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Supplemental Oil and Gas Disclosures (Tables) | 12 Months Ended
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Dec. 31, 2018
Extractive Industries [Abstract] |
Oil And Gas Property Successful Effort Method | Capitalized costs related to oil and gas activities are as follows (in thousands):
| December 31,
| 2018 |  | 2017
Company |  |  |
Unproved properties | $ | — |  |  | $ | — |
Proved properties | 400 |  |  | 400 |
| 400 |  |  | 400 |
Accumulated depreciation and depletion | (293 | ) |  | (275 | )
Total | $ | 107 |  |  | $ | 125 |
Company’s share of Laramie Energy |  |  |
Unproved properties | $ | 16,379 |  |  | $ | 13,728 |
Proved properties | 473,763 |  |  | 382,789 |
| 490,142 |  |  | 396,517 |
Accumulated depreciation, depletion, and amortization | (150,075 | ) |  | (111,119 | )
Total | $ | 340,067 |  |  | $ | 285,398 |
Cost Incurred in Oil and Gas Property Acquisition, Exploration, and Development Activities Disclosure | Costs incurred in oil and gas activities including costs associated with assets retirement obligations, are as follows (in thousands):
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Company |  |  |  |  |
Development costs—other | $ | — |  |  | $ | — |  |  | $ | — |
Total | $ | — |  |  | $ | — |  |  | $ | — |
Company’s share of Laramie Energy |  |  |  |  |
Acquisition costs | $ | — |  |  | $ | — |  |  | $ | 65,324 |
Development costs—other | 50,867 |  |  | 49,273 |  |  | 12,805 |
Total | $ | 50,867 |  |  | $ | 49,273 |  |  | $ | 78,129 |
Capitalized Exploratory Well Costs, Roll Forward | 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,
| 2018 |  | 2017 |  | 2016
Company |  |  |  |  |
Revenue |  |  |  |  |
Oil and gas revenues | $ | 51 |  |  | $ | 288 |  |  | $ | 190 |
Expenses |  |  |  |  |
Production costs | 191 |  |  | 29 |  |  | 147 |
Depletion and amortization | 17 |  |  | 66 |  |  | 69 |
Exploration | — |  |  | — |  |  | — |
Abandoned and impaired properties | — |  |  | — |  |  | — |
Results of operations of oil and gas producing activities | $ | (157 | ) |  | $ | 193 |  |  | $ | (26 | )
Company’s share of Laramie Energy |  |  |  |  |
Revenue |  |  |  |  |
Oil and gas revenues | $ | 93,493 |  |  | $ | 66,783 |  |  | $ | 43,607 |
Expenses |  |  |  |  |
Production costs | 42,706 |  |  | 32,606 |  |  | 27,750 |
Depletion, depreciation, and amortization | 26,819 |  |  | 21,277 |  |  | 17,534 |
Results of operations of oil and gas producing activities | $ | 23,968 |  |  | $ | 12,900 |  |  | $ | (1,677 | )
Total results of operations of oil and gas producing activities | $ | 23,811 |  |  | $ | 13,093 |  |  | $ | (1,703 | )

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