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)

v3.20.4
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, 2020
Dec. 31, 2019
Dec. 31, 2018
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward]      
Beginning balance $ 53,171 $ 145,811 $ 88,202
Sales and transfers of gas and condensate produced, net of production costs (20,211) (21,704) (1,773)
Net changes in prices and production costs (58,136) (134,366) 27,530
Extensions, discoveries, additions and improved recovery, net of related costs 0 2,019 13,334
Development costs incurred 0 23,485 545
Revisions of estimated development costs 0 6,165 9,663
Revisions of previous quantity estimates 26,133 (12,660) 12,991
Accretion of discount 5,725 17,821 11,112
Net change in income taxes 4,077 28,316 (9,472)
Purchases of reserves in place 0 0 844
Sales of reserves in place 0 0 0
Changes in timing and other (3,874) (1,716) (7,165)
Ending balance $ 6,885 $ 53,171 $ 145,811