Annual report pursuant to Section 13 and 15(d)

SUPPLEMENTAL DISCLOSURES ABOUT NATURAL GAS PRODUCING ACTIVITIES - Natural Gas & Condensate Reserve Quantity Information (Details)

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SUPPLEMENTAL DISCLOSURES ABOUT NATURAL GAS PRODUCING ACTIVITIES - Natural Gas & Condensate Reserve Quantity Information (Details)
MMcfe in Thousands, MMcf in Thousands, MBbls in Thousands
12 Months Ended
Dec. 31, 2020
MMcfe
Bcfe
MMcf
MBbls
Dec. 31, 2019
MMcfe
Bcfe
MMcf
MBbls
Dec. 31, 2018
MMcfe
Bcfe
MMcf
MBbls
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Extensions, discoveries and other additions | Bcfe   13 85
Revisions of previous estimates | Bcfe 152 4 22
Purchases of reserves-in-place | Bcfe     1
Gas      
Proved Developed and Undeveloped Reserves [Roll Forward]      
Proved reserves, beginning balance | MMcf 268,538 264,854 327,118
Extensions, discoveries and other additions | MMcf 0 12,848 22,481
Revisions of previous estimates | MMcf (152,132) 4,737 (84,061)
Production | MMcf (16,898) (13,901) (1,399)
Sale of reserves-in-place | MMcf 0 0 0
Purchases of reserves-in-place | MMcf 0 0 715
Proved reserves, ending balance | MMcf 99,508 268,538 264,854
Proved developed reserves: | MMcf 26,593 30,699 17,522
Proved undeveloped reserves: | MMcf 72,915 237,839 247,332
Condensate      
Proved Developed and Undeveloped Reserves [Roll Forward]      
Proved reserves, beginning balance | MBbls 0 7 10
Extensions, discoveries and other additions | MBbls 0 0 0
Revisions of previous estimates | MBbls 0 (6) (2)
Production | MBbls 0 (1) (1)
Sale of reserves-in-place | MBbls 0 0 0
Purchases of reserves-in-place | MBbls 0 0 0
Proved reserves, ending balance | MBbls 0 0 7
Proved developed reserves: | MBbls 0 0 7
Proved undeveloped reserves: | MBbls 0 0 0
Gas Equivalent      
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]      
Proved reserve (energy), beginning balance | MMcfe 268,538 264,899 327,180
Extensions, discoveries and other additions | MMcfe 0 12,848 22,481
Revisions of previous estimates | MMcfe (152,132) 4,696 (84,072)
Production | MMcfe (16,898) (13,905) (1,405)
Sale of reserves-in-place | MMcfe 0 0 0
Purchases of reserves-in-place | MMcfe 0 0 715
Proved reserve (energy), ending balance | MMcfe 99,508 268,538 264,899
Proved developed reserves: | MMcfe 26,593 30,699 17,567
Proved undeveloped reserves: | MMcfe 72,915 237,839 247,332