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Summary Of Significant Accounting Policies (Derivative Instruments and Mortgage Notes Receivable) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Nov. 01, 2018
Derivatives, Fair Value [Line Items]      
Residual profit maximum 50.00%    
Aggregate tax basis for Federal tax purposes $ 30.4 $ 30.4  
Interest Rate 10.25% 10.00%  
Derivative, Fixed Interest Rate     2.62%
Interest Rate Swap | Fair Value, Measurements, Recurring      
Derivatives, Fair Value [Line Items]      
Number of interest rate swap agreements     2
Equity Method Investee | Assembly Row Hotel      
Derivatives, Fair Value [Line Items]      
Derivative, Fixed Interest Rate 5.206%