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ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH (Tables) | 9 Months Ended
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Sep. 30, 2020
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Change in Asset Retirement Obligation | The following table summarizes the Company’s asset retirement obligations:
| September 30, 2020 |  | December 31, 2019
Asset retirement obligation, beginning of period | $ | 18,972 |  |  | $ | 19,104 |
Revision of estimate | — |  |  | (2,063) |
Accretion of liabilities | 1,434 |  |  | 1,931 |
Asset retirement obligation, end of period | $ | 20,406 |  |  | $ | 18,972 |
Asset retirement obligation: |  |  |
Current | $ | 46 |  |  | $ | 46 |
Non-current | 20,360 |  |  | 18,926 |
Asset retirement obligation, end of period | $ | 20,406 |  |  | $ | 18,972 |
Schedule of Restricted Cash and Cash Equivalents | The following table summarizes the Company’s restricted cash:
| September 30, 2020 |  | December 31, 2019
Restricted cash, beginning of period | $ | 20,081 |  |  | $ | 19,652 |
Additional collateral posted | 179 |  |  | 429 |
Refunds of collateral | (32) |  |  | — |
Restricted cash, end of period | $ | 20,228 |  |  | $ | 20,081 |
Cash, cash equivalents and restricted cash are included in the following accounts at September 30, 2020 and December 31, 2019:
| September 30, 2020 |  | December 31, 2019
Cash and cash equivalents | $ | 26,584 |  |  | $ | 12,810 |
Restricted cash included in other long-term assets | 20,228 |  |  | 20,081 |
Total cash, cash equivalents and restricted cash | $ | 46,812 |  |  | $ | 32,891 |

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