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Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (Tables) | 9 Months Ended
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Sep. 30, 2019
Extractive Industries [Abstract] |
Capitalized Costs and Accumulated Depreciation, Depletion and Amortization |
|  | 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 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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