Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jul. 31, 2020	Dec. 31, 2019
Other Assets Disclosure [Line Item]
Deferred Rent Receivable	$ 169,711
Straight-line rent receivables	169,700		$ 278,833
Non-mortgage loans receivable, net	57,077		63,724
Marketable debt securities	237,553		237,360
Other intangibles, net	4,659		5,149
Investment in unconsolidated operating entities	63,768		59,301
Other	224,363		233,349
Total other assets	807,229		877,716
Brookdale Senior Living
Other Assets Disclosure [Line Item]
Non-mortgage loans receivable, net		$ 45,000
Stock warrants		$ 28,000
Brookdale Senior Living | Carrying Amount
Other Assets Disclosure [Line Item]
Stock warrants	$ 50,098		$ 0