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, 2019
Dec. 31, 2018
Dec. 31, 2017
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward]      
Beginning balance $ 145,811 $ 88,202 $ 0
Sales and transfers of gas and condensate produced, net of production costs (21,704) (1,773) (265)
Net changes in prices and production costs (134,366) 27,530 0
Extensions, discoveries, additions and improved recovery, net of related costs 2,019 13,334 0
Development costs incurred 23,485 545 0
Revisions of estimated development costs 6,165 9,663 0
Revisions of previous quantity estimates (12,660) 12,991 0
Accretion of discount 17,821 11,112 0
Net change in income taxes 28,316 (9,472) (22,921)
Purchases of reserves in place 0 844 111,388
Sales of reserves in place 0 0 0
Changes in timing and other (1,716) (7,165)  
Ending balance $ 53,171 $ 145,811 $ 88,202