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Supplemental Crude Oil and Natural Gas Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2014
 
866,360

 
2,908,386

 
1,351,091

Revisions of previous estimates
 
(246,840
)
 
(302,143
)
 
(297,198
)
Extensions, discoveries and other additions
 
134,764

 
710,453

 
253,173

Production
 
(53,517
)
 
(164,454
)
 
(80,926
)
Sales of minerals in place
 
(253
)
 
(456
)
 
(329
)
Purchases of minerals in place
 
—

 
—

 
—

Proved reserves as of December 31, 2015
 
700,514

 
3,151,786

 
1,225,811

Revisions of previous estimates
 
(99,966
)
 
(63,057
)
 
(110,474
)
Extensions, discoveries and other additions
 
97,587

 
911,062

 
249,430

Production
 
(46,850
)
 
(195,240
)
 
(79,390
)
Sales of minerals in place
 
(8,057
)
 
(14,733
)
 
(10,513
)
Purchases of minerals in place
 
—

 
—

 
—

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
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, 2017, 2016 and 2015:
 
 
December 31,
 
 
2017
 
2016
 
2015
Proved Developed Reserves
 
 
 
 
 
 
Crude oil (MBbl)
 
318,707

 
290,210

 
326,798

Natural Gas (MMcf)
 
1,699,161

 
1,370,620

 
1,190,343

Total (MBoe)
 
601,901

 
518,646

 
525,188

Proved Undeveloped Reserves
 
 
 
 
 
 
Crude oil (MBbl)
 
322,242

 
353,018

 
373,716

Natural Gas (MMcf)
 
2,441,120

 
2,419,198

 
1,961,443

Total (MBoe)
 
729,094

 
756,218

 
700,623

Total Proved Reserves
 
 
 
 
 
 
Crude oil (MBbl)
 
640,949

 
643,228

 
700,514

Natural Gas (MMcf)
 
4,140,281

 
3,789,818

 
3,151,786

Total (MBoe)
 
1,330,995

 
1,274,864

 
1,225,811
Standardized Measure of Discounted Future Net Cash Flows
The following table sets forth the standardized measure of discounted future net cash flows attributable to the Company’s proved crude oil and natural gas reserves as of December 31, 2017, 2016 and 2015.
 
 
December 31,
In thousands
 
2017
 
2016
 
2015
Future cash inflows
 
$
42,574,897

 
$
31,008,587

 
$
36,551,672

Future production costs
 
(11,159,362
)
 
(9,175,410
)
 
(10,869,493
)
Future development and abandonment costs
 
(6,487,097
)
 
(6,452,647
)
 
(6,935,958
)
Future income taxes (1)
 
(3,488,755
)
 
(3,018,839
)
 
(3,717,612
)
Future net cash flows
 
21,439,683

 
12,361,691

 
15,028,609

10% annual discount for estimated timing of cash flows
 
(10,969,506
)
 
(6,851,468
)
 
(8,552,325
)
Standardized measure of discounted future net cash flows
 
$
10,470,177

 
$
5,510,223

 
$
6,476,284
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 the Company’s proved crude oil and natural gas reserves are presented below for each of the past three years.
 
 
December 31,
 In thousands
 
2017
 
2016
 
2015
Standardized measure of discounted future net cash flows at January 1
 
$
5,510,223

 
$
6,476,284

 
$
18,433,034

Extensions, discoveries and improved recoveries, less related costs
 
1,462,629

 
786,587

 
1,091,283

Revisions of previous quantity estimates
 
(1,004,355
)
 
(794,785
)
 
(2,156,028
)
Changes in estimated future development and abandonment costs
 
743,657

 
1,651,218

 
5,008,731

Sales of minerals in place, net
 
(41,077
)
 
(90,390
)
 
(7,768
)
Net change in prices and production costs
 
3,808,116

 
(2,003,163
)
 
(16,111,142
)
Accretion of discount
 
665,507

 
798,597

 
1,843,303

Sales of crude oil and natural gas produced, net of production costs
 
(2,450,474
)
 
(1,595,281
)
 
(2,002,997
)
Development costs incurred during the period
 
1,045,875

 
454,983

 
1,394,584

Change in timing of estimated future production and other
 
948,519

 
(538,665
)
 
(3,844,259
)
Change in income taxes
 
(218,443
)
 
364,838

 
2,827,543

Net change
 
4,959,954

 
(966,061
)
 
(11,956,750
)
Standardized measure of discounted future net cash flows at December 31
 
$
10,470,177

 
$
5,510,223

 
$
6,476,284