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Property Acquisitions (Tables) | 12 Months Ended
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Dec. 31, 2012
Business Combinations [Abstract] |
Business Acquisition, Pro Forma Information [Table Text Block] | The following pro forma total revenue and income before discontinued operations for the 2012 acquisitions in aggregate, assumes the acquisitions had taken place on January 1, 2012 for the 2012 pro forma information, and on January 1, 2011 for the 2011 pro forma information (in thousands):
Supplemental pro forma for the year ended December 31, 2012 (1) |  |  |  |
Total revenue |  | $ | 38,061 |
Income before discontinued operations |  | $ | 15,738 |
Supplemental pro forma for the year ended December 31, 2011 (1) |  |  |  |
Total revenue |  | $ | 34,679 |
Income before discontinued operations |  | $ | 15,401 |
| (1) | This unaudited pro forma supplemental information does not purport to be indicative of what our operating results would have been had the acquisitions occurred on January 1, 2012 or January 1, 2011 and may not be indicative of future operating results. Various acquisitions were of newly leased or constructed assets and may not have been in service for the full periods shown.

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- Definition Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 54 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 55 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph r(2, 3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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