XML 30 R33.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Asset Retirement Obligations (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2012
Schedule of Changes in Asset Retirement Obligations | The following table reflects the changes in the Company’s ARO during the years ended December 31, 2012 and 2011:
|  | December 31, |
|  | 2012 |  |  | 2011 |
|  | (In thousands) |
Asset retirement obligation — beginning of period |  | $ | 13,075 |  |  | $ | 7,640 |
Liabilities incurred during period |  |  | 7,585 |  |  |  | 4,100 |
Liabilities settled during period |  |  | (71 | ) |  |  | (369 | )
Accretion expense during period |  |  | 872 |  |  |  | 590 |
Revisions to estimates |  |  | 1,773 |  |  |  | 1,114 |
Asset retirement obligation — end of period |  | $ | 23,234 |  |  | $ | 13,075 |

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