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Capitalized Costs and Accumulated Depreciation, Depletion and Amortization | 9 Months Ended
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Sep. 30, 2021
Extractive Industries [Abstract] |
Capitalized Costs and Accumulated Depreciation, Depletion and Amortization | (8) Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (a)
|  | September 30, 2021 |  |  | December 31, 2020 |
|  | (in thousands) |
Natural gas properties: |  |  |  |  |  |
Properties subject to depletion |  | $ | 9,203,586 |  |  | $ | 8,891,348 |
Unproved properties |  |  | 864,659 |  |  |  | 859,766 |
Total |  |  | 10,068,245 |  |  |  | 9,751,114 |
Accumulated depletion and depreciation |  |  | (4,330,289 | ) |  |  | (4,064,305 | )
Net capitalized costs |  | $ | 5,737,956 |  |  | $ | 5,686,809 |
(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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