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

(18) Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (a)

 

 

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.