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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Accounting Policies [Abstract]      
Minimum Percentage of Adjusted Taxable Income to be Distributed to Shareholders as a Real Estate Investment Trust 90.00%    
Investment in marketable securities, carrying values $ 158,300   $ 0
Investment in marketable securities, unrealized gain (loss) 600 $ 0  
Deferred revenues recognized 14,700 $ 14,000  
Deferred revenues reclassified $ 6,900   $ 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