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ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH (Tables) | 9 Months Ended
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Sep. 30, 2019
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Change in Asset Retirement Obligation | The following table summarizes the Company’s asset retirement obligations:
| September 30, 2019 |  | December 31, 2018
Asset retirement obligation, beginning of period | $ | 19,104 |  |  | $ | 18,280 |
Revision of estimate | 151 |  |  | (662 | )
Accretion of liabilities | 1,478 |  |  | 1,835 |
Settlements | — |  |  | (349 | )
Asset retirement obligation, end of period | $ | 20,733 |  |  | $ | 19,104 |
Asset retirement obligation: |  |  |
Current | $ | 32 |  |  | $ | 270 |
Non-current | 20,701 |  |  | 18,834 |
Asset retirement obligation, end of period | $ | 20,733 |  |  | $ | 19,104 |
Schedule of Restricted Cash and Cash Equivalents | Cash, cash equivalents and restricted cash are included in the following accounts at September 30, 2019 and December 31, 2018:
| September 30, 2019 |  | December 31, 2018
Cash and cash equivalents | $ | 14,728 |  |  | $ | 14,640 |
Restricted cash included in other long-term assets | 20,054 |  |  | 19,652 |
Total cash, cash equivalents and restricted cash | $ | 34,782 |  |  | $ | 34,292 |
The following table summarizes the Company’s restricted cash:
| September 30, 2019 |  | December 31, 2018
Restricted cash, beginning of period | $ | 19,652 |  |  | $ | 22,127 |
Additional collateral posted | 402 |  |  | 117 |
Refunds of collateral | — |  |  | (2,592 | )
Restricted cash, end of period | $ | 20,054 |  |  | $ | 19,652 |

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