Loans Receivable - Narrative (Details) £ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2023 GBP (£)	Dec. 31, 2021 USD ($) property	Dec. 31, 2023 GBP (£)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 GBP (£) property
Financing Receivable, Troubled Debt Restructuring [Line Items]
Other liabilities	$ 31,798				$ 22,878
Real estate loans receivable, net of credit allowance	1,361,587				$ 890,844
Triple-net
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of real estate properties | property			51			51
Safanad
Financing Receivable, Troubled Debt Restructuring [Line Items]
Real estate loans receivable, net of credit allowance	779,175		$ 750,330	£ 611,453		£ 540,000
Working capital facility | £						£ 30,000
Increase in receivable | £		£ 65,000
Genesis Health Care Corporation
Financing Receivable, Troubled Debt Restructuring [Line Items]
Termination fee			86,310
Proceeds from fees	85,043
Decrease in indebtedness	238,104		$ 169,771
Genesis Health Care Corporation | Senior Unsecured Notes
Financing Receivable, Troubled Debt Restructuring [Line Items]
Real estate loans receivable, net of credit allowance	24,246
Loan Carrying Value	290,296
Genesis Health Care Corporation | Secured debt
Financing Receivable, Troubled Debt Restructuring [Line Items]
Real estate loans receivable, net of credit allowance	$ 166,859