OTHER ASSETS (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Straight-line rent receivables	$ 164,161
Straight-line rent receivables, net		$ 278,833
Non-mortgage loans receivable, net	56,844	63,724
Debt securities, available-for-sale, carrying value	231,168	237,360
Other intangible assets, net	4,748	5,149
Investment in unconsolidated operating entities	43,116	59,301
Other	252,498	233,349
Other assets	$ 779,475	$ 877,716