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Real Estate Investments (Details) (USD $)
Mar. 31, 2015
sqft
Dec. 31, 2014
sqft
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Number of Real Estate Properties 233us-gaap_NumberOfRealEstateProperties 209us-gaap_NumberOfRealEstateProperties
Gross Leasable Area 4,658,000us-gaap_LandSubjectToGroundLeases 4,315,000us-gaap_LandSubjectToGroundLeases
Land $ 203,982,919us-gaap_Land $ 195,091,303us-gaap_Land
Buildings 434,288,988us-gaap_InvestmentBuildingAndBuildingImprovements 393,826,467us-gaap_InvestmentBuildingAndBuildingImprovements
Property under Development 294,357us-gaap_DevelopmentInProcess 229,242us-gaap_DevelopmentInProcess
Gross Real Estate Investments 638,566,264us-gaap_RealEstateInvestmentPropertyAtCost 589,147,012us-gaap_RealEstateInvestmentPropertyAtCost
Less accumulated depreciation (61,641,135)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation (59,089,851)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
Net Real Estate Investments $ 576,925,129us-gaap_RealEstateInvestmentPropertyNet $ 530,057,161us-gaap_RealEstateInvestmentPropertyNet