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Real Property Acquisitions and Development (Narrative) (Details)
$ / shares in Units, $ in Millions
Jul. 26, 2018
USD ($)
property
renewal_option
$ / shares
Business Acquisition [Line Items]  
Seniors housing properties leased to operators under existing triple net leases 14
Multi tenant medical office building leased to various tenants 1
Quality Care Properties Inc. (QCP)  
Business Acquisition [Line Items]  
Business acquisition, share price (in dollars per share) | $ / shares $ 20.75
Business combination, consideration transferred | $ $ 3,500
Joint Venture With ProMedica  
Business Acquisition [Line Items]  
Equity method investment, ownership percentage 80.00%
ProMedica  
Business Acquisition [Line Items]  
Total senior housing properties leased 218
Operating lease, not yet commenced, term 15 years
Lease agreement number of renewal options | renewal_option 3
Operating lease, not yet commenced, renewal term 5 years
Proceeds from rents received | $ $ 179
Lease agreement escalator in year one 1.375%
Lease agreement annual escalator thereafter 2.75%
ProMedica | Joint Venture With ProMedica  
Business Acquisition [Line Items]  
Equity method investment, ownership percentage 20.00%
Held For Sale  
Business Acquisition [Line Items]  
Seniors housing properties leased under non yielding lease 59
Seniors housing properties leased to operators under existing triple net leases 12
Surgery center leased to operators under existing triple net leases 1