SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Redeemable Common Stock) (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Jun. 30, 2017	Feb. 16, 2016	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 17, 2019	Dec. 06, 2018	Jun. 06, 2017
Summary of Significant Accounting Policies [Line Items]
Estimated net asset value per share common stock (in dollars per share)						$ 10.25	$ 9.65	$ 9.05
Redemptions of common stock			$ 3,048	$ 2,441	$ 1,359
Other liabilities			12,776	$ 13,176
Held for One Year
Summary of Significant Accounting Policies [Line Items]
Share holding term	1 year	1 year
Held for Two Years
Summary of Significant Accounting Policies [Line Items]
Share holding term	2 years	2 years
Held for Three Years
Summary of Significant Accounting Policies [Line Items]
Share holding term	3 years	3 years
Held for Four Years
Summary of Significant Accounting Policies [Line Items]
Share holding term	4 years	4 years
Amendment of Share Redemption Program
Summary of Significant Accounting Policies [Line Items]
Holding requirement		1 year
Additional funds for share redemption			500
Period of increase or decrease of funding available for redemption		10 days
Maximum percentage of weighted-average shares outstanding available for redemption during any calendar year		5.00%
Estimated value per share of company's common stock (in dollars per share)		$ 9.01
Amendment of Share Redemption Program | Held for One Year
Summary of Significant Accounting Policies [Line Items]
Redemption price percentage of most recent estimated value per share	92.50%	92.50%
Amendment of Share Redemption Program | Held for Two Years
Summary of Significant Accounting Policies [Line Items]
Redemption price percentage of most recent estimated value per share	95.00%	95.00%
Amendment of Share Redemption Program | Held for Three Years
Summary of Significant Accounting Policies [Line Items]
Redemption price percentage of most recent estimated value per share	97.50%	97.50%
Amendment of Share Redemption Program | Held for Four Years
Summary of Significant Accounting Policies [Line Items]
Redemption price percentage of most recent estimated value per share	100.00%	100.00%
Unfulfilled Redemption Request
Summary of Significant Accounting Policies [Line Items]
Other liabilities			2,200
Common Stock
Summary of Significant Accounting Policies [Line Items]
Redemptions of common stock			$ 3,000
Number of shares non-redeemable do to limitation (in shares)			863,378
Number of shares non-redeemable do to limitation			$ 8,700