| For the Quarter Ended March 31, 2012 | Download |
| XBRL Instance Document |  |
| XBRL Taxonomy Extension Schema Document |  |
| XBRL Taxonomy Extension Calculation Linkbase Document |  |
| XBRL Taxonomy Extension Label Linkbase Document |  |
| XBRL Taxonomy Extension Presentation Linkbase Document |  |
| XBRL Taxonomy Extension Definition Linkbase Document |  |
| XBRL Document (All) |  |

| SEC XBRL Viewer | |
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| For the Year Ended December 31, 2011 | XBRL Download |
| XBRL Instance Document |  |
| XBRL Taxonomy Extension Schema Document |  |
| XBRL Taxonomy Extension Calculation Linkbase Document |  |
| XBRL Taxonomy Extension Label Linkbase Document |  |
| XBRL Taxonomy Extension Presentation Linkbase Document |  |
| XBRL Taxonomy Extension Definition Linkbase Document |  |
| XBRL Documents (All) |  |
SEC XBRL Viewer
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| For the Quarter Ended September 30, 2011 | XBRL Download |
| XBRL Instance Document |  |
| XBRL Taxonomy Extension Schema Document |  |
| XBRL Taxonomy Extension Calculation Linkbase Document |  |
| XBRL Taxonomy Extension Label Linkbase Document |  |
| XBRL Taxonomy Extension Presentation Linkbase Document |  |
| XBRL Taxonomy Extension Definition Linkbase Document |  |
| XBRL Documents (All) |  |
SEC XBRL Viewer
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 |  |
| For the Quarter Ended June 30, 2011 | XBRL Download |
| XBRL Instance Document |  |
| XBRL Taxonomy Extension Schema Document |  |
| XBRL Taxonomy Extension Calculation Linkbase Document |  |
| XBRL Taxonomy Extension Label Linkbase Document |  |
| XBRL Taxonomy Extension Presentation Linkbase Document |  |
| XBRL Taxonomy Extension Definition Linkbase Document |  |
| XBRL Documents (All) |  |
SEC XBRL Viewer
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