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Supplemental Oil and Gas Reserve Information (Tables)
 12 Months Ended
Dec. 31, 2012
Extractive Industries [Abstract]  
Schedule of estimated proved oil and gas reserves
The following table sets forth estimated proved reserves together with the changes therein (oil and NGL in MBbls, gas in MMcf, gas converted to MBOE by dividing MMcf by six) for the years ended December 31, 2012, 2011 and 2010.
 
 
Oil (a)
 
Gas
 
MBOE
Proved reserves:
 

 
 

 
 

December 31, 2009
20,953

 
76,103

 
33,637

Revisions
1,511

 
4,628

 
2,282

Extensions and discoveries
18,969

 
25,343

 
23,193

Purchases of minerals-in-place
317

 
190

 
349

Sales of minerals-in-place
(268
)
 
(16,017
)
 
(2,937
)
Production
(3,667
)
 
(10,750
)
 
(5,459
)
December 31, 2010
37,815

 
79,497

 
51,065

Revisions
(1,802
)
 
(1,227
)
 
(2,007
)
Extensions and discoveries
17,570

 
19,864

 
20,881

Sales of minerals-in-place
(45
)
 
(664
)
 
(156
)
Production
(4,002
)
 
(8,594
)
 
(5,434
)
December 31, 2011
49,536

 
88,876

 
64,349

Revisions
(5,498
)
 
(6,699
)
 
(6,615
)
Extensions and discoveries
16,676

 
22,604

 
20,443

Purchases of minerals-in-place
2,474

 
6,182

 
3,504

Sales of minerals-in-place
(633
)
 
(555
)
 
(725
)
Production
(4,254
)
 
(8,072
)
 
(5,599
)
December 31, 2012
58,301

 
102,336

 
75,357

Proved developed reserves:
 

 
 

 
 

December 31, 2010
24,570

 
59,409

 
34,472

December 31, 2011
28,962

 
61,811

 
39,264

December 31, 2012
32,685

 
64,013

 
43,354

    
(a)
Includes natural gas liquids.
Standardized measure of discounted future net cash flows relating to estimated proved reserves
The standardized measure of discounted future net cash flows relating to estimated proved reserves as of December 31, 2012, 2011 and 2010 was as follows:
 
 
2012
 
2011
 
2010
 
(In thousands)
Future cash inflows
$
5,085,122

 
$
4,701,004

 
$
3,058,637

Future costs:
 
 
 
 
 
Production
(1,819,356
)
 
(1,558,067
)
 
(1,127,744
)
Development
(651,292
)
 
(510,709
)
 
(308,420
)
Income taxes
(673,686
)
 
(757,253
)
 
(455,980
)
Future net cash flows
1,940,788

 
1,874,975

 
1,166,493

10% discount factor
(1,000,957
)
 
(936,462
)
 
(482,055
)
Standardized measure of discounted net cash flows
$
939,831

 
$
938,513

 
$
684,438
Schedule of changes in the standardized measure of discounted future net cash flows relating to estimated proved reserves
Changes in the standardized measure of discounted future net cash flows relating to estimated proved reserves for the years ended December 31, 2012, 2011 and 2010 were as follows:
 
 
2012
 
2011
 
2010
 
(In thousands)
Standardized measure, beginning of period
$
938,512

 
$
684,438

 
$
364,273

Net changes in sales prices, net of production costs
(196,930
)
 
206,357

 
192,193

Revisions of quantity estimates
(144,899
)
 
(53,089
)
 
56,190

Accretion of discount
137,369

 
99,028

 
45,963

Changes in future development costs, including development costs incurred that reduced future development costs
148,733

 
84,638

 
39,689

Changes in timing and other
(58,322
)
 
(45,055
)
 
20,839

Net change in income taxes
76,593

 
(130,562
)
 
(210,090
)
Future abandonment cost, net of salvage
(9,230
)
 
925

 
(1,107
)
Extensions and discoveries
289,999

 
399,068

 
441,719

Sales, net of production costs
(277,248
)
 
(305,769
)
 
(244,792
)
Purchases of minerals-in-place
80,744

 
—

 
9,290

Sales of minerals-in-place
(45,490
)
 
(1,466
)
 
(29,729
)
Standardized measure, end of period
$
939,831

 
$
938,512

 
$
684,438
Schedule of average prices used for each commodity
The average prices used for each commodity for the years ended December 31, 2012, 2011 and 2010 were as follows:
 
 
Average Price
 
Oil (a)
 
Gas
As of December 31:
 

 
 

2012 (b)
$
83.09

 
$
3.70

2011 (b)
$
87.61

 
$
5.31

2010 (b)
$
72.36

 
$
5.44

    
(a)
Includes natural gas liquids.
(b)
Average prices for December 31, 2012, 2011 and 2010 were based on the 12-month unweighted arithmetic average of the first-day-of-the-month price for the period from January through December during each respective calendar year.