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, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Extractive Industries [Abstract]        
Future cash inflows $ 132,563 $ 534,577 $ 676,454  
Future production costs (34,624) (102,268) (105,341)  
Future development costs (71,557) (287,111) (264,239)  
Future income tax provisions 0 (6,612) (54,564)  
Future net cash flows 26,382 138,586 252,310  
Less effect of a 10% discount factor (19,497) (85,415) (106,499)  
Standardized measure of discounted future net cash flows $ 6,885 $ 53,171 $ 145,811 $ 88,202