v3.8.0.1

Oil and Gas Producing Activities (Tables) | 12 Months Ended
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Dec. 31, 2017
Extractive Industries [Abstract] |
Schedule of Information Regarding Costs Incurred for Oil and Gas Property Acquisition, Development and Exploration Activities | Set forth below is certain information regarding the costs incurred for oil and gas property acquisition, development and exploration activities (in thousands):
|  | For the Years Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Property acquisition costs: |  |  |  |  |  |  |  |  |  |  |  |
Unproved properties |  | $ | 231 |  |  | $ | 17 |  |  | $ | 653 |
Proved properties(1) |  |  | 17,331 |  |  |  | — |  |  |  | — |
Exploration costs |  |  | 3,657 |  |  |  | 3,923 |  |  |  | 4,439 |
Development costs(2) |  |  | 43,202 |  |  |  | 15,884 |  |  |  | 146,237 |
Total costs incurred |  | $ | 64,421 |  |  | $ | 19,824 |  |  | $ | 151,329 |
| (1) | For the year ended December 31, 2017, acquisition costs of proved properties included the fair value of assets acquired in the Bolt-On Acquisition. See Note 2 for additional disclosures related to the Bolt-On Acquisition.
| (2) | For the years ended December 31, 2017, 2016 and 2015, development costs included $39,000, $36,000 and $151,000, respectively, in non-cash asset retirement obligations.
Schedule of Information Regarding Results of Operations for Oil and Gas Producing Activities | Set forth below is certain information regarding the results of operations for oil and gas producing activities (in thousands):
|  | For the Years Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Revenues |  | $ | 105,349 |  |  | $ | 90,302 |  |  | $ | 131,336 |
Production costs |  |  | (26,546 | ) |  |  | (27,467 | ) |  |  | (40,057 | )
Exploration expense |  |  | (3,657 | ) |  |  | (3,923 | ) |  |  | (4,439 | )
Depletion |  |  | (70,521 | ) |  |  | (79,044 | ) |  |  | (109,319 | )
Impairment of oil and gas properties |  |  | — |  |  |  | — |  |  |  | (220,197 | )
Income tax benefit (expense) |  |  | (1,641 | ) |  |  | 7,144 |  |  |  | 86,120 |
Results of operations |  | $ | 2,984 |  |  | $ | (12,988 | ) |  | $ | (156,556 | )

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