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Supplemental Oil and Gas Disclosures | 12 Months Ended
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Dec. 31, 2017
Extractive Industries [Abstract] |
Supplemental Oil and Gas Disclosures | Note 23—Supplemental Oil and Gas Disclosures (Unaudited) Capitalized costs related to oil and gas activities are as follows (in thousands):
| December 31,
| 2017 |  | 2016
Company: |  |  |
Unproved properties | $ | — |  |  | $ | — |
Proved properties | 400 |  |  | 1,122 |
| 400 |  |  | 1,122 |
Accumulated depreciation and depletion | (275 | ) |  | (930 | )
Total | $ | 125 |  |  | $ | 192 |
Company’s share of Laramie Energy: |  |  |
Unproved properties | $ | 13,728 |  |  | $ | 14,416 |
Proved properties | 382,789 |  |  | 334,085 |
| 396,517 |  |  | 348,501 |
Accumulated depreciation, depletion, and amortization | (111,119 | ) |  | (91,454 | )
Total | $ | 285,398 |  |  | $ | 257,047 |
Costs incurred in oil and gas activities including costs associated with assets retirement obligations, are as follows (in thousands):
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Company: |  |  |  |  |
Development costs—other | $ | — |  |  | $ | — |  |  | $ | — |
Total | $ | — |  |  | $ | — |  |  | $ | — |
Company’s share of Laramie Energy: |  |  |  |  |
Acquisition costs | $ | — |  |  | $ | 65,324 |  |  | $ | — |
Development costs—other | 49,273 |  |  | 12,805 |  |  | 21,747 |
Total | $ | 49,273 |  |  | $ | 78,129 |  |  | $ | 21,747 |
For the years ended December 31, 2017, 2016, and 2015, neither we nor Laramie Energy incurred exploratory well costs so no amounts were capitalized or expensed during these respective periods. Accordingly, there were no suspended exploratory well costs at December 31, 2017, 2016, and 2015 that were being evaluated. A summary of the results of operations for oil and gas producing activities, excluding general and administrative costs, is as follows (in thousands):
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Company: |  |  |  |  |
Revenue |  |  |  |  |
Oil and gas revenues | $ | 288 |  |  | $ | 190 |  |  | $ | 2,019 |
Expenses |  |  |  |  |
Production costs | 29 |  |  | 147 |  |  | 5,283 |
Depletion and amortization | 66 |  |  | 69 |  |  | 42 |
Exploration | — |  |  | — |  |  | — |
Abandoned and impaired properties | — |  |  | — |  |  | — |
Results of operations of oil and gas producing activities | $ | 193 |  |  | $ | (26 | ) |  | $ | (3,306 | )
Company’s share of Laramie Energy: |  |  |  |  |
Revenue |  |  |  |  |
Oil and gas revenues | $ | 66,783 |  |  | $ | 43,607 |  |  | $ | 14,217 |
Expenses |  |  |  |  |
Production costs | 32,606 |  |  | 27,750 |  |  | 11,047 |
Impairment of unproved properties | — |  |  | — |  |  | 3,977 |
Depletion, depreciation, and amortization | 21,277 |  |  | 17,534 |  |  | 8,226 |
Results of operations of oil and gas producing activities | $ | 12,900 |  |  | $ | (1,677 | ) |  | $ | (9,033 | )
Total results of operations of oil and gas producing activities | $ | 13,093 |  |  | $ | (1,703 | ) |  | $ | (12,339 | )

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- Definition Tabular disclosure of aggregate capitalized costs relating to an enterprise's oil and gas producing activities and the aggregate related accumulated depreciation, depletion, amortization, and valuation allowances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61901-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=34713648&loc=d3e63019-109448 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61929-109447 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61926-109447 + Details
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