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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2018
Asset Retirement Obligations [Abstract] |
Schedule of Reconciliation of Beginning and Ending Aggregate Carrying Amount of Asset Retirement Obligations |
﻿ |  |  |  |
﻿ |  |  |  |
﻿(Thousands of dollars) | 2018 |  | 2017
﻿Balance at beginning of year | $ | 722,139 |  | 781,057
﻿ Accretion expense |  | 44,559 |  | 42,590
﻿ Liabilities incurred |  | 13,886 |  | 52,331
﻿ Liabilities assumed from PAI |  | 359,643 |  | –
﻿ Revisions of previous estimates |  | (24,959) |  | (47,612)
﻿ Liabilities settled |  | (23,398) |  | (29,111)
﻿ Liabilities assumed by purchaser of oil and gas assets |  | – |  | (87,456)
﻿ Changes due to translation of foreign currencies |  | (8,966) |  | 10,340
﻿ Balance at end of year |  | 1,082,904 |  | 722,139
﻿ Current portion of liability at end of year 1 |  | (55,481) |  | (12,840)
﻿ Noncurrent portion of liability at end of year | $ | 1,027,423 |  | 709,299
﻿ 1 Included in Other accrued liabilities on the Consolidated Balance Sheet. ﻿

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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