  |  |
(Increase) decrease in accounts receivable | $ (141,793) | $ (26,533) |
(Increase) decrease in inventories | (617) | 21,683 |
(Increase) decrease in prepaid expenses | (12,190) | 1,276 |
Increase (decrease) in accounts payable and accrued liabilities | 147,569 | 26,673 |
Increase (decrease) in income taxes payable | 1,665 | (601) |
Net (increase) decrease in noncash operating working capital | (5,366) | 22,498 | [1]
Supplementary disclosures: |  |  |
Cash income taxes paid, net of refunds | 79 | (1,780) |
Interest paid, net of amounts capitalized of $0 in 2019 and 2018 | 102,802 | 78,373 |
Amounts capitalized | 0 |  |
Non-cash investing activities: |  |  |
Asset retirement costs capitalized ¹ | 38,396 | 1,608 |
(Increase) decrease in capital expenditure accrual | $ (65,830) | $ 35,837 |
[1] | Reclassified to conform to current presentation (See Note A).

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