REAL ESTATE HELD FOR SALE DISCONTINUED OPERATIONS (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($) ft² properties	Dec. 31, 2014 USD ($) ft² Integer
Ambassador Row Warehouse (one building sold in 2015) [Member]
Long Lived Assets Held-for-sale [Line Items]
Number of real estate properties transferred to held for sale and sold | properties	1
Square Footage of Real Estate Property | ft²	185,000
Gain (Loss) on Sale of Properties	$ 2,903,000
Proceeds from Sale of Property, Plant, and Equipment	5,250,000
Northpoint, Tampa West VI, Clay Campbell, Kirby and Ambassador (two buildings) property sales [Member]
Long Lived Assets Held-for-sale [Line Items]
Number of real estate properties transferred to held for sale and sold | Integer		5
Square Footage of Real Estate Property | ft²		442,000
Gain (Loss) on Sale of Properties		$ 9,188,000
Proceeds from Sale of Property, Plant, and Equipment		21,381,000
Land [Member]
Long Lived Assets Held-for-sale [Line Items]
Proceeds from Sale of Property, Plant, and Equipment	170,000	141,000
Gain on sales of land	$ 123,000	$ 98,000