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Note 3 - Operating Property Activities (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Disposal Groups, Including Discontinued Operations [Table Text Block]
   
Nine
Months Ended
September
30
,
 
   
2018
   
2017
 
Aggregate sales price/gross fair value
  $
973.5
    $
230.2
 
Gain on sale of operating properties/change in control of interests
  $
180.5
    $
62.1
 
Impairment charges
  $
16.3
    $
13.0
 
Number of operating properties sold/deconsolidated
   
45
     
15
 
Number of out-parcels sold
   
4
     
8