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ASSET RETIREMENT OBLIGATION (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Asset retirement obligation [Roll Forward]    
Beginning Asset Retirement Obligation $ 12,501 $ 9,128
Liabilities Acquired During the Period 2,680 1,737
Liabilities Incurred During the Period 1,361 1,118
Accretion of Discount on Asset Retirement Obligations 973 683
Liabilities Settled During the Period (216) (165)
Ending Asset Retirement Obligation $ 17,299 $ 12,501