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ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH (Tables)

12 Months Ended

Dec. 31, 2020

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Change in Asset Retirement Obligation

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

			December 31, 2020						December 31, 2019
Asset retirement obligation, beginning of period			$	18,972					$	19,104
Revision of estimate			(7,845)						(2,063)
Accretion of liabilities			1,911						1,931
Settlements			—						—
Asset retirement obligation, end of period			$	13,038					$	18,972
Asset retirement obligation:
Current			$	131					$	46
Non-current			12,907						18,926
Asset retirement obligation, end of period			$	13,038					$	18,972

Schedule of Restricted Cash and Cash Equivalents

The following table summarizes the Company’s restricted cash:

			December 31, 2020						December 31, 2019
Restricted cash, beginning of period			$	20,081					$	19,652
Additional collateral posted			768						429
Refunds of collateral			(32)						—
Restricted cash, end of period			$	20,817					$	20,081

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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.

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

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