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Summary of Significant Accounting Policies - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
facility
segment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Accounting Policies [Abstract]      
Accumulated amortization of deferred financing costs $ 5,100 $ 3,200  
Straight-line rental income 2,333 344 $ 150
Deferred straight-line rent receivable 2,800 500  
Stock-based compensation expense $ 3,848 2,416 1,546
Number of reportable segments | segment 1    
Tenant reimbursements $ 11,924 10,254 $ 7,846
Accounting Policies [Line Items]      
Number of living facilities | facility 197    
Mortgage loan $ 2,600    
Lease Agreements      
Accounting Policies [Line Items]      
Remaining contractual payments as lessee $ 200    
Independent Living Facilities Owned and Operated by Company      
Accounting Policies [Line Items]      
Number of living facilities | facility 3    
Unpaid Base Rents      
Accounting Policies [Line Items]      
Reserve on receivables $ 1,300 800  
Other Tenant Receivables      
Accounting Policies [Line Items]      
Reserve on receivables $ 11,600 9,600  
Priority Life Care | Bridge Loan      
Accounting Policies [Line Items]      
Mortgage loan receivable interest rate (percent) 8.00%    
Priority Life Care | Bridge Loan | Maximum      
Accounting Policies [Line Items]      
Funding commitment $ 1,400    
Eduro Healthcare LLC Loan | Term Loan      
Accounting Policies [Line Items]      
Mortgage loan receivable interest rate (percent) 8.00%    
Mortgage loan $ 1,200    
Pristine Senior Living LLC      
Accounting Policies [Line Items]      
Reserve on receivables $ 10,400 $ 10,400