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Property, Plant and Equipment (Tables) | 3 Months Ended
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Mar. 31, 2018
Property, Plant And Equipment [Abstract] |
Net Changes in Capitalized Exploratory Well Costs |
﻿ |  |  |  |  |
﻿ |  |  |  |  |
﻿(Thousands of dollars) | 2018 |  |  | 2017
﻿Beginning balance at January 1 | $ | 175,640 |  |  | 148,500
﻿Additions pending the determination of proved reserves |  | 623 |  |  | 39,653
﻿Reclassifications to proved properties based on the determination of proved reserves |  | – |  |  | (13,370)
﻿Capitalized exploratory well costs charged to expense |  | – |  |  | (8,360)
﻿Balance at March 31 | $ | 176,263 |  |  | 166,423
﻿
Aging of Capitalized Exploratory Well Costs |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | March 31,
﻿ | 2018 |  | 2017
﻿(Thousands of dollars) | Amount |  | No. of Wells |  | No. of Projects |  | Amount |  | No. of Wells |  | No. of Projects
﻿Aging of capitalized well costs: |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Zero to one year | $ | 13,642 |  | 2 |  | 1 |  | $ | 48,202 |  | 2 |  | 2
﻿One to two years |  | 27,757 |  | 1 |  | 1 |  |  | 53,729 |  | 3 |  | 3
﻿Two to three years |  | 49,642 |  | 2 |  | 2 |  |  | – |  | – |  | –
﻿Three years or more |  | 85,222 |  | 7 |  | 1 |  |  | 64,492 |  | 6 |  | –
﻿ | $ | 176,263 |  | 12 |  | 5 |  | $ | 166,423 |  | 11 |  | 5
﻿

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- Definition Tabular disclosure of the change in capitalized exploratory costs during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + Details
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- Definition Tabular disclosure of the amount of exploratory well costs that have been capitalized after the completion of drilling and the number of projects for which those costs relate. Additionally, for exploratory well costs that have been capitalized for periods greater than one year at the most recent balance sheet date, this block of text may be used to disclose an aging of those amounts by year, or by using a range of years, and the number of projects to which those costs relate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + Details
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