Loans Receivables and Investments (Details) 2 - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Jul. 31, 2020	Apr. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt Securities, Held-to-maturity, Allowance for Credit Loss	$ (5,394)	$ (26,469)
Debt Securities, Available-for-sale	0	237,553
Non-mortgage loans receivable, net	19,024	57,077
Secured loans, unsecured loans, and other available-for-sale securities, amortized cost	552,707	899,028
Secured Loans, Unsecured Loans And Other Available-For-Sale Securities, Unrealized gain	1,836	27,638
Total loans receivable and investments, net	549,150	900,197
Secured loans, unsecured loans, and other available-for-sale securities, fair value	539,183	852,996
Brookdale Senior Living
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-mortgage loans receivable, net			$ 45,000
Non-mortgage loans receivable, net (2)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt Securities, Held-to-maturity, Allowance for Credit Loss	(5,394)	(17,623)
Non-mortgage loans receivable, amortized cost	24,418	74,700
Non-mortgage loans receivable, net, unrealized gain	0	0
Non-mortgage loans receivable, net	19,024	57,077
Non-mortgage loans receivable, fair value	19,039	57,009
Secured/mortgage loans and other, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt Securities, Held-to-maturity	488,913	555,840
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Fair Value	478,931	508,707
Secured/mortgage loans and other, net | Holiday Management Company Member
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt Securities, Held-to-maturity				$ 66,000
Secured/mortgage loans and other, net | Brookdale Senior Living
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt Securities, Held-to-maturity			$ 78,000
Government-sponsored pooled loan investments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	(8,846)
Debt Securities, Available-for-sale, Amortized Cost	39,376	55,154
Available-for-sale securities, unrealized gain (loss)	1,836	3,419
Debt Securities, Available-for-sale	41,213	49,727
Total investments reported as secured loans receivable and investments, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt Securities, Held-to-maturity, Allowance for Credit Loss	0	(8,846)
Available-for-sale securities, unrealized gain (loss)	1,836	3,419
Debt securities, available-for-sale and held-to-maturity, amortized cost	528,289	610,994
Debt securities, available-for-sale and held-to-maturity, carrying amount	530,126	605,567
Debt securities, Held-to-Maturity and Available-for-Sale, Fair Value	$ 520,144	558,434
Senior Unsecured Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt Securities, Held-to-maturity, Allowance for Credit Loss		0
Debt Securities, Available-for-sale, Amortized Cost		213,334
Available-for-sale securities, unrealized gain (loss)		24,219
Debt Securities, Available-for-sale		$ 237,553