OTHER ASSETS (Details) - USD ($) $ in Thousands	Jun. 30, 2018		Dec. 31, 2017
Other Assets Components [Abstract]
Leasing costs (principally commissions)	$ 73,567		$ 72,722
Accumulated amortization of leasing costs	(27,926)		(27,973)
Leasing costs (principally commissions), net of accumulated amortization	45,641		44,749
Straight-line rents receivable	34,015		31,609
Allowance for doubtful accounts on straight-line rents receivable	(90)		(48)
Straight-line rents receivable, net of allowance for doubtful accounts	33,925		31,561
Accounts receivable	3,678		6,004
Allowance for doubtful accounts on accounts receivable	(413)		(577)
Accounts receivable, net of allowance for doubtful accounts	3,265		5,427
Acquired in-place lease intangibles	21,556		20,690
Accumulated amortization of acquired in-place lease intangibles	(10,109)		(8,974)
Acquired in-place lease intangibles, net of accumulated amortization	11,447		11,716
Acquired above market lease intangibles	1,533		1,550
Accumulated amortization of acquired above market lease intangibles	(890)		(794)
Acquired above market lease intangibles, net of accumulated amortization	643		756
Mortgage loans receivable	2,623		4,581
Interest rate swap assets	10,140		6,034
Receivable for common stock offerings	7,366	[1]	0
Goodwill	990		990
Prepaid expenses and other assets	7,278		10,215
Other Assets Total	$ 123,318		$ 116,029

[1] Payments were received in full on July 2 and 3, 2018.