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Supplemental Oil and Gas Disclosures (Tables)
 12 Months Ended
Dec. 31, 2013
Supplemental Oil and Gas Disclosures [Abstract]  
Capitalized Costs Related to Oil and Natural Gas Producing Activities
Capitalized Costs
The following table sets forth the capitalized costs related to the Company’s oil and natural gas producing activities at December 31, 2013 and 2012:
 
 
December 31,
 
2013(1)
 
2012
 
(In thousands)
Proved oil and gas properties(2)
$
3,713,525

 
$
2,271,711

Less: Accumulated depreciation, depletion, amortization and impairment
(612,380
)
 
(383,564
)
Proved oil and gas properties, net
3,101,145

 
1,888,147

Unproved oil and gas properties
815,433

 
76,417

Total oil and gas properties, net
$
3,916,578

 
$
1,964,564



(1)
At December 31, 2013, oil and gas properties exclude capitalized costs related to certain assets in and around the Company’s Sanish project area, which were held for sale.
(2)
Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $32.6 million and $20.7 million at December 31, 2013 and 2012, respectively.
Costs Incurred in Oil and Natural Gas Property Acquisition, Exploration and Development Activities
The following table sets forth costs incurred related to the Company’s oil and natural gas activities for the years ended December 31, 2013, 2012 and 2011:
 
 
Year Ended December 31,
 
2013
 
2012
 
2011
 
(In thousands)
Acquisition costs:
 
 
 
 
 
Proved oil and gas properties
$
752,454

 
$
3,159

 
$
3,356

Unproved oil and gas properties
837,419

 
34,098

 
15,197

Exploration costs
2,260

 
3,250

 
1,685

Development costs
890,267

 
1,074,441

 
618,737

Asset retirement costs
11,856

 
9,359

 
5,055

Total costs incurred
$
2,494,256

 
$
1,124,307

 
$
644,030
Results of Operations for Oil and Natural Gas Producing Activities
Results of operations for oil and natural gas producing activities, which excludes straight-line depreciation, general and administrative expenses and interest expense, are presented below.
 
 
Year Ended December 31,
 
2013
 
2012
 
2011
 
(In thousands)
Revenues
$
1,084,412

 
$
670,491

 
$
330,422

Production costs
221,095

 
127,146

 
67,937

Depreciation, depletion and amortization
298,999

 
202,398

 
74,101

Exploration costs
2,260

 
3,250

 
1,685

Impairment of oil and gas properties
1,168

 
3,581

 
3,610

Loss on sale of properties
—

 
—

 
207

Income tax expense
196,312

 
116,941

 
64,009

Results of operations for oil and natural gas producing activities
$
364,578

 
$
217,175

 
$
118,873