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Supplemental Information On Oil And Gas Exploration And Production Activities (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2020
Extractive Industries [Abstract]  
Costs Incurred in Oil and Gas Producing Activities
The Company’s oil and natural gas activities for 2020 and 2019 were entirely within the United States of America. Costs incurred in oil and natural gas producing activities were as follows (in thousands):
 Years Ended December 31,
 20202019
Acquisition cost (1):
  
Proved$— $(141)
Unproved— (125)
Exploration costs:
Abandonment costs— 653 
Geological and geophysical298 — 
Development costs67,550 210,520 
Total additions$67,848 $210,907 
(1)Acquisition costs incurred during 2019 consisted primarily of purchase price adjustments related to 2018 acquisitions.
Summary of Capitalized Costs, Impairment, and Depreciation, Depletion and Amortization
Capitalized costs, impairment, and depreciation, depletion and amortization relating to the Company’s oil and natural gas properties producing activities, all of which are conducted within the continental United States as of December 31, 2020 and 2019, are summarized below (in thousands):
 December 31,
 20202019
Oil and gas properties, successful efforts method:  
Proved properties$1,118,148 $1,046,208 
Accumulated impairment to proved properties(100,652)(75,400)
Proved properties, net of accumulated impairments1,017,496 970,808 
Unproved properties301,083 305,961 
Accumulated impairment to Unproved properties(67,316)(45,690)
Unproved properties, net of accumulated impairments233,767 260,271 
Land5,382 5,382 
Total oil and gas properties, net of accumulated impairments1,256,645 1,236,461 
Accumulated depreciation, depletion and amortization(291,213)(195,567)
Net oil and gas properties$965,432 $1,040,894 
Summary of Changes in Quantities of Proved Oil and Natural Gas Reserves
A summary of the Company’s changes in quantities of proved oil, natural gas and NGLs reserves for the years ended December 31, 2020 and 2019 are as follows:      
Oil
(MBbl)		Natural Gas
(MMcf)		NGLs
(MBbl)		Total
(MBOE)
Balance - December 31, 201859,034 113,217 20,943 98,847 
Extensions and discoveries3,598 4,476 721 5,065 
Sales of minerals in place(31)(4)(1)(32)
Production(3,086)(4,760)(1,022)(4,902)
Revision to previous estimates(6,865)(4,939)3,047 (4,642)
Balance - December 31, 201952,650 107,990 23,688 94,336 
Extensions and discoveries420 1,258 230 860 
Production(3,180)(7,282)(1,237)(5,630)
Revision to previous estimates(9,800)9,249 (2,432)(10,691)
Balance - December 31, 202040,090 111,215 20,249 78,875 
Proved developed reserves:
December 31, 201814,325 26,110 4,969 23,646 
December 31, 201918,220 35,120 7,447 31,521 
December 31, 202018,878 55,764 10,125 38,298 
Proved undeveloped reserves:
December 31, 201844,709 87,107 15,974 75,201 
December 31, 201934,430 72,870 16,241 62,815 
December 31, 202021,212 55,450 10,123 40,577 

The table below presents the quantities of proved oil, natural gas and NGLs reserves attributable to noncontrolling interests as of December 31, 2020 and 2019:
As of December 31, 2020Oil
(MBbl)		Natural Gas
(MMcf)		NGLs
(MBbl)		Total
(MBOE)
Proved developed10,113 29,873 5,424 20,516 
Proved undeveloped11,363 29,704 5,423 21,737 
Total proved21,476 59,577 10,847 42,253 
As of December 31, 2019Oil
(MBbl)		Natural Gas
(MMcf)		NGLs
(MBbl)		Total
(MBOE)
Proved developed9,933 19,146 4,060 17,183 
Proved undeveloped18,769 39,724 8,853 34,243 
Total proved28,702 58,870 12,913 51,426 
Changes in PUD Reserves
Changes in PUD reserves for the years ended December 31, 2020 and 2019 were as follows (in MBOE): 
Proved undeveloped reserves at December 31, 2018 (1)75,201 
Conversions to developed(10,254)
Extensions and discoveries1,230 
Revision to previous estimates(3,362)
Proved undeveloped reserves at December 31, 2019 (2)62,815 
Conversions to developed(8,200)
Revision to previous estimates(14,038)
Proved undeveloped reserves at December 31, 2020 (3)40,577 
(1)Includes 41,560 MBOE attributable to noncontrolling interests.
(2)Includes 34,243 MBOE attributable to noncontrolling interests.
(3)Includes 21,737 MBOE attributable to noncontrolling interests.
Schedule Of Standardized Measure
The Standardized Measure is as follows (in thousands):
 December 31,
 20202019
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 flows948,180 1,535,888 
10% annual discount for estimated timing of cash flows(487,327)(746,311)
Standardized measure of discounted future net cash flows (1)
$460,853 $789,577 
(1)At December 31, 2020 and 2019, the portion of the standardized measure of discounted future net cash flows attributable to noncontrolling interests was $246.9 million and $430.4 million, respectively.
Schedule Of Changes In Standardized Measure Of Discontinued Future Net Cash Flows Relating To Proved Oil And Natural Gas Reserves
The following is a summary of the changes in the Standardized Measure for the Company’s proved oil and natural gas reserves during each of the years in the two-year period ended December 31, 2020 (in thousands):
 December 31,
 20202019
Beginning of year$789,577 $959,452 
Sales of oil and gas produced, net of production costs(105,555)(150,708)
Sales of minerals in place14 (458)
Net changes in prices and production costs(381,769)(565,240)
Extensions, discoveries, and improved recoveries14,644 127,182 
Changes in income taxes, net17,826 12,697 
Previously estimated development costs incurred during the period66,788 210,520 
Net changes in future development costs258,741 118,348 
Revisions of previous quantity estimates(273,781)(35,588)
Accretion of discount81,999 107,432 
Changes in timing of estimated cash flows and other(7,631)5,940 
End of year (1)
$460,853 $789,577 
(1)At December 31, 2020 and 2019, the portion of the standardized measure of discounted future net cash flows attributable to noncontrolling interests was $246.9 million and $430.4 million, respectively.