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Other Real Estate Investments - Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
bed
Jul. 31, 2016
USD ($)
bed
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Oct. 31, 2017
USD ($)
Real Estate Properties [Line Items]              
Preferred equity investment     $ 5,700,000   $ 5,700,000    
Interest received in cash from preferred equity investment         0 $ 1,500,000  
Mortgage Loan Receivable              
Real Estate Properties [Line Items]              
Mortgage loan     12,300,000   12,300,000    
Providence Group | Mortgage Loan Receivable              
Real Estate Properties [Line Items]              
Interest income     300,000   900,000    
Mortgage loan             $ 12,500,000
Mortgage loan receivable interest rate (percent)             9.00%
Cascadia Development, LLC              
Real Estate Properties [Line Items]              
Preferred equity investment $ 2,300,000 $ 2,200,000          
Preferred equity investment minimum yield 12.00% 12.00%          
Number of beds planned for construction | bed 99 99          
Initial lease yield (percent) 9.00% 9.00%          
Cascadia Development, LLC | Prime Rate              
Real Estate Properties [Line Items]              
Basis spread of preferred equity investment yield 9.50% 9.50%          
Preferred Equity Investment              
Real Estate Properties [Line Items]              
Interest income     $ 0 $ 200,000 200,000 1,500,000  
Interest received in cash from preferred equity investment         $ 0 $ 975,000