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Capitalized Costs and Accumulated Depreciation, Depletion and Amortization | 6 Months Ended
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Jun. 30, 2015
Extractive Industries [Abstract] |
Capitalized Costs and Accumulated Depreciation, Depletion and Amortization | (17) Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (a)
|  | June 30, 2015 |  |  | December 31, 2014 |
|  | (in thousands) |
Natural gas and oil properties: |  |  |  |  |  |  |  |
Properties subject to depletion |  | $ | 10,019,744 |  |  | $ | 9,624,725 |
Unproved properties |  |  | 946,416 |  |  |  | 943,246 |
Total |  |  | 10,966,160 |  |  |  | 10,567,971 |
Accumulated depreciation, depletion and amortization |  |  | (2,725,802 | ) |  |  | (2,590,398 | )
Net capitalized costs |  | $ | 8,240,358 |  |  | $ | 7,977,573 |
(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=8451039&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=8451039&loc=d3e61526-109447 + Details
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