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Supplemental Oil and Gas Disclosures (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Extractive Industries [Abstract] |
Oil and Gas Property Successful Effort Method | Our share of Laramie Energy's capitalized costs related to oil and gas activities are as follows (in thousands):
| December 31,
| 2019 |  | 2018
Company’s share of Laramie Energy |  |  |
Unproved properties | $ | 14,722 |  |  | $ | 16,379 |
Proved properties | 211,083 |  |  | 473,763 |
| 225,805 |  |  | 490,142 |
Accumulated depreciation, depletion, and amortization | (63,791 | ) |  | (150,075 | )
Total | $ | 162,014 |  |  | $ | 340,067 |
Cost Incurred in Oil and Gas Property Acquisition, Exploration, and Development Activities Disclosure | Our share of Laramie Energy's costs incurred in oil and gas activities including costs associated with assets retirement obligations, are as follows (in thousands):
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Company’s share of Laramie Energy |  |  |  |  |
Acquisition costs | $ | — |  |  | $ | — |  |  | $ | — |
Development costs—other | 32,748 |  |  | 50,867 |  |  | 49,273 |
Total | $ | 32,748 |  |  | $ | 50,867 |  |  | $ | 49,273 |
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,
| 2019 |  | 2018 |  | 2017
Company |  |  |  |  |
Revenue |  |  |  |  |
Oil and gas revenues | $ | 156 |  |  | $ | 51 |  |  | $ | 288 |
Expenses |  |  |  |  |
Production costs | 87 |  |  | 191 |  |  | 29 |
Depletion and amortization | 6 |  |  | 17 |  |  | 66 |
Results of operations of oil and gas producing activities | $ | 63 |  |  | $ | (157 | ) |  | $ | 193 |
Company’s share of Laramie Energy |  |  |  |  |
Revenue |  |  |  |  |
Oil and gas revenues | $ | 89,073 |  |  | $ | 93,493 |  |  | $ | 66,783 |
Expenses |  |  |  |  |
Production costs | 41,446 |  |  | 42,706 |  |  | 32,606 |
Impairment of proved properties (1) | 163,401 |  |  | — |  |  | — |
Depletion, depreciation, and amortization | 38,011 |  |  | 26,819 |  |  | 21,277 |
Results of operations of oil and gas producing activities | $ | (153,785 | ) |  | $ | 23,968 |  |  | $ | 12,900 |
Total results of operations of oil and gas producing activities | $ | (153,722 | ) |  | $ | 23,811 |  |  | $ | 13,093 |
__________________________________________________ (1) Please read Note 3—Investment in Laramie Energy, LLC for further disclosures and information on Laramie Energy's impairment of proved properties.

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