OTHER ASSETS (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Other Assets Components [Abstract]
Leasing costs (principally commissions)	$ 61,182	$ 59,043
Accumulated amortization of leasing costs	(24,132)	(23,455)
Leasing costs (principally commissions), net of accumulated amortization	37,050	35,588
Straight-line rents receivable	27,021	26,482
Allowance for doubtful accounts on straight-line rents receivable	(137)	(167)
Straight-line rents receivable, net of allowance for doubtful accounts	26,884	26,315
Accounts receivable	3,514	5,615
Allowance for doubtful accounts on accounts receivable	(517)	(394)
Accounts receivable, net of allowance for doubtful accounts	2,997	5,221
Acquired in-place lease intangibles	17,642	19,061
Accumulated amortization of acquired in-place lease intangibles	(8,931)	(8,205)
Acquired in-place lease intangibles, net of accumulated amortization	8,711	10,856
Acquired above market lease intangibles	1,232	1,337
Accumulated amortization of acquired above market lease intangibles	(664)	(684)
Acquired above market lease intangibles, net of accumulated amortization	568	653
Mortgage loans receivable	4,815	4,875
Interest rate swap assets	0	400
Receivable for common stock offerings	4,950	0
Escrow deposits for 1031 exchange	4,805	0
Goodwill	990	990
Prepaid expenses and other assets	6,330	6,960
Other Assets Total	$ 98,100	$ 91,858