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Capitalized Costs and Accumulated Depreciation, Depletion and Amortization | 9 Months Ended
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Sep. 30, 2018
Extractive Industries [Abstract] |
Capitalized Costs and Accumulated Depreciation, Depletion and Amortization | (8) Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (a)
|  | September 30, 2018 |  |  | December 31, 2017 |
|  | (in thousands) |
Natural gas and oil properties: |  |  |  |  |  |  |  |
Properties subject to depletion |  | $ | 11,041,412 |  |  | $ | 10,572,453 |
Unproved properties |  |  | 2,601,784 |  |  |  | 2,644,000 |
Total |  |  | 13,643,196 |  |  |  | 13,216,453 |
Accumulated depreciation, depletion and amortization |  |  | (3,929,060 | ) |  |  | (3,649,716 | )
Net capitalized costs |  | $ | 9,714,136 |  |  | $ | 9,566,737 |
(a) | Includes capitalized asset retirement costs and the associated accumulated amortization.

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- References No definition available. + Details
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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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