OTHER ASSETS (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Straight-line rent receivables	$ 272,566
Straight-line rent receivables, net		$ 250,023
Non-mortgage loans receivable, net	62,852	54,164
Debt securities, available-for-sale, carrying value	227,947	206,442
Other intangible assets, net	5,262	5,623
Investment in unconsolidated operating entities	56,117	56,820
Other	228,051	186,113
Other assets	$ 852,795	$ 759,185