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Leases - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
facility
Mar. 31, 2019
USD ($)
property
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
property
Dec. 31, 2017
USD ($)
Capital Leased Assets [Line Items]          
Conversion of DFLs to real estate     $ 350,540 $ 0 $ 0
Intangible assets, net     $ 331,693 $ 305,079  
Properties subject to direct financing leases (in properties)     2 29  
Impairments (recoveries), net     $ 225,937 $ 55,260 166,384
Senior housing triple-net          
Capital Leased Assets [Line Items]          
Impairments (recoveries), net         $ 23,000
SHOP          
Capital Leased Assets [Line Items]          
Number of leases disposed of (in facilities) | facility 13        
Proceeds from sale of lease receivables $ 274,000        
Impairments (recoveries), net $ 10,000     $ 52,000  
DFL Portfolio | Watch List DFLs | Senior housing triple-net          
Capital Leased Assets [Line Items]          
Properties with derecognized carrying value during the period (in properties) | property   14      
Conversion of DFLs to real estate   $ 351,000      
DFL Portfolio | Watch List DFLs | SHOP          
Capital Leased Assets [Line Items]          
Properties subject to direct financing leases (in properties) | property   14      
DFL Portfolio | Real Estate Investment | Watch List DFLs | SHOP          
Capital Leased Assets [Line Items]          
Real Estate Investment Property, at Cost   $ 331,000      
DFL Portfolio | Finite-Lived Intangible Assets | Watch List DFLs | SHOP          
Capital Leased Assets [Line Items]          
Intangible assets, net   $ 20,000