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Capitalized Costs and Accumulated Depreciation, Depletion and Amortization | 6 Months Ended
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Jun. 30, 2013
Capitalized Costs and Accumulated Depreciation, Depletion and Amortization | (16) Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (a)
| June 30, 2013 |  |  | December 31, 2012 |
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| (in thousands) |
Natural gas and oil properties: |  |  |  |  |  |  |
Properties subject to depletion | $ |  | 7,645,140 |  |  | $ |  | 7,368,308 |
Unproved properties |  | 724,501 |  |  |  | 743,467 |
Total |  | 8,369,641 |  |  |  | 8,111,775 |
Accumulated depreciation, depletion and amortization |  | (2,035,850 | ) |  |  | (2,015,591 | )
Net capitalized costs | $ |  | 6,333,791 |  |  | $ |  | 6,096,184 |
(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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59A-59Z, 59AA, 59BB, 59CC -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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