SUBSEQUENT EVENTS (Details) - USD ($) shares in Millions	1 Months Ended	3 Months Ended
	Apr. 29, 2016	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Subsequent Event [Line Items]
Proceeds from issuance of common stock		$ 32,026,000	$ 18,605,000
Net carrying amounts of notes receivable		154,679,000		$ 147,188,000
Heritage Shops | Chicago, Illinois | Fund III | Subsequent Event
Subsequent Event [Line Items]
Disposal group, consideration	$ 46,500,000
Forward Sale and Underwritten Public Offering | Subsequent Event
Subsequent Event [Line Items]
Common stock issued during the period (in shares)	3.6
Proceeds from issuance of common stock	$ 125,000,000
Mezzanine Loan, 15% Loan, Due 2020
Subsequent Event [Line Items]
Net carrying amounts of notes receivable		$ 30,879,000		$ 30,879,000
Effective interest rate		15.00%
Unsecured Debt | Unsecured Credit Facility | Subsequent Event
Subsequent Event [Line Items]
Amount borrowed on unsecured credit facility	130,000,000.0
Secured Debt | Unsecured Credit Facility | Subsequent Event
Subsequent Event [Line Items]
Amount repaid on subscription line	140,000,000
Affiliated Entity | Mezzanine Loan, 15% Loan, Due 2020 | Subsequent Event
Subsequent Event [Line Items]
Payment amount	42,700,000
Affiliated Entity | 8.1% Interest Bearing Note, Due April 30, 2019 | Subsequent Event
Subsequent Event [Line Items]
Net carrying amounts of notes receivable	$ 153,400,000
Effective interest rate	8.10%