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Real Estate Investments (Details)
$ in Thousands
Sep. 30, 2016
USD ($)
ft²
Dec. 31, 2015
USD ($)
ft²
Real Estate Properties [Line Items]    
Number of Properties 341 278
Gross Leasable Area | ft² 6,685 5,207
Land $ 295,311 $ 225,274
Buildings 662,612 526,912
Property under Development 5,795 3,663
Gross Real Estate Investments 963,718 755,849
Less Accumulated Depreciation (65,884) (56,401)
Net Real Estate Investments $ 897,834 $ 699,448