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ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH (Tables)

6 Months Ended

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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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.

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Tabular disclosure of cash and cash equivalents restricted as to withdrawal or usage.

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