RELATED PARTY ARRANGEMENTS Due to Affiliates (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Due to affiliate	$ 14,999	$ 7,843
Unamortized discount	(901)	(1,217)
Note to Affiliate, net of unamortized discount	4,482	7,733
RREEF America
Related Party Transaction [Line Items]
Note to Affiliate	5,383	8,950
Unamortized discount	(901)	(1,217)
Note to Affiliate, net of unamortized discount	4,482	7,733
Reimbursable under the Advisory Agreement | RREEF America
Related Party Transaction [Line Items]
Due to affiliate	115	67
Reimbursable under Dealer Manager Agreement | DWS Distributors
Related Party Transaction [Line Items]
Due to affiliate	57	193
Adviory Fees | RREEF America
Related Party Transaction [Line Items]
Due to affiliate	532	1,244
Trailing Fee
Related Party Transaction [Line Items]
Due to affiliate	114	118
Trailing Fee | DWS Distributors
Related Party Transaction [Line Items]
Due to affiliate	$ 14,295	$ 6,339