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Supplemental Crude Oil and Natural Gas Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Supplemental Crude Oil and Natural Gas Information [Abstract]  
Proved crude oil and natural gas reserves
Proved crude oil and natural gas reserves
Changes in proved reserves were as follows for the periods presented:
 
 
Crude Oil
(MBbls)
 
Natural Gas
(MMcf)
 
Total
(MBoe)
Proved reserves as of December 31, 2016
 
643,228

 
3,789,818

 
1,274,864

Revisions of previous estimates
 
(77,779
)
 
(25,390
)
 
(82,012
)
Extensions, discoveries and other additions
 
129,895

 
661,867

 
240,206

Production
 
(50,536
)
 
(228,159
)
 
(88,562
)
Sales of minerals in place
 
(4,365
)
 
(64,989
)
 
(15,197
)
Purchases of minerals in place
 
506

 
7,134

 
1,696

Proved reserves as of December 31, 2017
 
640,949

 
4,140,281

 
1,330,995

Revisions of previous estimates
 
(76,994
)
 
(1,153,555
)
 
(269,253
)
Extensions, discoveries and other additions
 
253,066

 
1,871,777

 
565,030

Production
 
(61,384
)
 
(284,730
)
 
(108,839
)
Sales of minerals in place
 
(2,154
)
 
(35,142
)
 
(8,011
)
Purchases of minerals in place
 
3,613

 
52,983

 
12,443

Proved reserves as of December 31, 2018
 
757,096

 
4,591,614

 
1,522,365

Revisions of previous estimates
 
(88,307
)
 
(363,239
)
 
(148,848
)
Extensions, discoveries and other additions
 
162,710

 
1,213,947

 
365,034

Production
 
(72,267
)
 
(311,865
)
 
(124,244
)
Sales of minerals in place
 
(803
)
 
(6,224
)
 
(1,840
)
Purchases of minerals in place
 
1,758

 
30,238

 
6,798

Proved reserves as of December 31, 2019
 
760,187

 
5,154,471

 
1,619,265
Schedule of proved developed and undeveloped oil and gas reserve quantities
The following reserve information sets forth the estimated quantities of proved developed and proved undeveloped crude oil and natural gas reserves of the Company as of December 31, 2019, 2018 and 2017:
 
 
December 31,
 
 
2019
 
2018
 
2017
Proved Developed Reserves
 
 
 
 
 
 
Crude oil (MBbl)
 
336,405

 
347,825

 
318,707

Natural Gas (MMcf)
 
2,226,117

 
1,964,289

 
1,699,161

Total (MBoe)
 
707,424

 
675,206

 
601,901

Proved Undeveloped Reserves
 
 
 
 
 
 
Crude oil (MBbl)
 
423,782

 
409,271

 
322,242

Natural Gas (MMcf)
 
2,928,354

 
2,627,325

 
2,441,120

Total (MBoe)
 
911,841

 
847,159

 
729,094

Total Proved Reserves
 
 
 
 
 
 
Crude oil (MBbl)
 
760,187

 
757,096

 
640,949

Natural Gas (MMcf)
 
5,154,471

 
4,591,614

 
4,140,281

Total (MBoe)
 
1,619,265

 
1,522,365

 
1,330,995
Standardized Measure of Discounted Future Net Cash Flows
The following table sets forth the standardized measure of discounted future net cash flows attributable to proved crude oil and natural gas reserves as of December 31, 2019, 2018 and 2017. Discounted future net cash flows attributable to noncontrolling interests are not material relative to the Company's consolidated amounts and are not separately presented below.
 
 
December 31,
In thousands
 
2019
 
2018
 
2017
Future cash inflows
 
$
49,893,470

 
$
61,510,432

 
$
42,574,897

Future production costs
 
(15,309,672
)
 
(16,139,001
)
 
(11,159,362
)
Future development and abandonment costs
 
(10,033,887
)
 
(9,706,114
)
 
(6,487,097
)
Future income taxes (1)
 
(3,351,657
)
 
(6,012,439
)
 
(3,488,755
)
Future net cash flows
 
21,198,254

 
29,652,878

 
21,439,683

10% annual discount for estimated timing of cash flows
 
(10,736,613
)
 
(13,968,061
)
 
(10,969,506
)
Standardized measure of discounted future net cash flows
 
$
10,461,641

 
$
15,684,817

 
$
10,470,177
Changes in Standardized Measure of Discounted Future Net Cash Flows
The changes in the aggregate standardized measure of discounted future net cash flows attributable to proved crude oil and natural gas reserves are presented below for each of the past three years.
 
 
December 31,
 In thousands
 
2019
 
2018
 
2017
Standardized measure of discounted future net cash flows at January 1
 
$
15,684,817

 
$
10,470,177

 
$
5,510,223

Extensions, discoveries and improved recoveries, less related costs
 
1,649,322

 
5,162,635

 
1,462,629

Revisions of previous quantity estimates
 
(1,564,503
)
 
(3,522,428
)
 
(1,004,355
)
Changes in estimated future development and abandonment costs
 
1,401,513

 
1,063,089

 
743,657

Purchases (sales) of minerals in place, net
 
49,330

 
(9,192
)
 
(41,077
)
Net change in prices and production costs
 
(6,591,347
)
 
4,224,473

 
3,808,116

Accretion of discount
 
1,865,034

 
1,183,347

 
665,507

Sales of crude oil and natural gas produced, net of production costs
 
(3,486,103
)
 
(3,743,572
)
 
(2,450,474
)
Development costs incurred during the period
 
1,557,121

 
1,134,153

 
1,045,875

Change in timing of estimated future production and other
 
(1,690,779
)
 
1,324,365

 
948,519

Change in income taxes
 
1,587,236

 
(1,602,230
)
 
(218,443
)
Net change
 
(5,223,176
)
 
5,214,640

 
4,959,954

Standardized measure of discounted future net cash flows at December 31
 
$
10,461,641

 
$
15,684,817

 
$
10,470,177