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Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (Tables)
 6 Months Ended
Jun. 30, 2017
Extractive Industries [Abstract]  
Capitalized Costs and Accumulated Depreciation, Depletion and Amortization

 

 

June 30,
2017

 

 

December 31,
2016

 

 

 

(in thousands)

 

Natural gas and oil properties:

 

 

 

 

 

 

 

 

Properties subject to depletion

 

$

9,905,566

 

 

$

9,462,350

 

Unproved properties

 

 

2,938,339

 

 

 

2,923,803

 

Total

 

 

12,843,905

 

 

 

12,386,153

 

Accumulated depreciation, depletion and amortization

 

 

(3,338,463

)

 

 

(3,129,816

)

Net capitalized costs

 

$

9,505,442

 

 

$

9,256,337

 

 

(a)

Includes capitalized asset retirement costs and the associated accumulated amortization.