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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2015
Accounting Policies [Abstract] |
Inventory | Inventory consists of the following:
| December 31,
| 2015 |  | 2014
| (In thousands)
Equipment and materials | $ | 4,920 |  |  | $ | 14,225 |
Crude oil inventory | 6,152 |  |  | 7,129 |
Total inventory | $ | 11,072 |  |  | $ | 21,354 |
Net Changes in Capitalized Exploratory Well Costs | Net changes in capitalized exploratory well costs are reflected in the following table for the periods presented:
| December 31,
| 2015 |  | 2014 |  | 2013
| (In thousands)
Beginning of period | $ | 34,522 |  |  | $ | 123,215 |  |  | $ | 40,424 |
Exploratory well cost additions (pending determination of proved reserves) | 51,995 |  |  | 336,344 |  |  | 346,814 |
Exploratory well cost reclassifications (successful determination of proved reserves) | (84,228 | ) |  | (425,037 | ) |  | (264,023 | )
Exploratory well dry hole costs (unsuccessful in adding proved reserves) | — |  |  | — |  |  | — |
End of period | $ | 2,289 |  |  | $ | 34,522 |  |  | $ | 123,215 |

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