OTHER INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Intangible liabilities
Net	$ (3,351)		$ (3,351)		$ (1,070)
Future accretion of acquisition related intangible liabilities
Net	(3,351)		(3,351)		(1,070)
Acquired Below-Market Leases
Intangible liabilities
Gross balance	(6,618)		(6,618)		(2,902)
Accumulated amortization	3,267		3,267		1,832
Net	(3,351)		$ (3,351)		$ (1,070)
Average useful life (in years)			4 years		5 years
Future accretion of acquisition related intangible liabilities
2018 (Three months ending December 31, 2018)	(479)		$ (479)
2019	(1,540)		(1,540)
2020	(751)		(751)
2021	(347)		(347)
2022	(234)		(234)
Thereafter	0		0
Net	(3,351)		(3,351)		$ (1,070)
Acquired Below-Market Leases | Rental and Other Property Income
Amortization
Amortization expense	478	$ 231	1,711	$ 869
Acquired Below-Market Ground Lease | Rental and Other Property Operating Expenses
Amortization
Amortization expense	0	23	0	93
Acquired Above-Market Leases
Intangible assets
Gross balance	146		146		37
Accumulated amortization	(40)		(40)		0
Net	106		$ 106		$ 37
Average useful life (in years)			3 years		7 years
Amortization
Amortization expense	14	0	$ 40	3
Future amortization of acquisition related intangible assets
2018 (Three months ending December 31, 2018)	11		11
2019	54		54
2020	18		18
2021	5		5
2022	5		5
Thereafter	13		13
Net	106		106		$ 37
Acquired In-Place Leases
Intangible assets
Gross balance	17,988		17,988		11,087
Accumulated amortization	(10,367)		(10,367)		(7,700)
Net	7,621		$ 7,621		$ 3,387
Average useful life (in years)			7 years		9 years
Amortization
Amortization expense	927	212	$ 2,769	623
Future amortization of acquisition related intangible assets
2018 (Three months ending December 31, 2018)	922		922
2019	3,222		3,222
2020	1,535		1,535
2021	798		798
2022	562		562
Thereafter	582		582
Net	7,621		7,621		$ 3,387
Trade Name and License
Intangible assets
Gross balance	2,957		2,957		2,957
Accumulated amortization	0		0		0
Net	2,957		2,957		2,957
Future amortization of acquisition related intangible assets
Net	2,957		2,957		$ 2,957
Tax Abatement
Amortization
Amortization expense	$ 0	$ 0	$ 0	$ 276