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Real Estate Investments - Acquisitions (Details) - MINNESOTA - Real Estate Acquisition
$ in Millions
Mar. 06, 2017
USD ($)
ft²
Business Acquisition [Line Items]  
Date Acquired Mar. 06, 2017
Purchase price $ 13.5
Cash consideration 13.5
Real Estate 13.3
Other $ 0.2
Square footage | ft² 34,608