Major Operators (Details)	9 Months Ended
	Sep. 30, 2017 property item
Major Operators
Number of major operators	4
Prestige Healthcare | SNF
Major Operators
Number of beds | property	22
Number of beds/units	2,798
Prestige Healthcare | ALF
Major Operators
Number of beds/units	93
Senior Lifestyle Corporation | ALF
Major Operators
Number of beds | property	23
Number of beds/units	1,457
Brookdale Senior Living | ALF
Major Operators
Number of beds | property	37
Number of beds/units	1,702
Senior Care Centers | SNF
Major Operators
Number of beds | property	11
Number of beds/units	1,444
Operator Concentration Risk | SNF
Major Operators
Number of beds | property	33
Number of beds/units	4,242
Operator Concentration Risk | ALF
Major Operators
Number of beds | property	60
Number of beds/units	3,252
Total Revenue | Operator Concentration Risk
Major Operators
Concentration risk (as a percent)	47.90%
Total Revenue | Operator Concentration Risk | Prestige Healthcare
Major Operators
Concentration risk (as a percent)	16.70%
Total Revenue | Operator Concentration Risk | Senior Lifestyle Corporation
Major Operators
Concentration risk (as a percent)	11.90%
Total Revenue | Operator Concentration Risk | Brookdale Senior Living
Major Operators
Concentration risk (as a percent)	9.70%
Total Revenue | Operator Concentration Risk | Senior Care Centers
Major Operators
Concentration risk (as a percent)	9.60%
Total Assets | Operator Concentration Risk
Major Operators
Concentration risk (as a percent)	40.60%
Total Assets | Credit Concentration Risk | Prestige Healthcare
Major Operators
Concentration risk (as a percent)	16.10%
Total Assets | Credit Concentration Risk | Senior Lifestyle Corporation
Major Operators
Concentration risk (as a percent)	11.50%
Total Assets | Credit Concentration Risk | Brookdale Senior Living
Major Operators
Concentration risk (as a percent)	5.10%
Total Assets | Credit Concentration Risk | Senior Care Centers
Major Operators
Concentration risk (as a percent)	7.90%