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Supplemental Oil and Gas Reserve Information (Tables)
 12 Months Ended
Dec. 31, 2013
Oil and Gas Exploration and Production Industries Disclosures [Abstract]  
Net Proved, Proved Developed and Proved Undeveloped Reserves
The following table sets forth the Company’s estimated net proved, proved developed and proved undeveloped reserves at December 31, 2013, 2012 and 2011:
 
 
Oil
(MBbl)
 
Gas
(MMcf)
 
MBoe
2011
 
 
 
 
 
Proved reserves
 
 
 
 
 
Beginning balance
36,550

 
19,379

 
39,780

Revisions of previous estimates
(262
)
 
(159
)
 
(288
)
Extensions, discoveries and other additions
36,464

 
40,220

 
43,168

Sales of reserves in place
(56
)
 
(518
)
 
(142
)
Purchases of reserves in place
100

 
65

 
111

Production
(3,732
)
 
(1,087
)
 
(3,914
)
Net proved reserves at December 31, 2011
69,064

 
57,900

 
78,715

Proved developed reserves, December 31, 2011
31,749

 
24,535

 
35,839

Proved undeveloped reserves, December 31, 2011
37,315

 
33,365

 
42,876

2012
 
 
 
 
 
Proved reserves
 
 
 
 
 
Beginning balance
69,064

 
57,900

 
78,715

Revisions of previous estimates
(567
)
 
(8,495
)
 
(1,983
)
Extensions, discoveries and other additions
66,245

 
45,759

 
73,871

Sales of reserves in place
—

 
—

 
—

Purchases of reserves in place
881

 
512

 
966

Production
(7,533
)
 
(4,146
)
 
(8,224
)
Net proved reserves at December 31, 2012
128,090

 
91,530

 
143,345

Proved developed reserves, December 31, 2012
62,602

 
44,695

 
70,051

Proved undeveloped reserves, December 31, 2012
65,488

 
46,835

 
73,294

2013
 
 
 
 
 
Proved reserves
 
 
 
 
 
Beginning balance
128,090

 
91,530

 
143,345

Revisions of previous estimates
3,390

 
10,411

 
5,125

Extensions, discoveries and other additions
40,784

 
31,856

 
46,094

Sales of reserves in place
—

 
—

 
—

Purchases of reserves in place
37,459

 
49,631

 
45,731

Production
(11,133
)
 
(7,450
)
 
(12,375
)
Net proved reserves at December 31, 2013
198,590

 
175,979

 
227,920

Proved developed reserves, December 31, 2013
106,774

 
92,170

 
122,136

Proved undeveloped reserves, December 31, 2013
91,816

 
83,809

 
105,784
Standardized Measure of Discounted Future Cash Flows
The following table sets forth the Standardized Measure of discounted future net cash flows from projected production of the Company’s estimated net proved reserves at December 31, 2013, 2012 and 2011.
 
 
At December 31,
 
2013
 
2012
 
2011
 
(In thousands)
Future cash inflows
$
19,063,500

 
$
11,321,992

 
$
6,508,604

Future production costs
(5,473,767
)
 
(2,809,960
)
 
(1,690,264
)
Future development costs
(1,904,095
)
 
(1,434,648
)
 
(783,486
)
Future income tax expense
(3,628,977
)
 
(2,123,973
)
 
(1,225,395
)
Future net cash flows
8,056,661

 
4,953,411

 
2,809,459

10% annual discount for estimated timing of cash flows
(4,329,102
)
 
(2,693,514
)
 
(1,489,988
)
Standardized measure of discounted future net cash flows
$
3,727,559

 
$
2,259,897

 
$
1,319,471
Changes in Standardized Measure of Discounted Future Net Cash Flows Applicable to Proved Oil and Natural Gas Reserves
The following table sets forth the changes in the Standardized Measure of discounted future net cash flows applicable to estimated net proved reserves for the periods presented.
 
 
2013
 
2012
 
2011
 
(In thousands)
January 1,
$
2,259,897

 
$
1,319,471

 
$
485,735

Net changes in prices and production costs
254,979

 
(7,814
)
 
299,108

Net changes in future development costs
57,566

 
28,124

 
(38,244
)
Sales of oil and natural gas, net
(857,540
)
 
(542,515
)
 
(262,485
)
Extensions
1,111,202

 
1,358,479

 
989,697

Discoveries
—

 
—

 
—

Purchases of reserves in place
858,382

 
15,890

 
2,679

Sales of reserves in place
—

 
—

 
(2,499
)
Revisions of previous quantity estimates
99,954

 
(47,957
)
 
(5,058
)
Previously estimated development costs incurred
373,912

 
480,925

 
146,847

Accretion of discount
346,068

 
190,370

 
69,782

Net change in income taxes
(774,910
)
 
(400,196
)
 
(372,146
)
Changes in timing and other
(1,951
)
 
(134,880
)
 
6,055

December 31,
$
3,727,559

 
$
2,259,897

 
$
1,319,471