OTHER ASSETS (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Other Assets Components [Abstract]
Leasing costs (principally commissions)	$ 93,513	$ 89,191
Accumulated amortization of leasing costs	(37,641)	(34,963)
Leasing costs (principally commissions), net of accumulated amortization	55,872	54,228
Acquired in-place lease intangibles	27,883	28,834
Accumulated amortization of acquired in-place lease intangibles	(13,236)	(11,918)
Acquired in-place lease intangibles, net of accumulated amortization	14,647	16,916
Acquired above market lease intangibles	1,723	1,721
Accumulated amortization of acquired above market lease intangibles	(1,118)	(1,007)
Acquired above market lease intangibles, net of accumulated amortization	605	714
Straight-line rents receivable	42,291	40,369
Accounts receivable	4,811	5,581
Mortgage loans receivable	1,665	1,679
Interest rate swap assets	0	3,485
Right of use assets - Office Leases (operating)	2,375	2,115
Goodwill	990	990
Prepaid expenses and other assets	17,186	18,545
Total Other Assets	$ 140,442	$ 144,622