Annual report pursuant to Section 13 and 15(d)

SUPPLEMENTAL DISCLOSURES ABOUT NATURAL GAS PRODUCING ACTIVITIES - 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 - Standardized Measure of Discounted Future Net Cash Flows Related to Proved Natural Gas & Condensate Reserves (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Extractive Industries [Abstract]        
Future cash inflows $ 945,651 $ 132,563 $ 534,577  
Future production costs (133,909) (34,624) (102,268)  
Future development costs (211,836) (71,557) (287,111)  
Future income tax provisions (54,401) 0 (6,612)  
Future net cash flows 545,505 26,382 138,586  
Less effect of a 10% discount factor (181,302) (19,497) (85,415)  
Standardized measure of discounted future net cash flows $ 364,203 $ 6,885 $ 53,171 $ 145,811