Supplemental Information On Oil And Gas Exploration And Production Activities (Unaudited) - Schedule Of Standardized Measure (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Extractive Industries [Abstract]
Future cash inflows	$ 1,902,073	$ 3,250,868
Future production costs	(633,248)	(1,027,464)
Future development costs	(285,088)	(628,692)
Future income tax expense	(35,557)	(58,824)
Future net cash flows	948,180	1,535,888
10% annual discount for estimated timing of cash flows	(487,327)	(746,311)
Standardized measure of discounted future net cash flows	460,853	789,577	$ 959,452
Standardized measure of discounted future net cash flows attributable to noncontrolling interests	$ 246,900	$ 430,400