XML 18 R25.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Asset Retirement Obligation (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2014
Asset Retirement Obligation |
Asset Retirement Obligation |
(In thousands) |  | Three Months Ended March 31, 2014 |
Balance at beginning of period |  | $ | 75,853 |
Liabilities incurred |  | 1,647 |
Liabilities divested |  | (899 | )
Accretion expense |  | 1,003 |
Balance at end of period |  | $ | 77,604 |

X
- Details
Name: | us-gaap_AssetRetirementObligationDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
Name: | us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration