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Real Estate Investments - Acquisitions (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
item
property
Dec. 31, 2017
USD ($)
item
property
Dec. 31, 2016
USD ($)
item
property
Real estate investments        
Stockholders' Equity Attributable to Noncontrolling Interest   $ 7,481,000 $ 3,488,000  
Investment Commitment   184,560,000    
ALF and MC | 74-Unit ALF/MC        
Real estate investments        
Number of beds/units acquired | item 74      
Real Estate Investment Economic Interest in Joint Venture Percentage 95.00%      
2018 Acquisitions        
Real estate investments        
Purchase Price   40,295,000    
Transaction Costs   113,000    
Total Acquisition Costs   $ 40,408,000    
Number of properties acquired | property   3    
Number of beds/units acquired | item   177    
Real Estate Investment Economic Interest in Joint Venture Percentage   88.00%    
2018 Acquisitions | ALF        
Real estate investments        
Purchase Price   $ 39,600,000    
Transaction Costs   65,000    
Total Acquisition Costs   $ 39,665,000    
Number of properties acquired | property   3    
Number of beds/units acquired | item   177    
2018 Acquisitions | ILF | 89-unit ILF        
Real estate investments        
Purchase Price   $ 14,400,000    
Stockholders' Equity Attributable to Noncontrolling Interest   2,857,000    
Investment Commitment   $ 11,543,000    
Number of beds/units under development | item   89    
2018 Acquisitions | MC | Texas        
Real estate investments        
Number of properties acquired | property   2    
2018 Acquisitions | Land        
Real estate investments        
Purchase Price   $ 695,000    
Transaction Costs   48,000    
Total Acquisition Costs   743,000    
2018 Acquisitions | ALF and MC        
Real estate investments        
Real Estate Investment Economic Interest in Joint Venture Percentage 95.00%      
2018 Acquisitions | ALF and MC | 74-Unit ALF/MC        
Real estate investments        
Stockholders' Equity Attributable to Noncontrolling Interest $ 919,000      
Investment Commitment 15,950,000      
2018 Acquisitions | ALF and MC | 78-unit ALF/MC        
Real estate investments        
Purchase Price   18,108,000    
Stockholders' Equity Attributable to Noncontrolling Interest   $ 1,081,000    
Number of beds/units acquired | item   78    
Investment Commitment   $ 17,027,000    
Number of beds/units under development | item   78    
2017 Acquisitions        
Real estate investments        
Purchase Price     81,818,000  
Transaction Costs     587,000  
Total Acquisition Costs     $ 82,405,000  
Number of properties acquired | property     5  
Number of beds/units acquired | item     400  
2017 Acquisitions | ALF        
Real estate investments        
Purchase Price     $ 81,018,000  
Transaction Costs     569,000  
Total Acquisition Costs     $ 81,587,000  
Number of properties acquired | property     5  
Number of beds/units acquired | item     400  
2017 Acquisitions | Land        
Real estate investments        
Purchase Price     $ 800,000  
Transaction Costs     18,000  
Total Acquisition Costs     $ 818,000  
2016 Acquisitions        
Real estate investments        
Purchase Price       $ 76,441,000
Transaction Costs       576,000
Total Acquisition Costs       $ 77,017,000
Number of properties acquired | property       5
Number of beds/units acquired | item       376
2016 Acquisitions | SNF        
Real estate investments        
Purchase Price       $ 16,000,000
Transaction Costs       45,000
Total Acquisition Costs       $ 16,045,000
Number of properties acquired | property       1
Number of beds/units acquired | item       126
2016 Acquisitions | ALF        
Real estate investments        
Purchase Price       $ 53,550,000
Transaction Costs       423,000
Total Acquisition Costs       $ 53,973,000
Number of properties acquired | property       4
Number of beds/units acquired | item       250
2016 Acquisitions | MC | Kansas        
Real estate investments        
Number of properties acquired | property       2
2016 Acquisitions | Land        
Real estate investments        
Purchase Price       $ 6,891,000
Transaction Costs       108,000
Total Acquisition Costs       $ 6,999,000
Subsequent Event | ALF and MC | 74-Unit ALF/MC        
Real estate investments        
Stockholders' Equity Attributable to Noncontrolling Interest 919,000      
Investment Commitment $ 15,950,000      
Subsequent Event | 2018 Acquisitions | ALF and MC | 74-Unit ALF/MC        
Real estate investments        
Number of beds/units acquired | item 919      
Real Estate Investment Economic Interest in Joint Venture Percentage 95.00%      
Number of beds/units under development | item 74      
Subsequent Event | 2018 Acquisitions | ALF and MC | 78-unit ALF/MC        
Real estate investments        
Contingent consideration $ 15,950,000