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Capitalized Costs and Accumulated Depreciation, Depletion and Amortization | 9 Months Ended
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Sep. 30, 2019
Extractive Industries [Abstract] |
Capitalized Costs and Accumulated Depreciation, Depletion and Amortization | (9) Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (a)
|  | September 30, 2019 |  |  | December 31, 2018 |
|  | (in thousands) |
Natural gas and oil properties: |  |  |  |  |  |  |  |
Properties subject to depletion |  | $ | 10,277,879 |  |  | $ | 10,974,929 |
Unproved properties |  |  | 2,061,903 |  |  |  | 2,110,277 |
Total |  |  | 12,339,782 |  |  |  | 13,085,206 |
Accumulated depreciation, depletion and amortization |  |  | (4,044,212 | ) |  |  | (4,062,021 | )
Net capitalized costs |  | $ | 8,295,570 |  |  | $ | 9,023,185 |
(a) | Includes capitalized asset retirement costs and the associated accumulated amortization.

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- Definition The entire disclosure for oil and gas producing industries. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -URI http://asc.fasb.org/topic&trid=2145477 + Details
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