SIGNIFICANT ACCOUNTING POLICIES (Financial Instruments Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments (asset position)	$ 47	$ 14
Derivative financial instruments (liability position)	(1,109)	(393)
Development property investments at fair value	316,254	549,684
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments (asset position)	0	0
Derivative financial instruments (liability position)	0	0
Development property investments at fair value	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments (asset position)	47	14
Derivative financial instruments (liability position)	(1,109)	(393)
Development property investments at fair value	0	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments (asset position)	0	0
Derivative financial instruments (liability position)	0	0
Development property investments at fair value	$ 316,254	$ 549,684