ACQUISITIONS OF REAL ESTATE PROPERTY (Narrative) (Details) $ in Millions	1 Months Ended	6 Months Ended
	Feb. 28, 2017 USD ($) property	Jun. 30, 2017 USD ($) property
Business Acquisition [Line Items]
Purchase price | $		$ 404.4
Triple-Net Leased Properties
Business Acquisition [Line Items]
Number of businesses acquired		14
Seniors Housing Communities
Business Acquisition [Line Items]
Property acquired previously owned by equity method investee	6	6
Purchase price | $	$ 100.0
Office Operations
Business Acquisition [Line Items]
Number of businesses acquired		1