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Supplemental Disclosures of Cash Flow Information (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
item
Supplemental Disclosures of Cash Flow Information    
Loans receivable   $ 48,900,000o_AccruedLoansReceivableReclassifiedToRealEstate
Number of acquired properties   5o_NumberOfRealEstatePropertiesAcquiredWithAssumedMortgages
Cash paid for interest 85,900,000us-gaap_InterestPaid 79,900,000us-gaap_InterestPaid
Interest capitalized to properties under development 94,000us-gaap_InterestCostsCapitalized 95,000us-gaap_InterestCostsCapitalized
Cash paid for income taxes 1,800,000us-gaap_IncomeTaxesPaid 942,000us-gaap_IncomeTaxesPaid
Non-cash investing and financing activities    
Loans Assumed   45,900,000us-gaap_LoansAssumed1
Net discounts recorded on mortgages assumed   2,800,000o_DiscountsOnLoansAssumed
Interest rate swap agreement acquired   901,000o_RealEstatePropertiesAcquiredInterestRateSwap
Increase in buildings and improvements and accounts payable   $ 7,100,000o_IncreaseInBuildingsAndImprovementsAndAccountsPayable