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Concentration of Credit Risk - Senior Living Operations (Details)
1 Months Ended 12 Months Ended
Jan. 31, 2018
USD ($)
property
Dec. 31, 2018
USD ($)
board_member
property
Concentration Risk [Line Items]    
Ownership interests in properties accounted for under the equity method   25.00%
Eclipse Senior Living    
Concentration Risk [Line Items]    
Ownership interests in properties accounted for under the equity method   34.00%
Number of board members appointed | board_member   2
Number of board members | board_member   6
Number of properties managed by third party | property 76  
Business Acquisition, Transaction Costs   $ 23,600,000
Business combination consideration transferred   $ 0
Remaining ownership percentage retained by investee   66.00%
Elmcroft Senior Living    
Concentration Risk [Line Items]    
Derecognition of straight line rent receivable $ 75,200,000  
Derecognition of straight line rent receivable offsetting reserve $ 75,200,000  
Seniors Housing Communities    
Concentration Risk [Line Items]    
Number of independent third party managed properties | property   355
Atria, Sunrise and ESL | Seniors Housing Communities    
Concentration Risk [Line Items]    
Number of independent third party managed properties | property   334