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Supplemental Oil and Gas Disclosures (Unaudited) | 12 Months Ended
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Dec. 31, 2019
Extractive Industries [Abstract] |
Supplemental Oil and Gas Disclosures (Unaudited) | Supplemental Oil and Gas Disclosures (Unaudited) 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 |
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 |
For the years ended December 31, 2019, 2018, and 2017, 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, 2019, 2018, and 2017 that were being evaluated. As of December 31, 2019 and 2018, we had no significant capitalized costs related to our other non-operated natural gas and oil interests. For the years ended December 31, 2019 and 2018, we incurred no significant costs related to our other non-operated natural gas and oil interests. 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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