XML 72 R23.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Capitalized Costs and Accumulated Depreciation, Depletion and Amortization | 3 Months Ended
--- | ---
Mar. 31, 2014
Capitalized Costs and Accumulated Depreciation, Depletion and Amortization | (16) Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (a)
|  | March 31, 2014 |  |  | December 31, 2013 |
|  | (in thousands) |
Natural gas and oil properties: |  |  |  |  |  |  |  |
Properties subject to depletion |  | $ | 8,467,064 |  |  | $ | 8,225,859 |
Unproved properties |  |  | 842,679 |  |  |  | 807,022 |
Total |  |  | 9,309,743 |  |  |  | 9,032,881 |
Accumulated depreciation, depletion and amortization |  |  | (2,397,089 | ) |  |  | (2,274,444 | )
Net capitalized costs |  | $ | 6,912,654 |  |  | $ | 6,758,437 |
(a) | Includes capitalized asset retirement costs and the associated accumulated amortization.

X
- 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
Name: | us-gaap_OilAndGasExplorationAndProductionIndustriesDisclosuresTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration