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Property Acquisitions (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Supplemental pro forma for the year: |  |  |  |
Total revenue | $ 38,061 | [1] | $ 34,679 | [1]
Income before discontinued operations | $ 15,738 | [1] | $ 15,401 | [1]
[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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