BUSINESS COMBINATIONS AND ACQUIRED INTANGIBLES (Details) (USD $)	3 Months Ended		9 Months Ended						12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Northfield Distribution Center and Interchange Park II [Domain]	Sep. 30, 2013 Northfield Distribution Center and Interchange Park II [Domain] Leases, Acquired-in-Place [Member]	Sep. 30, 2013 Northfield Distribution Center and Interchange Park II [Domain] Below market lease [Member]	Sep. 30, 2013 Northfield Distribution Center and Interchange Park II [Domain] Above Market Leases [Member]	Dec. 31, 2012 Madison Distribution Center, Wiegman Distribution Center II and Valwood Distribution Center [Member]	Dec. 31, 2012 Madison Distribution Center, Wiegman Distribution Center II and Valwood Distribution Center [Member] Leases, Acquired-in-Place [Member]	Dec. 31, 2012 Madison Distribution Center, Wiegman Distribution Center II and Valwood Distribution Center [Member] Below market lease [Member]	Dec. 31, 2012 Madison Distribution Center, Wiegman Distribution Center II and Valwood Distribution Center [Member] Above Market Leases [Member]
Business Acquisition [Line Items]
Amortization expense for lease intangibles	$ 1,284,000	$ 881,000	$ 3,061,000	$ 2,927,000
Above and below market leases Increase (decrease) rental Income	93,000	(91,000)	68,000	(325,000)
Total cost of properties purchased					72,397,000				51,750,000
Amount of total cost allocated to real estate properties					65,387,000				48,934,000
Amount of total cost allocated to land					13,218,000				7,435,000
Intangible acquired associated with purchase of Real Estate						8,399,000	1,547,000	158,000		3,305,000	733,000	244,000
Acquisition-related costs expensed	$ 16,000	$ 45,000	$ 183,000	$ 64,000