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Real Estate Investments, Net - Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas (Details)
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Entity-wide revenue percentage 22.20% 17.60%
Texas    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Entity-wide revenue percentage   11.60%
United States and Puerto Rico    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Entity-wide revenue percentage 49.10% 50.00%