Quarterly report pursuant to Section 13 or 15(d)

Commitments And Contingencies (Other) (Narrative) (Details)

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Commitments And Contingencies (Other) (Narrative) (Details)
9 Months Ended
Sep. 30, 2017
USD ($)
property
Sep. 30, 2016
USD ($)
Commitments And Contingencies [Line Items]    
Purchase price of property $ 67,797,000 $ 94,017,000
Notes Receivable 5.85 Interest Rate [Member]    
Commitments And Contingencies [Line Items]    
Notes receivable $ 44,695,187  
Mortgage loan, maturity date Jul. 01, 2019  
Interest rate 5.85%  
Purchase price of property $ 73,000,000  
Property Lock-Ups [Member]    
Commitments And Contingencies [Line Items]    
Expiration year 2016  
Property Lock-Ups Expired [Member]    
Commitments And Contingencies [Line Items]    
Number of properties | property 83  
Properties aggregate net book value $ 1,000,000,000