OTHER ASSETS (Details) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Other Assets Components [Abstract]
Leasing costs (principally commissions)		$ 81,051	$ 78,985
Accumulated amortization of leasing costs		(31,534)	(30,185)
Leasing costs (principally commissions), net of accumulated amortization		49,517	48,800
Acquired in-place lease intangibles		21,425	21,696
Accumulated amortization of acquired in-place lease intangibles		(10,553)	(9,833)
Acquired in-place lease intangibles, net of accumulated amortization		10,872	11,863
Acquired above market lease intangibles		1,454	1,465
Accumulated amortization of acquired above market lease intangibles		(941)	(902)
Acquired above market lease intangibles, net of accumulated amortization		513	563
Straight-line rents receivable		36,725	36,022
Accounts receivable		3,959	5,433
Mortgage loans receivable		2,591	2,594
Interest rate swap assets		4,497	6,701
Right of use assets - Office Leases	[1]	2,376	0
Goodwill		990	990
Prepaid expenses and other assets		8,381	8,265
Total Other Assets		$ 120,421	$ 121,231

[1] See Note 20 for information regarding the Company’s January 1, 2019, implementation of FASB ASC 842, Leases, and the Company’s right of use assets for office leases.