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OTHER INCOME ITEMS - Lease Termination Fees (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
OTHER INCOME ITEMS        
Lease termination fee received from an industrial tenants in a lease buy-out transaction $ 2,236,000 $ 650,000 $ 2,886,000 $ 1,269,000
Write-off of entire balance of the unbilled rent receivable and the intangible lease asset     $ 530,000 $ 150,000