Annual report pursuant to Section 13 and 15(d)

SUPPLEMENTAL DISCLOSURES ABOUT NATURAL GAS PRODUCING ACTIVITIES - Changes in Standardized Measure of Discounted Future Net Cash Flows Related to Proved Natural Gas & Condensate Reserves (Details)

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SUPPLEMENTAL DISCLOSURES ABOUT NATURAL GAS PRODUCING ACTIVITIES - Changes in Standardized Measure of Discounted Future Net Cash Flows Related to Proved Natural Gas & Condensate Reserves (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward]      
Beginning balance $ 6,885 $ 53,171 $ 145,811
Sales and transfers of gas and condensate produced, net of production costs (39,806) (20,211) (21,704)
Net changes in prices and production costs 110,850 (58,136) (134,366)
Extensions, discoveries, additions and improved recovery, net of related costs 255,246 0 2,019
Development costs incurred 0 0 23,485
Revisions of estimated development costs 10,643 0 6,165
Revisions of previous quantity estimates 35,012 26,133 (12,660)
Accretion of discount 688 5,725 17,821
Net change in income taxes (27,455) 4,077 28,316
Purchases of reserves in place 0 0 0
Sales of reserves in place 0 0 0
Changes in timing and other 12,140 (3,874) (1,716)
Ending balance $ 364,203 $ 6,885 $ 53,171