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INCOME PROPERTIES - 2016 Dispositions and Impairment Charges (Details)
3 Months Ended 9 Months Ended
Sep. 16, 2016
USD ($)
Jun. 30, 2016
property
Sep. 30, 2016
USD ($)
property
Dispositions of Income Properties      
Impairment charges     $ 2,180,730
Sold | 2016 dispositions of income property subject to a lease      
Dispositions of Income Properties      
Number of properties in the disposal group | property     19
Sales price     $ 74,300,000
Sold | April 2016 disposition of income property subject to a lease      
Dispositions of Income Properties      
Number of properties in the disposal group | property   1  
Sold | Portfolio Sale      
Dispositions of Income Properties      
Number of properties in the disposal group | property     14
Sales price $ 51,600,000   $ 51,600,000
Buyers' assumption of existing mortgage loan $ 23,100,000   23,100,000
Under contract to be sold or sold | April 2016 disposition of income property subject to a lease      
Dispositions of Income Properties      
Impairment charges     210,000
Under contract to be sold or sold | September 2016 disposition of income property subject to a lease      
Dispositions of Income Properties      
Impairment charges     $ 942,000