ASSETS HELD FOR SALE (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues:
Rental and other property revenues	$ 33,505	$ 31,491	$ 96,194	$ 94,328
Expenses:
Property operating expenses	15,867	15,157	45,814	46,256
General and administrative	1,858	1,594	6,223	4,669
Total operating expenses	27,734	25,725	80,594	77,524
Net operating income	5,771	5,766	15,600	16,804
Other income (expenses):
Mortgage and loan interest	(15,555)	(14,245)	(43,823)	(45,218)
Total other income (expenses)	5,896	(8,967)	2,003	(35,236)
Net income (loss)	23,118	7,170	30,389	(8,091)
Real Estate Held For Sale [Member]
Revenues:
Rental and other property revenues	22,371	20,410	65,056	59,672
Total operating revenues	22,371	20,410	65,056	59,672
Expenses:
Property operating expenses	9,953	9,190	29,250	26,964
Depreciation and amortization	3,780	3,397	11,080	9,971
General and administrative	6	12	276	389
Total operating expenses	13,739	12,599	40,606	37,324
Net operating income	8,632	7,811	24,450	22,348
Other income (expenses):
Interest income	2	3	3	6
Other income (loss)	3	(47)	267	(70)
Mortgage and loan interest	(4,973)	(4,401)	(14,449)	(12,738)
Loan fee expense				(707)
Total other income (expenses)	(4,968)	(4,445)	(14,179)	(13,509)
Net income (loss)	$ 3,664	$ 3,366	$ 10,271	$ 8,839