Supplemental Information On Oil And Gas Exploration And Production Activities (Unaudited) - Schedule Of Standardized Measure (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Extractive Industries [Abstract]
Future cash inflows	$ 3,250,868	$ 4,479,757
Future production costs	(1,027,464)	(1,013,131)
Future development costs	(628,692)	(963,536)
Future income tax expense	(58,824)	(90,570)
Future net cash flows	1,535,888	2,412,520
10% annual discount for estimated timing of cash flows	(746,311)	(1,453,068)
Standardized measure of discounted future net cash flows	789,577	959,452	$ 592,700
Standardized measure of discounted future net cash flows attributable to noncontrolling interests	$ 430,400	$ 530,200