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ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH (Tables) | 3 Months Ended
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Mar. 31, 2019
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Change in Asset Retirement Obligation | The following table summarizes the Company’s asset retirement obligations:
| March 31, 2019 |  | December 31, 2018
Asset retirement obligation, beginning of period | $ | 19,104 |  |  | $ | 18,280 |
Revision of estimate | — |  |  | (662 | )
Accretion of liabilities | 513 |  |  | 1,835 |
Settlements | — |  |  | (349 | )
Asset retirement obligation, end of period | $ | 19,617 |  |  | $ | 19,104 |
Asset retirement obligation: |  |  |
Current | $ | 270 |  |  | $ | 270 |
Non-current | 19,347 |  |  | 18,834 |
Asset retirement obligation, end of period | $ | 19,617 |  |  | $ | 19,104 |
Schedule of Restricted Cash and Cash Equivalents | The following table summarizes the Company’s restricted cash:
| March 31, 2019 |  | December 31, 2018
Restricted cash, beginning of period | $ | 19,652 |  |  | $ | 22,127 |
Additional collateral posted | — |  |  | 117 |
Refunds of collateral | 30 |  |  | (2,592 | )
Restricted cash, end of period | $ | 19,682 |  |  | $ | 19,652 |
Cash, cash equivalents and restricted cash are included in the following accounts at March 31, 2019 and December 31, 2018:
| March 31, 2019 |  | December 31, 2018
Cash and cash equivalents | $ | 15,310 |  |  | $ | 14,640 |
Restricted cash included in other long-term assets | 19,682 |  |  | 19,652 |
Total cash, cash equivalents and restricted cash | $ | 34,992 |  |  | $ | 34,292 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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