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ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH (Tables)
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation
The following table summarizes the Company’s asset retirement obligations:
 
December 31, 2019
 
December 31, 2018
Asset retirement obligation, beginning of period
$
19,104

 
$
18,280

 Revision of estimate
(2,063
)
 
(662
)
 Accretion of liabilities
1,931

 
1,835

 Settlements
—

 
(349
)
Asset retirement obligation, end of period
$
18,972

 
$
19,104

Asset retirement obligation:
 
 
 
 Current
$
46

 
$
270

 Non-current
18,926

 
18,834

Asset retirement obligation, end of period
$
18,972

 
$
19,104
Schedule of Restricted Cash and Cash Equivalents
The following table summarizes the Company’s restricted cash:
 
December 31, 2019
 
December 31, 2018
Restricted cash, beginning of period
$
19,652

 
$
22,127

 Refunds of collateral
—

 
(2,592
)
 Additional collateral posted
429

 
117

Restricted cash, end of period
$
20,081

 
$
19,652