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Subsequent Events (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Feb. 07, 2019
USD ($)
Feb. 01, 2019
a
Dec. 31, 2018
Subsequent Event [Line Items]        
Debt Instrument, Interest Rate, Effective Percentage       3.80%
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Area of Land | a     0.4  
Gain on sale of non-depreciable real estate assets $ 9.0      
Mortgages        
Subsequent Event [Line Items]        
Debt Instrument, Interest Rate, Effective Percentage       4.44%
Mortgages | Subsequent Event [Member] | Post Soho Square [Member]        
Subsequent Event [Line Items]        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate   $ 191.3    
Debt Instrument, Interest Rate, Effective Percentage   4.43%