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Real Estate Investments (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
ft²
Dec. 31, 2015
USD ($)
ft²
Real Estate Properties [Line Items]    
Number of Properties 366 278
Gross Leasable Area | ft² 7,033 5,207
Land $ 309,687 $ 225,274
Buildings 703,506 526,912
Property under Development 6,764 3,663
Gross Real Estate Investments 1,019,957 755,849
Less Accumulated Depreciation (69,696) (56,401)
Net Real Estate Investments $ 950,261 $ 699,448