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Capitalized Costs and Accumulated Depreciation, Depletion and Amortization | 3 Months Ended
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Mar. 31, 2017
Extractive Industries [Abstract] |
Capitalized Costs and Accumulated Depreciation, Depletion and Amortization | (18) Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (a)
|  | March 31, 2017 |  |  | December 31, 2016 |
|  | (in thousands) |
Natural gas and oil properties: |  |  |  |  |  |  |  |
Properties subject to depletion |  | $ | 9,610,244 |  |  | $ | 9,462,350 |
Unproved properties |  |  | 2,941,103 |  |  |  | 2,923,803 |
Total |  |  | 12,551,347 |  |  |  | 12,386,153 |
Accumulated depreciation, depletion and amortization |  |  | (3,191,483 | ) |  |  | (3,129,816 | )
Net capitalized costs |  | $ | 9,359,864 |  |  | $ | 9,256,337 |
(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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61555-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61526-109447 + Details
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