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ASSET RETIREMENT OBLIGATION - Summary of Asset Retirement Obligation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
ASSET RETIREMENT OBLIGATIONS          
Balance, beginning of period     $ 6,203 $ 5,731 $ 5,731
Liabilities settled     (334)   (521)
Accretion expense $ 197 $ 133 353 $ 401 993
Balance, end of period 6,222   6,222   6,203
Less: Current portion (895)   (895)   (708)
Non-current Portion $ 5,327   $ 5,327   $ 5,495