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Other Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Other Financial Information [Abstract] |
Schedule of Noncash Operating Working Capital (Increase) Decrease |
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﻿(Thousands of dollars) | 2017 |  | 2016 |  | 2015
﻿Accounts receivable | $ | 114,401 |  | 119,671 |  | 297,625
﻿Inventories |  | 26,883 |  | (5,171) |  | (15,340)
﻿Prepaid expenses |  | 29,570 |  | 149,946 |  | (144,845)
﻿Deferred income tax assets |  | – |  | – |  | 3,924
﻿Accounts payable and accrued liabilities |  | (51,439) |  | (328,078) |  | (36,887)
﻿Current income tax liabilities |  | 16,999 |  | 24,943 |  | (69,413)
﻿ Net (increase) decrease in noncash operating working capital | $ | 136,414 |  | (38,689) |  | 35,064
﻿Supplementary disclosures (including discontinued operations): |  |  |  |  |  |
﻿Cash income taxes paid, net of refunds | $ | 68,076 |  | 6,707 |  | 118,667
﻿Interest paid, net of amounts capitalized of $4,488 in 2017, $4,322 in 2016 and $7,290 in 2015 |  | 147,975 |  | 127,798 |  | 110,386
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﻿Noncash investing activities, related to continuing operations: |  |  |  |  |  |
﻿Asset retirement costs capitalized | $ | 8,509 |  | 13,690 |  | 76,775
﻿Decrease in capital expenditure accrual |  | 99,199 |  | 158,885 |  | 462,474
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- Definition Tabular disclosure of the net increase (decrease) in operating capital in the operating section of the statement of cash flows, represents the entire footnote disclosure that provides details regarding the net change during the reporting period of all assets and liabilities used in operating activities. + References No definition available. + Details
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