INVESTMENT IN UNCONSOLIDATED VENTURES - Balance Sheet Information (Details) $ in Thousands	Dec. 31, 2019 USD ($) property	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)		Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of properties | property	8
ASSETS
Real estate investment property, net	$ 169,689	$ 151,046	$ 152,106	$ 175,785	$ 176,942	[1]	$ 160,019	$ 120,539	$ 121,525
Cash and cash equivalents	22,699	9,371	8,305	11,794	23,539	[1]	18,185	15,236	19,816
Deposits and escrows	1,986	2,877	2,994	2,609	3,299	[1]	3,469	2,286	1,725
Other assets	5,296	4,183	4,304	3,505	1,596	[1]	1,682	1,383	1,259
Total Assets	390,610	369,610	393,067	388,908	394,990	[1]	374,529	343,866	340,718
Liabilities:
Mortgages payable	133,215	116,855	136,559	137,239	137,946	[1]	123,817	95,623	96,091
Accounts payable and accrued liabilities	20,772	22,166	21,057	17,926	16,182	[1]	14,912	14,587	14,238
Total Liabilities	191,050	179,609	203,592	192,213	191,171	[1]	175,767	147,243	147,357
Commitments and contingencies
Equity [Abstract]
Total unconsolidated joint venture equity	199,653	190,016	189,155	196,378	203,488	[1]	198,420	196,254	193,021
Total Liabilities and Equity	390,610	369,610	393,067	388,908	394,990	[1]	374,529	343,866	340,718
Investment in unconsolidated joint ventures	177,071	$ 187,044	$ 188,224	$ 182,802	176,684	[1]	$ 179,588	$ 191,742	$ 183,491
Real estate properties, net of accumulated depreciation	24,094				22,271
Deferred mortgage costs	1,160				1,451
Mortgages
Equity [Abstract]
Deferred mortgage costs	$ 823				1,904
Unconsolidated joint ventures
Schedule of Equity Method Investments [Line Items]
Number of properties | property	30
ASSETS
Real estate investment property, net	$ 1,070,941				1,007,302
Cash and cash equivalents	12,804				10,769
Deposits and escrows	23,912				27,740
Other assets	4,136				6,913
Total Assets	1,111,793				1,052,724
Liabilities:
Mortgages payable	803,289				736,290
Accounts payable and accrued liabilities	19,731				20,823
Total Liabilities	823,020				757,113
Equity [Abstract]
Total unconsolidated joint venture equity	288,773				295,611
Total Liabilities and Equity	1,111,793				1,052,724
Investment in unconsolidated joint ventures	177,071				176,684
Real estate properties, net of accumulated depreciation	104,001				71,762
Unconsolidated joint ventures | Mortgages
Equity [Abstract]
Deferred mortgage costs	$ 5,839				$ 5,807

[1] * Amounts restated See footnotes 2 and 16 for more information.