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Consolidated Balance Sheets (Parentheticals) |  |  |  |  | 0 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Nov. 30, 2012 Depositary Units [Member] | Aug. 31, 2012 Depositary Units [Member] | May 31, 2012 Depositary Units [Member] | Mar. 30, 2012 Depositary Units [Member]
Equity: |  |  |  |  |  |  |  |
Limited partners: Depositary units issued | 104,850,813 | 86,708,914 |  |  |  |  |  |
Limited partners: Depositary units outstanding | 104,850,813 | 85,571,714 |  |  |  |  |  |
Units issued as a unit distribution |  |  |  |  | 621,064 | 627,651 | 532,190 | 619,585
Treasury units at cost, units outstanding | 0 | 1,137,200 | 1,137,200 | 1,137,200 |  |  |  |

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