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Segment Reporting - Schedule of Properties (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
unit
property
Real Estate Properties [Line Items]  
Properties Under Management | property 70
Units Under Management | unit 10,118
Property and Other Revenues | $ $ 185,655
Number of properties sold | property 2
Arbors Portfolio  
Real Estate Properties [Line Items]  
Write-off of straight-line rent receivables | $ $ 7,400
Revenue | Customer Concentration Risk  
Real Estate Properties [Line Items]  
Percentage of Total Property and Other Revenues 100.00%
Watermark Retirement Communities  
Real Estate Properties [Line Items]  
Properties Under Management | property 28
Units Under Management | unit 5,049
Property and Other Revenues | $ $ 98,586
Watermark Retirement Communities | Revenue | Customer Concentration Risk  
Real Estate Properties [Line Items]  
Percentage of Total Property and Other Revenues 53.10%
Solstice Senior Living  
Real Estate Properties [Line Items]  
Properties Under Management | property 32
Units Under Management | unit 4,000
Property and Other Revenues | $ $ 73,128
Solstice Senior Living | Revenue | Customer Concentration Risk  
Real Estate Properties [Line Items]  
Percentage of Total Property and Other Revenues 39.40%
Avamere Health Services  
Real Estate Properties [Line Items]  
Properties Under Management | property 5
Units Under Management | unit 453
Property and Other Revenues | $ $ 12,795
Avamere Health Services | Revenue | Customer Concentration Risk  
Real Estate Properties [Line Items]  
Percentage of Total Property and Other Revenues 6.90%
Arcadia Management  
Real Estate Properties [Line Items]  
Properties Under Management | property 4
Units Under Management | unit 572
Property and Other Revenues | $ $ (4,399)
Arcadia Management | Revenue | Customer Concentration Risk  
Real Estate Properties [Line Items]  
Percentage of Total Property and Other Revenues (2.40%)
Integral Senior Living  
Real Estate Properties [Line Items]  
Properties Under Management | property 1
Units Under Management | unit 44
Property and Other Revenues | $ $ 5,465
Integral Senior Living | Revenue | Customer Concentration Risk  
Real Estate Properties [Line Items]  
Percentage of Total Property and Other Revenues 2.90%
Other  
Real Estate Properties [Line Items]  
Properties Under Management | property 0
Units Under Management | unit 0
Property and Other Revenues | $ $ 80
Other | Revenue | Customer Concentration Risk  
Real Estate Properties [Line Items]  
Percentage of Total Property and Other Revenues 0.10%
Solstice Senior Living  
Real Estate Properties [Line Items]  
Noncontrolling interest, ownership percentage by parent (as a percentage) 80.00%