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Oil and Gas Producing Activities
 12 Months Ended
Dec. 31, 2014
Oil And Gas Exploration And Production Industries Disclosures [Abstract]  
Oil and Gas Producing Activities

(3)  Oil and Gas Producing Activities

Set forth below is certain information regarding the aggregate capitalized costs of oil and gas properties and costs incurred by the Company for its oil and gas property acquisition, development and exploration activities:

Capitalized Costs

 

 

 

As of December 31,

 

 

 

2013

 

 

2014

 

 

 

(In thousands)

 

 

Unproved properties

 

$

134,350

 

 

$

201,459

 

Proved properties:

 

 

 

 

 

 

 

 

Leasehold costs

 

 

971,239

 

 

 

1,006,839

 

Wells and related equipment and facilities

 

 

2,810,074

 

 

 

3,275,249

 

Accumulated depreciation depletion and amortization

 

 

(1,861,894

)

 

 

(2,298,450

)

 

 

$

2,053,769

 

 

$

2,185,097

 

Costs Incurred

 

 

 

For the Years Ended December 31,

 

 

 

2012

 

 

2013

 

 

2014

 

 

 

(In thousands)

 

Property Acquisitions:

 

 

 

 

 

 

 

 

 

 

 

 

Unproved property acquisitions

 

$

13,742

 

 

$

130,113

 

 

$

91,960

 

Proved property acquisitions

 

 

—

 

 

 

6,471

 

 

 

2,400

 

Development costs

 

 

331,254

 

 

 

341,970

 

 

 

440,848

 

Exploration costs

 

 

5,522

 

 

 

439

 

 

 

52,080

 

 

 

$

350,518

 

 

$

478,993

 

 

$

587,288