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ASSET RETIREMENT OBLIGATIONS (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]  
Balance, beginning of year $ 3,653
Additional liability incurred 54
Obligations on assets sold (14)
Revisions in estimated cash flows 362
Accretion expense 97
Balance, end of year $ 4,152