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Summary of Significant Accounting Policies - Real Estate Properties and Mortgage Note Receivable (Details)
$ in Millions
9 Months Ended
Sep. 30, 2015
USD ($)
Mortgage Receivable [Member]  
Real Estate Properties [Line Items]  
Mortgage note receivable $ 11.0
Stated fixed interest rate percentage 9.50%
Building and improvements [Member] | Minimum [Member]  
Real Estate Properties [Line Items]  
Estimated useful life (in years) 20 years
Building and improvements [Member] | Maximum [Member]  
Real Estate Properties [Line Items]  
Estimated useful life (in years) 30 years
Lease intangibles [Member] | Minimum [Member]  
Real Estate Properties [Line Items]  
Estimated useful life (in years) 14 months
Lease intangibles [Member] | Maximum [Member]  
Real Estate Properties [Line Items]  
Estimated useful life (in years) 7 years 9 months 18 days