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Other Real Estate Investments - Narrative (Details)
$ in Thousands
1 Months Ended 12 Months Ended
May 31, 2017
USD ($)
Sep. 30, 2016
USD ($)
bed
Jul. 31, 2016
USD ($)
Dec. 31, 2014
USD ($)
a
unit
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Oct. 31, 2017
Real Estate Properties [Line Items]                
Preferred equity investment         $ 5,500      
Proceeds from sale of real estate investment         7,500 $ 0 $ 0  
Receipt of preferred return         0 0 0  
Gain on disposition of other real estate investment         3,538 0 0  
Interest income distribution from other real estate investment         1,500 0 0  
Mortgage Loan Receivable                
Real Estate Properties [Line Items]                
Mortgage loan         12,500      
Providence Group | Mortgage Loan Receivable                
Real Estate Properties [Line Items]                
Interest income         200      
Mortgage loan         12,500      
Mortgage loan receivable interest rate (percent)               9.00%
Preferred Equity Investment                
Real Estate Properties [Line Items]                
Interest income         1,700 $ 700 $ 900  
Signature Senior Living                
Real Estate Properties [Line Items]                
Preferred equity investment       $ 7,500        
Return from preferred equity investment (percent)       12.00%        
Number of units planned for construction | unit       134        
Area under construction | a       5        
Initial lease yield (percent)       8.00%        
Proceeds from sale of real estate investment $ 7,500              
Receipt of preferred return $ 2,500              
Gain on disposition of other real estate investment         3,500      
Interest income         1,000      
Interest income distribution from other real estate investment         $ 500      
Cascadia Development, LLC                
Real Estate Properties [Line Items]                
Preferred equity investment   $ 2,300 $ 2,200          
Initial lease yield (percent)   9.00% 9.00%          
Preferred equity instrument minimum yield   12.00% 12.00%          
Number of beds planned for construction | bed   99            
Cascadia Development, LLC | Prime Rate                
Real Estate Properties [Line Items]                
Basis spread on preferred equity investment yield   9.50% 9.50%