OTHER ASSETS (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Assets Components [Abstract]
Leasing costs (principally commissions)	$ 78,985	$ 72,722
Accumulated amortization of leasing costs	(30,185)	(27,973)
Leasing costs (principally commissions), net of accumulated amortization	48,800	44,749
Straight-line rents receivable	36,365	31,609
Allowance for doubtful accounts on straight-line rents receivable	(343)	(48)
Straight-line rents receivable, net of allowance for doubtful accounts	36,022	31,561
Accounts receivable	6,033	6,004
Allowance for doubtful accounts on accounts receivable	(600)	(577)
Accounts receivable, net of allowance for doubtful accounts	5,433	5,427
Acquired in-place lease intangibles	21,696	20,690
Accumulated amortization of acquired in-place lease intangibles	(9,833)	(8,974)
Acquired In Place Lease Intangibles Net Of Accumulated Amortization	11,863	11,716
Acquired above market lease intangibles	1,465	1,550
Accumulated amortization of acquired above market lease intangibles	(902)	(794)
Acquired above market lease intangibles, net of accumulated amortization	563	756
Mortgage loans receivable	2,594	4,581
Interest rate swap assets	6,701	6,034
Goodwill	990	990
Prepaid expenses and other assets	8,265	10,215
Other Assets Total	$ 121,231	$ 116,029