OTHER ASSETS (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Straight-line rent receivables	$ 258,136
Straight-line rent receivables		$ 250,023
Non-mortgage loans receivable, net	57,226	54,164
Debt securities, available-for-sale, carrying value	215,884	206,442
Other intangibles, net	5,513	5,623
Investment in unconsolidated operating entities	55,490	56,820
Other	204,660	186,113
Total other assets	$ 796,909	$ 759,185