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, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Extractive Industries [Abstract]        
Future cash inflows $ 534,577 $ 676,454 $ 777,711  
Future production costs (102,268) (105,341) (144,991)  
Future development costs (287,111) (264,239) (331,297)  
Future income tax provisions (6,612) (54,564) (52,212)  
Future net cash flows 138,586 252,310 249,211  
Less effect of a 10% discount factor (85,415) (106,499) (161,009)  
Standardized measure of discounted future net cash flows $ 53,171 $ 145,811 $ 88,202 $ 0