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Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (Tables)
 6 Months Ended
Jun. 30, 2019
Extractive Industries [Abstract]  
Capitalized Costs and Accumulated Depreciation, Depletion and Amortization

 

 

June 30,
2019

 

 

December 31,
2018

 

 

 

(in thousands)

 

Natural gas and oil properties:

 

 

 

 

 

 

 

 

Properties subject to depletion

 

$

10,962,361

 

 

$

10,974,929

 

Unproved properties

 

 

2,069,962

 

 

 

2,110,277

 

Total

 

 

13,032,323

 

 

 

13,085,206

 

Accumulated depreciation, depletion and amortization

 

 

(3,911,646

)

 

 

(4,062,021

)

Net capitalized costs

 

$

9,120,677

 

 

$

9,023,185

 

(a)

Includes capitalized asset retirement costs and the associated accumulated amortization.