REAL ESTATE SOLD AND HELD FOR SALE DISCONTINUED OPERATIONS (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2017 USD ($) a	Dec. 31, 2016 USD ($) ft² a
Sale of Northwest Point, North Stemmons II and III, America Plaza, Lockwood, West Loop 1 & 2, two of four Interstate Commons Distribution Center buildings, Castilian and Memphis I [Member]
Long Lived Assets Held-for-sale [Line Items]
Square Footage of Real Estate Property | ft²		1,256,000
Gain (Loss) on Sale of Properties		$ 42,200,000
Proceeds from Sale of Property, Plant, and Equipment		$ 75,700,000
Land [Member]
Long Lived Assets Held-for-sale [Line Items]
SIze (in acres) of land sold | a	5	25
Proceeds from Sale of Property, Plant, and Equipment	$ 850,000	$ 5,400,000
Loss on sales of land	$ (40,000)
Gain on sales of land		$ 733,000