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Capitalized Costs and Accumulated Depreciation, Depletion and Amortization | 6 Months Ended
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Jun. 30, 2017
Extractive Industries [Abstract] |
Capitalized Costs and Accumulated Depreciation, Depletion and Amortization | (18) Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (a)
|  | June 30, 2017 |  |  | December 31, 2016 |
|  | (in thousands) |
Natural gas and oil properties: |  |  |  |  |  |  |  |
Properties subject to depletion |  | $ | 9,905,566 |  |  | $ | 9,462,350 |
Unproved properties |  |  | 2,938,339 |  |  |  | 2,923,803 |
Total |  |  | 12,843,905 |  |  |  | 12,386,153 |
Accumulated depreciation, depletion and amortization |  |  | (3,338,463 | ) |  |  | (3,129,816 | )
Net capitalized costs |  | $ | 9,505,442 |  |  | $ | 9,256,337 |
| (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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -URI http://asc.fasb.org/topic&trid=2145477 + Details
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