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Suspended Exploratory Well Costs (Tables) | 12 Months Ended
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Dec. 31, 2017
Extractive Industries [Abstract] |
Suspended Exploratory Well Costs | The following table reflects the changes in capitalized exploratory well costs for the years ended December 31, 2017, 2016 and 2015 (in thousands, except for number of projects):
| 2017 |  | 2016 |  |  | 2015 |
Balance at beginning of period | $ | 7,412 |  | $ | 4,161 |  |  | $ | 2,996 |
Additions to capitalized exploratory well costs pending the determination of proved reserves |  | 1,388 |  |  | 9,128 |  |  |  | 1,165 |
Reclassifications to wells, facilities and equipment based on determination of proved reserves |  | — |  |  | (5,877 | ) |  |  | — |
Capitalized exploratory well costs charged to expense |  | (8,800 | ) |  | — |  |  |  | — |
Balance at end of period |  | — |  |  | 7,412 |  |  |  | 4,161 |
Less exploratory well costs that have been capitalized for a period of one year or less |  | — |  |  | (7,412 | ) |  |  | (1,165 | )
Capitalized exploratory well costs that have been capitalized for a period greater than one year | $ | — |  | $ | — |  |  | $ | 2,996 |
Number of projects that have exploratory well costs that have been capitalized for a period greater than one year |  | — |  |  | — |  |  |  | 1 |

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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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- References No definition available. + Details
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