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Consolidated Balance Sheets (Parentheticals) | Dec. 31, 2014 | Dec. 31, 2013
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Equity: |  |
Limited partners: Depositary units issued | 123,103,414 us-gaap_LimitedPartnersCapitalAccountUnitsIssued | 115,900,309 us-gaap_LimitedPartnersCapitalAccountUnitsIssued
Limited partners: Depositary units outstanding | 123,103,414 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding | 115,900,309 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding

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