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Capitalized Costs and Accumulated Depreciation, Depletion and Amortization | 6 Months Ended
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Jun. 30, 2014
Capitalized Costs and Accumulated Depreciation, Depletion and Amortization | (16) Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (a)
|  | June 30, 2014 |  |  | December 31, 2013 |
|  | (in thousands) |
Natural gas and oil properties: |  |  |  |  |  |  |  |
Properties subject to depletion |  | $ | 8,843,288 |  |  | $ | 8,225,859 |
Unproved properties |  |  | 888,722 |  |  |  | 807,022 |
Total |  |  | 9,732,010 |  |  |  | 9,032,881 |
Accumulated depreciation, depletion and amortization |  |  | (2,336,666 | ) |  |  | (2,274,444 | )
Net capitalized costs |  | $ | 7,395,344 |  |  | $ | 6,758,437 |
(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 -URI http://asc.fasb.org/section&trid=2145543 + Details
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