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Note 2 - Real Estate (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Property Subject to or Available for Operating Lease [Table Text Block]
   
December 31,
  
   
201
8
    
201
7
  
Land:
                
Developed land
   $
2,783,959
     $
2,971,020
  
Undeveloped land
    
38,732
      
48,264
  
Total land
    
2,822,691
      
3,019,284
  
Buildings and improvements:
                
Buildings
    
5,697,269
      
6,047,413
  
Building improvements
    
1,696,440
      
1,653,581
  
Tenant improvements
    
730,623
      
753,501
  
Fixtures and leasehold improvements
    
42,635
      
45,795
  
Above-market leases
    
133,913
      
153,484
  
In-place leases and tenant relationships
    
512,235
      
577,870
  
Total buildings and improvements
    
8,813,115
      
9,231,644
  
Real estate
    
11,635,806
      
12,250,928
  
Accumulated depreciation and amortization (1)
    
(2,385,287
 )    
(2,433,053
 )
Total real estate, net
   $
9,250,519
     $
9,817,875
  
Above and Below Market Lease Tenant Relationships Future Amortization Income Expense [Table Text Block]
   
201
9
    
20
20
    
202
1
    
202
2
    
202
3
  
Above-market and below-market leases amortization, net
   $
13.4
     $
13.5
     $
13.8
     $
12.8
     $
12.5
  
In-place leases and tenant relationships amortization
   $
(32.4
 )   $
(24.7
 )   $
(19.1
 )   $
(14.6
 )   $
(10.9
 )