Credit Concentration (Details) £ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2022 GBP (£)	Dec. 31, 2022 property	Dec. 31, 2022 properties
Concentration Risk [Line Items]
Total NOI	$ 2,301,845	$ 1,967,553	$ 2,008,144
Percentage total investments with top five customers		34.00%
Revenues	5,860,615	$ 4,742,115	$ 4,605,967
Gain on termination of lease	58,621
Real estate loans receivable, net of credit allowance	890,844	$ 1,068,681
Sunrise
Concentration Risk [Line Items]
Revenues	836,713
HC-One Group
Concentration Risk [Line Items]
Real estate loans receivable, net of credit allowance | £				£ 517,099
Net Operating Income | Credit Concentration Risk
Concentration Risk [Line Items]
Number of properties | property					1,743
Total NOI	$ 2,301,845
Percent of NOI	100.00%
Net Operating Income | Credit Concentration Risk | ProMedica
Concentration Risk [Line Items]
Number of properties | property					58
Total NOI	$ 240,128
Percent of NOI	10.00%
Net Operating Income | Credit Concentration Risk | Sunrise
Concentration Risk [Line Items]
Number of properties | property					109
Total NOI	$ 158,576
Percent of NOI	7.00%
Net Operating Income | Credit Concentration Risk | Atria Senior Living
Concentration Risk [Line Items]
Number of properties | property					97
Total NOI	$ 145,252
Percent of NOI	6.00%
Net Operating Income | Credit Concentration Risk | HC-One Group
Concentration Risk [Line Items]
Number of properties					1	1
Total NOI	$ 86,667
Percent of NOI	4.00%
Net Operating Income | Credit Concentration Risk | Cogir Management Corporation
Concentration Risk [Line Items]
Number of properties | property					48
Total NOI	$ 77,115
Percent of NOI	3.00%
Net Operating Income | Credit Concentration Risk | Remaining portfolio
Concentration Risk [Line Items]
Number of properties | property					1,430
Total NOI	$ 1,594,107
Percent of NOI	70.00%