XML 36 R25.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Capitalized Costs and Accumulated Depreciation, Depletion and Amortization | 6 Months Ended
--- | ---
Jun. 30, 2018
Extractive Industries [Abstract] |
Capitalized Costs and Accumulated Depreciation, Depletion and Amortization | (19) Capitalized Costs and Accumulated Depreciation, Depletion and Amortization (a)
|  | June 30, 2018 |  |  | December 31, 2017 |
|  | (in thousands) |
Natural gas and oil properties: |  |  |  |  |  |  |  |
Properties subject to depletion |  | $ | 11,067,325 |  |  | $ | 10,572,453 |
Unproved properties |  |  | 2,599,162 |  |  |  | 2,644,000 |
Total |  |  | 13,666,487 |  |  |  | 13,216,453 |
Accumulated depreciation, depletion and amortization |  |  | (3,961,365 | ) |  |  | (3,649,716 | )
Net capitalized costs |  | $ | 9,705,122 |  |  | $ | 9,566,737 |
(a) | Includes capitalized asset retirement costs and the associated accumulated amortization.

X
- References No definition available. + Details
Name: | us-gaap_ExtractiveIndustriesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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 -URI http://asc.fasb.org/topic&trid=2145477 + Details
Name: | us-gaap_OilAndGasExplorationAndProductionIndustriesDisclosuresTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration