INVESTMENTS IN REAL ESTATE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Real Estate [Abstract]
Land	$ 273,984		$ 273,984		$ 221,785
Land improvements	18,501		18,501		17,745
Buildings and improvements	922,541		922,541		847,849
Furniture, fixtures, and equipment	3,219		3,219		3,363
Tenant improvements	140,345		140,345		128,876
Work in progress	8,562		8,562		9,162
Investments in real estate	1,367,152		1,367,152		1,228,780
Accumulated depreciation	(291,221)		(291,221)		(271,055)
Net investments in real estate	1,075,931		1,075,931		$ 957,725
Depreciation expense	$ 10,907	$ 12,670	$ 21,586	$ 27,354