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ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH (Tables)

6 Months Ended

Jun. 30, 2018

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Change in Asset Retirement Obligation

The following table summarizes the Company’s asset retirement obligations:

	June 30, 2018				December 31, 2017
Asset retirement obligation, beginning of period	$	18,280			$	17,033
Revision of estimate	—				249
Accretion of liabilities	917				1,733
Settlements	(151		)		(735		)
Asset retirement obligation, end of period	$	19,046			$	18,280
Asset retirement obligation:
Current	$	32			$	32
Non-current	19,014				18,248
Asset retirement obligation, end of period	$	19,046			$	18,280

Schedule of Restricted Cash and Cash Equivalents

The following table summarizes the Company’s restricted cash:

	June 30, 2018				December 31, 2017
Restricted cash, beginning of period	$	22,127			$	23,175
Additional collateral posted	102				13,609
Refunds of collateral	(635		)		(14,657		)
Restricted cash, end of period	$	21,594			$	22,127

Cash, cash equivalents and restricted cash are included in the following accounts at June 30, 2018 and December 31, 2017:

	June 30, 2018				December 31, 2017
Cash and cash equivalents	$	43,239			$	18,574
Restricted cash included in other long-term assets	21,594				22,127
Total cash, cash equivalents and restricted cash	$	64,833			$	40,701

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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

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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

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