Annual report pursuant to Section 13 and 15(d)

SUPPLEMENTAL DISCLOSURES ABOUT NATURAL GAS PRODUCING ACTIVITIES - Capitalized Costs Related to Natural Gas Producing Activities (Details)

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SUPPLEMENTAL DISCLOSURES ABOUT NATURAL GAS PRODUCING ACTIVITIES - Capitalized Costs Related to Natural Gas Producing Activities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Extractive Industries [Abstract]      
Proved properties $ 62,718 $ 142,494 $ 101,459
Unproved properties 0 0 10,204
Gross capitalized costs 62,718 142,494 111,663
Accumulated DD&A (37,639) (21,010) (1,335)
Net capitalized costs $ 25,079 $ 121,484 $ 110,328