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ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH (Tables) | 12 Months Ended
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Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Change in Asset Retirement Obligation | The following table summarizes the Company’s asset retirement obligations:
| December 31, 2017 |  | December 31, 2016
Asset retirement obligation, beginning of period | $ | 17,033 |  |  | $ | 8,573 |
Revision of estimate | 249 |  |  | 4,186 |
Acquired in asset acquisitions or business combinations | — |  |  | 5,454 |
Accretion of liabilities | 1,733 |  |  | 906 |
Settlements | (735 | ) |  | (2,086 | )
Asset retirement obligation, end of period | $ | 18,280 |  |  | $ | 17,033 |
Asset retirement obligation: |  |  |
Current | $ | 32 |  |  | $ | 32 |
Non-current | 18,248 |  |  | 17,001 |
Asset retirement obligation, end of period | $ | 18,280 |  |  | $ | 17,033 |
Schedule of Restricted Cash and Cash Equivalents | The following table summarizes the Company’s restricted cash:
| December 31, 2017 |  | December 31, 2016
Restricted cash, beginning of period | $ | 23,175 |  |  | $ | 12,980 |
Restricted cash from acquisitions | — |  |  | 4,532 |
Refunds of collateral | (14,657 | ) |  | — |
Additional collateral posted | 13,609 |  |  | 5,663 |
Restricted cash, end of period | $ | 22,127 |  |  | $ | 23,175 |

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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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- Definition Tabular disclosure of cash and cash equivalents restricted as to withdrawal or usage. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + Details
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