XML 30 R28.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Asset Retirement Obligations (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2013
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Changes in Asset Retirement Obligations | The following table reflects the changes in the Company’s ARO during the three months ended March 31, 2013:
|  | (In thousands) |
Balance at December 31, 2012 |  | $ | 23,234 |
Liabilities incurred during period |  |  | 1,565 |
Liabilities settled during period |  |  | — |
Accretion expense during period (1) |  |  | 280 |
Revisions to estimates |  |  | 227 |
Balance at March 31, 2013 |  | $ | 25,306 |
(1) | Included in depreciation, depletion and amortization on the Company’s Condensed Consolidated Statement of Operations.

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