OTHER INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Intangible liabilities
Net	$ (4,349)		$ (1,070)
Future accretion of acquisition related intangible liabilities
Net	(4,349)		(1,070)
Acquired Below-Market Leases
Intangible liabilities
Gross balance	(6,711)		(2,902)
Accumulated amortization	2,362		1,832
Net	$ (4,349)		$ (1,070)
Average useful life (in years)	4 years		5 years
Future accretion of acquisition related intangible liabilities
2018 (Nine months ending December 31, 2018)	$ (1,477)
2019	(1,540)
2020	(751)
2021	(347)
2022	(234)
Thereafter	0
Net	(4,349)		$ (1,070)
Acquired Above-Market Leases
Intangible assets
Gross balance	146		37
Accumulated amortization	(12)		0
Net	$ 134		$ 37
Average useful life (in years)	3 years		7 years
Amortization
Amortization expense	$ 12	$ 3
Future amortization of acquisition related intangible assets
2018 (Nine months ending December 31, 2018)	39
2019	54
2020	18
2021	5
2022	5
Thereafter	13
Net	134		$ 37
Acquired In-Place Leases
Intangible assets
Gross balance	18,090		11,087
Accumulated amortization	(8,612)		(7,700)
Net	$ 9,478		$ 3,387
Average useful life (in years)	7 years		9 years
Amortization
Amortization expense	$ 912	216
Future amortization of acquisition related intangible assets
2018 (Nine months ending December 31, 2018)	2,779
2019	3,222
2020	1,535
2021	798
2022	562
Thereafter	582
Net	9,478		$ 3,387
Trade Name and License
Intangible assets
Gross balance	2,957		2,957
Accumulated amortization	0		0
Net	2,957		2,957
Future amortization of acquisition related intangible assets
Net	2,957		$ 2,957
Tax Abatement
Amortization
Amortization expense	0	138
Rental and Other Property Operating Expenses | Acquired Below-Market Ground Lease
Amortization
Amortization expense	0	35
Rental and Other Property Income | Acquired Below-Market Leases
Amortization
Amortization expense	$ 713	$ 419