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Capital (Details)
3 Months Ended
Mar. 31, 2015
Shares and Units [Abstract]  
OP units outstanding (shares) 267,555,807us-gaap_UnitsOfPartnershipInterestAmount
OP units owned by the Company (shares) 111,747,341us-gaap_GeneralPartnersCapitalAccountUnitsOutstanding
OP units owned by the Company, percent 41.80%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
OP units not owned by the Company (shares) 155,808,466us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
OP units not owned by the Company, percent 58.20%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest