OTHER ASSETS (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Straight-line rent receivables	$ 265,977
Straight-line rent receivables		$ 250,023
Non-mortgage loans receivable, net	59,570	54,164
Debt securities, available-for-sale, carrying value	230,618	206,442
Other intangibles, net	5,401	5,623
Investment in unconsolidated operating entities	54,118	56,820
Other	206,160	186,113
Total other assets	$ 821,844	$ 759,185