Annual report pursuant to Section 13 and 15(d)

SUPPLEMENTAL DISCLOSURES ABOUT NATURAL GAS PRODUCING ACTIVITIES - Results of Operations for Natural Gas & Condensate Producing Activities (Details)

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SUPPLEMENTAL DISCLOSURES ABOUT NATURAL GAS PRODUCING ACTIVITIES - Results of Operations for Natural Gas & Condensate Producing Activities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Extractive Industries [Abstract]      
Natural gas sales $ 30,441 $ 28,774 $ 4,423
Operating costs 15,814 14,923 11,251
Depreciation, depletion and amortization 16,703 19,736 1,228
Impairment charge 81,065 0 2,699
Total operating costs and expenses 113,582 34,659 15,178
Results of operations $ (83,141) $ (5,885) $ (10,755)