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Subsequent Events - Debt Obligations (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Obligations        
Stockholders' Equity Attributable to Noncontrolling Interest   $ 7,481,000 $ 3,488,000  
Investment Commitments.   184,560,000    
Amount borrowed   116,200,000 213,000,000 $ 201,100,000
Payments on debt   138,866,000 154,767,000 163,667,000
Outstanding Balance   645,029,000 667,502,000  
Available for borrowing   581,833,000 567,167,000  
Bank Borrowings        
Debt Obligations        
Amount borrowed   116,200,000 113,000,000 123,600,000
Payments on debt   100,700,000 123,600,000 137,000,000
Outstanding Balance   112,000,000 96,500,000  
Available for borrowing   488,000,000 503,500,000  
Bank Borrowings | Subsequent Event        
Debt Obligations        
Amount borrowed $ 26,400,000      
Outstanding Balance 138,400,000      
Available for borrowing 461,600,000      
Senior Unsecured Notes        
Debt Obligations        
Amount borrowed     100,000,000 77,500,000
Payments on debt   38,166,000 31,167,000 $ 26,667,000
Outstanding Balance   533,029,000 571,002,000  
Available for borrowing   $ 93,833,000 $ 63,667,000  
Senior Unsecured Notes | Subsequent Event        
Debt Obligations        
Payments on debt 4,167,000      
Outstanding Balance 528,862,000      
Available for borrowing $ 98,000,000      
74-Unit ALF/MC | ALF and MC        
Debt Obligations        
Number of Beds or Units in Real Estate Property Sold | item   74    
Real Estate Investment Economic Interest in Joint Venture Percentage 95.00%      
74-Unit ALF/MC | ALF and MC | Subsequent Event        
Debt Obligations        
Stockholders' Equity Attributable to Noncontrolling Interest $ 919,000      
Investment Commitments. $ 15,950,000