Real Estate Investments, Net (Geographic Concentrations) (Details) - property	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2021	Nov. 30, 2020	Nov. 02, 2020	Apr. 30, 2020	Jan. 31, 2020	Mar. 31, 2019
Geographic Concentration Risk | Sales Revenue, Net | Florida
Concentration Risk [Line Items]
Concentration risk, percentage	17.70%	20.60%	25.20%
Geographic Concentration Risk | Sales Revenue, Net | Michigan
Concentration Risk [Line Items]
Concentration risk, percentage			10.90%
Geographic Concentration Risk | Sales Revenue, Net | Pennsylvania
Concentration Risk [Line Items]
Concentration risk, percentage		10.40%
Seniors Housing Communities | Disposed by sale | Michigan
Concentration Risk [Line Items]
Number of properties held for sale	11	11			11
Seniors Housing Communities | Assets held for sale
Concentration Risk [Line Items]
Number of properties held for sale							11		1
Seniors Housing Communities | Assets held for sale | Michigan
Concentration Risk [Line Items]
Number of properties held for sale		4		4				14
Number of properties transferred	7					7