OTHER ASSETS (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Other Assets Components [Abstract]
Leasing costs (principally commissions)	$ 72,343	$ 72,722
Accumulated amortization of leasing costs	(27,404)	(27,973)
Leasing costs (principally commissions), net of accumulated amortization	44,939	44,749
Straight-line rents receivable	32,574	31,609
Allowance for doubtful accounts on straight-line rents receivable	(81)	(48)
Straight-line rents receivable, net of allowance for doubtful accounts	32,493	31,561
Accounts receivable	4,114	6,004
Allowance for doubtful accounts on accounts receivable	(616)	(577)
Accounts receivable, net of allowance for doubtful accounts	3,498	5,427
Acquired in-place lease intangibles	20,690	20,690
Accumulated amortization of acquired in-place lease intangibles	(9,986)	(8,974)
Acquired in-place lease intangibles, net of accumulated amortization	10,704	11,716
Acquired above market lease intangibles	1,550	1,550
Accumulated amortization of acquired above market lease intangibles	(850)	(794)
Acquired above market lease intangibles, net of accumulated amortization	700	756
Mortgage loans receivable	2,623	4,581
Interest rate swap assets	8,950	6,034
Goodwill	990	990
Prepaid expenses and other assets	8,336	10,215
Other Assets Total	$ 113,233	$ 116,029