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Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (Tables) | 6 Months Ended
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Jun. 30, 2021
Extractive Industries [Abstract] |
Capitalized Costs and Accumulated Depreciation, Depletion and Amortization |
|  | June 30, 2021 |  |  | December 31, 2020 |
|  | (in thousands) |
Natural gas properties: |  |  |  |  |  |
Properties subject to depletion |  | $ | 9,109,425 |  |  | $ | 8,891,348 |
Unproved properties |  |  | 863,687 |  |  |  | 859,766 |
Total |  |  | 9,973,112 |  |  |  | 9,751,114 |
Accumulated depletion and depreciation |  |  | (4,239,713 | ) |  |  | (4,064,305 | )
Net capitalized costs |  | $ | 5,733,399 |  |  | $ | 5,686,809 |
(a) Includes capitalized asset retirement costs and the associated accumulated amortization.

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- Definition Tabular disclosure of aggregate capitalized costs relating to an enterprise's oil and gas producing activities and the aggregate related accumulated depreciation, depletion, amortization, and valuation allowances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61926-109447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61901-109447 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=34713648&loc=d3e63019-109448 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61929-109447 + Details
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