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Subsequent Events (Property Dispositions) (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 11, 2017
USD ($)
property
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
property
Jun. 30, 2016
USD ($)
Subsequent Event          
Proceeds from disposition of properties       $ 16,973,000 $ 9,865,000
Gain on dispositions of real estate, net   $ 1,452,000 $ 114,000 $ 1,452,000 $ 114,000
Property Dispositions, 2017          
Subsequent Event          
Number of properties disposed | property       11  
Aggregate gross sales price       $ 17,700,000  
Proceeds from disposition of properties       17,000,000  
Gain on dispositions of real estate, net       1,500,000  
Disposition fee | Affiliated entity | Property Dispositions, 2017          
Subsequent Event          
Disposition fees paid       $ 0  
Subsequent event | Property Dispositions, 2017          
Subsequent Event          
Number of properties disposed | property 1        
Aggregate gross sales price $ 2,900,000        
Proceeds from disposition of properties 2,800,000        
Gain on dispositions of real estate, net 465,000        
Subsequent event | Disposition fee | Affiliated entity | Property Dispositions, 2017          
Subsequent Event          
Disposition fees paid $ 0