Major Operators (Details)	3 Months Ended
	Mar. 31, 2018 property item
Major Operators
Number of major operators	4
Prestige Healthcare | SNF
Major Operators
Number of beds | property	23
Number of beds/units	2,898
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	34
Number of beds/units	4,342
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)	48.10%
Total Revenue | Operator Concentration Risk | Prestige Healthcare
Major Operators
Concentration risk (as a percent)	17.20%
Total Revenue | Operator Concentration Risk | Senior Lifestyle Corporation
Major Operators
Concentration risk (as a percent)	11.60%
Total Revenue | Operator Concentration Risk | Brookdale Senior Living
Major Operators
Concentration risk (as a percent)	9.80%
Total Revenue | Operator Concentration Risk | Senior Care Centers
Major Operators
Concentration risk (as a percent)	9.50%
Total Assets | Operator Concentration Risk
Major Operators
Concentration risk (as a percent)	39.60%
Total Assets | Credit Concentration Risk | Prestige Healthcare
Major Operators
Concentration risk (as a percent)	16.30%
Total Assets | Credit Concentration Risk | Senior Lifestyle Corporation
Major Operators
Concentration risk (as a percent)	10.90%
Total Assets | Credit Concentration Risk | Brookdale Senior Living
Major Operators
Concentration risk (as a percent)	4.90%
Total Assets | Credit Concentration Risk | Senior Care Centers
Major Operators
Concentration risk (as a percent)	7.50%