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Property, Plant and Equipment (Tables) | 6 Months Ended
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Jun. 30, 2019
Property, Plant and Equipment [Abstract] |
Net Changes in Capitalized Exploratory Well Costs | The following table reflects the net changes in capitalized exploratory well costs during the six-month periods ended June 30, 2019 and 2018.
(Thousands of dollars) | 2019 |  | 2018
Beginning balance at January 1 | $ | 207,855 |  |  | 155,103 |
Additions pending the determination of proved reserves | 50,307 |  |  | 30,493 |
Capitalized exploratory well costs charged to expense | (13,145 | ) |  | — |
Balance at June 30 | $ | 245,017 |  |  | 185,596 |
Aging of Capitalized Exploratory Well Costs | The following table provides an aging of capitalized exploratory well costs based on the date the drilling was completed for each individual well and the number of projects for which exploratory well costs have been capitalized. The projects are aged based on the last well drilled in the project.
﻿ | June 30,
﻿ | 2019 |  | 2018
(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 | $ | 33,125 |  |  | 3 |  |  | 2 |  |  | $ | 34,779 |  |  | 2 |  |  | 2 |
One to two years | 61,293 |  |  | 1 |  |  | 1 |  |  | 35,934 |  |  | 2 |  |  | 1 |
Two to three years | 27,266 |  |  | 1 |  |  | 1 |  |  | 50,272 |  |  | 2 |  |  | 2 |
Three years or more | 123,333 |  |  | 5 |  |  | — |  |  | 64,611 |  |  | 6 |  |  | — |
﻿ | $ | 245,017 |  |  | 10 |  |  | 4 |  |  | $ | 185,596 |  |  | 12 |  |  | 5 |

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- Definition Tabular disclosure of the change in capitalized exploratory costs during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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