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Oil and Gas Producing Activities (Tables)
 12 Months Ended
Dec. 31, 2016
Oil And Gas Exploration And Production Industries Disclosures [Abstract]  
Capitalized Costs Related to Oil and Gas Property Acquisition Exploration and Development Activities

Capitalized Costs

  

 

As of December 31,

 

 

 

2015

 

 

2016

 

 

 

(In thousands)

 

 

Unproved properties

 

$

84,144

 

 

$

—

 

Proved properties:

 

 

 

 

 

 

 

 

Leasehold costs

 

 

982,915

 

 

 

662,022

 

Wells and related equipment and facilities

 

 

3,349,307

 

 

 

3,135,079

 

Accumulated depreciation depletion and amortization

 

 

(3,389,786

)

 

 

(3,009,236

)

 

 

$

1,026,580

 

 

$

787,865

 

 
Costs Incurred Related to Oil and Gas Property Acquisition Exploration and Development Activities

Costs Incurred

 

 

For the Years Ended December 31,

 

 

 

2014

 

 

2015

 

 

2016

 

 

 

(In thousands)

 

Property Acquisitions:

 

 

 

 

 

 

 

 

 

 

 

 

Unproved property acquisitions

 

$

91,960

 

 

$

12,972

 

 

$

—

 

Proved property acquisitions

 

 

2,400

 

 

 

—

 

 

 

—

 

Development costs

 

 

440,848

 

 

 

221,265

 

 

 

58,587

 

Exploration costs

 

 

52,080

 

 

 

12,265

 

 

 

—

 

 

 

$

587,288

 

 

$

246,502

 

 

$

58,587