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Supplemental Oil and Gas Reserve Information - Unaudited (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2015, 2014 and 2013:
 
 
Oil
(MBbl)
 
Gas
(MMcf)
 
MBoe
2013
 
 
 
 
 
Proved reserves
 
 
 
 
 
Beginning balance
128,090

 
91,530

 
143,345

Revisions of previous estimates
3,390

 
10,412

 
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

2014
 
 
 
 
 
Proved reserves
 
 
 
 
 
Beginning balance
198,590

 
175,979

 
227,920

Revisions of previous estimates
(23,069
)
 
(12,290
)
 
(25,117
)
Extensions, discoveries and other additions
80,855

 
70,449

 
92,596

Sales of reserves in place
(7,640
)
 
(4,850
)
 
(8,448
)
Purchases of reserves in place
1,546

 
1,523

 
1,799

Production
(14,883
)
 
(10,691
)
 
(16,664
)
Net proved reserves at December 31, 2014
235,399

 
220,120

 
272,086

Proved developed reserves, December 31, 2014
127,340

 
114,016

 
146,343

Proved undeveloped reserves, December 31, 2014
108,059

 
106,104

 
125,743

2015
 
 
 
 
 
Proved reserves
 
 
 
 
 
Beginning balance
235,399

 
220,120

 
272,086

Revisions of previous estimates
(75,458
)
 
(55,065
)
 
(84,635
)
Extensions, discoveries and other additions
38,962

 
46,072

 
46,640

Sales of reserves in place
—

 
—

 
—

Purchases of reserves in place
2,115

 
2,702

 
2,565

Production
(16,090
)
 
(14,001
)
 
(18,423
)
Net proved reserves at December 31, 2015
184,928

 
199,828

 
218,233

Proved developed reserves, December 31, 2015
127,445

 
120,789

 
147,577

Proved undeveloped reserves, December 31, 2015
57,483

 
79,039

 
70,656
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, 2015, 2014 and 2013:
 
 
At December 31,
 
2015
 
2014
 
2013
 
(In thousands)
Future cash inflows
$
8,582,831

 
$
21,656,832

 
$
19,063,500

Future production costs
(3,842,517
)
 
(7,094,426
)
 
(5,473,767
)
Future development costs
(909,562
)
 
(2,563,062
)
 
(1,904,095
)
Future income tax expense
(225,662
)
 
(3,188,389
)
 
(3,628,977
)
Future net cash flows
3,605,090

 
8,810,955

 
8,056,661

10% annual discount for estimated timing of cash flows
(1,690,760
)
 
(4,829,294
)
 
(4,329,102
)
Standardized measure of discounted future net cash flows
$
1,914,330

 
$
3,981,661

 
$
3,727,559
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:
 
 
2015
 
2014
 
2013
 
(In thousands)
January 1
$
3,981,661

 
$
3,727,559

 
$
2,259,897

Net changes in prices and production costs
(3,201,195
)
 
(588,212
)
 
254,979

Net changes in future development costs
150,333

 
(61,760
)
 
57,566

Sales of oil and natural gas, net
(477,755
)
 
(979,938
)
 
(857,540
)
Extensions
409,838

 
1,751,007

 
1,111,202

Discoveries
—

 
—

 
—

Purchases of reserves in place
14,378

 
38,035

 
858,382

Sales of reserves in place
—

 
(251,002
)
 
—

Revisions of previous quantity estimates
(946,729
)
 
(604,651
)
 
99,954

Previously estimated development costs incurred
216,981

 
249,926

 
373,912

Accretion of discount
548,141

 
548,690

 
346,068

Net change in income taxes
1,391,358

 
259,592

 
(774,910
)
Changes in timing and other
(172,681
)
 
(107,585
)
 
(1,951
)
December 31
$
1,914,330

 
$
3,981,661

 
$
3,727,559