REAL ESTATE SOLD AND HELD FOR SALE DISCONTINUED OPERATIONS (Details)	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2018 USD ($) a	Sep. 30, 2019 USD ($) ft² Integer	Dec. 31, 2018 USD ($) ft² Integer
Property Held-for-Sale [Member]
Long Lived Assets Held-for-sale [Line Items]
Number of real estate properties classified as held for sale | Integer		3
2019 Operating Property Sales [Member] [Domain]
Long Lived Assets Held-for-sale [Line Items]
Square Footage of Real Estate Property | ft²		237,000
Gain (Loss) on Sale of Properties		$ 11,400,000
Proceeds from Sale of Property, Plant, and Equipment		$ 18,700,000
2018 Operating Property Sales [Member]
Long Lived Assets Held-for-sale [Line Items]
Square Footage of Real Estate Property | ft²			339,000
Gain (Loss) on Sale of Properties			$ 14,300,000
Proceeds from Sale of Property, Plant, and Equipment			$ 22,900,000
Number of real estate properties transferred to held for sale and sold | Integer			3
Land [Member]
Long Lived Assets Held-for-sale [Line Items]
Size (in acres) of land sold | a	11
Proceeds from Sale of Property, Plant, and Equipment	$ 2,600,000
Gain on sales of land	$ 86,000