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