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Suspended Exploratory Well Costs (Tables) | 12 Months Ended
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Dec. 31, 2014
Extractive Industries [Abstract] |
Suspended Exploratory Well Costs | The following table reflects the changes in capitalized exploratory well costs for the years ended December 31, 2014, 2013 and 2012 (in thousands, except for number of projects):
| 2014 |  | 2013 |  |  | 2012 |
Balance at beginning of period | $ | 6,964 |  | $ | 57,360 |  |  | $ | 93,388 |
Additions to capitalized exploratory well costs pending the determination of proved reserves |  | 18,747 |  |  | 39,832 |  |  |  | 153,250 |
Reclassifications to wells, facilities and equipment based on determination of proved reserves |  | (15,735 | ) |  | (84,840 | ) |  |  | (184,298 | )
Divested wells |  | ¾ |  |  | ¾ |  |  |  | (4,980 | )
Capitalized exploratory well costs charged to expense |  | (6,980 | ) |  | (5,388 | ) |  |  | — |
Balance at end of period |  | 2,996 |  |  | 6,964 |  |  |  | 57,360 |
Less exploratory well costs that have been capitalized for a period of one year or less |  | (2,996 | ) |  | ¾ |  |  |  | (45,965 | )
Capitalized exploratory well costs that have been capitalized for a period greater than one year | $ | ¾ |  | $ | 6,964 |  |  | $ | 11,395 |
Number of projects that have exploratory well costs that have been capitalized for a period greater than one year |  | ¾ |  |  | 1 |  |  |  | 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=8451039&loc=SL6806780-109447 + Details
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