BUSINESS COMBINATIONS AND ACQUIRED INTANGIBLES (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Amortization expense for lease intangibles	$ 944,000	$ 1,215,000	$ 3,129,000	$ 3,548,000
Above and below market leases Increase (decrease) rental Income	94,000	119,000	326,000	295,000
Acquisition-related costs expensed	$ 0	$ 0	$ 0	$ 160,000
Ridge Creek Distribution Center III, Colorado Crossing Distribution Center and Ramona Distribution Center[Domain]
Business Acquisition [Line Items]
Total cost of properties purchased					$ 51,652,000
Amount of total cost allocated to real estate properties					47,477,000
Amount of total cost allocated to land					10,822,000
Cash paid for acquired properties					48,805,000
Mortgages assumed in connection with purchase of real estate, face amount					2,617,000
Premium on mortgage loan, amount recognized at assumption of loan					230,000
Ridge Creek Distribution Center III, Colorado Crossing Distribution Center and Ramona Distribution Center[Domain] | Leases, Acquired-in-Place [Member]
Business Acquisition [Line Items]
Intangible acquired associated with purchase of Real Estate					5,074,000
Ridge Creek Distribution Center III, Colorado Crossing Distribution Center and Ramona Distribution Center[Domain] | Below market lease [Member]
Business Acquisition [Line Items]
Intangible acquired associated with purchase of Real Estate					903,000
Ridge Creek Distribution Center III, Colorado Crossing Distribution Center and Ramona Distribution Center[Domain] | Above Market Leases [Member]
Business Acquisition [Line Items]
Intangible acquired associated with purchase of Real Estate					$ 4,000