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ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH (Tables) | 6 Months Ended
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Jun. 30, 2021
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Change in Asset Retirement Obligation | The following table summarizes the Company’s asset retirement obligations:
| June 30, 2021 |  | December 31, 2020
Asset retirement obligation, beginning of period | $ | 13,038 |  |  | $ | 18,972 |
Revision of estimate | (39) |  |  | (7,845) |
Accretion of liabilities | 672 |  |  | 1,911 |
Asset retirement obligation, end of period | $ | 13,671 |  |  | $ | 13,038 |
Asset retirement obligation: |  |  |
Current | $ | 131 |  |  | $ | 131 |
Non-current | 13,540 |  |  | 12,907 |
Asset retirement obligation, end of period | $ | 13,671 |  |  | $ | 13,038 |
Schedule of Restricted Cash and Cash Equivalents | The following table summarizes the Company’s restricted cash:
| June 30, 2021 |  | December 31, 2020
Restricted cash, beginning of period | $ | 20,817 |  |  | $ | 20,081 |
Additional collateral posted | 23 |  |  | 768 |
Refunds of collateral | — |  |  | (32) |
Restricted cash, end of period | $ | 20,840 |  |  | $ | 20,817 |
Cash, cash equivalents and restricted cash are included in the following accounts at June 30, 2021 and December 31, 2020:
| June 30, 2021 |  | December 31, 2020
Cash and cash equivalents | $ | 79,016 |  |  | $ | 20,168 |
Restricted cash included in other long-term assets | 20,840 |  |  | 20,817 |
Total cash, cash equivalents and restricted cash | $ | 99,856 |  |  | $ | 40,985 |

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