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ASSET RETIREMENT OBLIGATIONS AND RESTRICTED CASH (Tables)
 12 Months Ended
Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation
The following table summarizes the Company’s asset retirement obligations:
 
December 31, 2018
 
December 31, 2017
Asset retirement obligation, beginning of period
$
18,280

 
$
17,033

 Revision of estimate
(662
)
 
249

 Accretion of liabilities
1,835

 
1,733

 Settlements
(349
)
 
(735
)
Asset retirement obligation, end of period
$
19,104

 
$
18,280

Asset retirement obligation:
 
 
 
 Current
$
270

 
$
32

 Non-current
18,834

 
18,248

Asset retirement obligation, end of period
$
19,104

 
$
18,280
Schedule of Restricted Cash and Cash Equivalents
The following table summarizes the Company’s restricted cash:
 
December 31, 2018
 
December 31, 2017
Restricted cash, beginning of period
$
22,127

 
$
23,175

 Refunds of collateral
(2,592
)
 
(14,657
)
 Additional collateral posted
117

 
13,609

Restricted cash, end of period
$
19,652

 
$
22,127