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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Accounting Policies [Abstract]      
Marketable securities, shares 10,809,215    
Investment in marketable securities, unrealized gain (loss) $ 20,200 $ 0  
Minimum Percentage of Adjusted Taxable Income to be Distributed to Shareholders as a Real Estate Investment Trust 90.00%    
Deferred revenues reclassified     $ 7,500
Minimum [Member] | Land, Buildings and Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life (in years) 10 years    
Minimum [Member] | Furniture Fixtures And Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life (in years) 1 year    
Maximum [Member] | Land, Buildings and Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life (in years) 40 years    
Maximum [Member] | Furniture Fixtures And Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful life (in years) 10 years