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Note 14 - Supplemental Schedule of Non-Cash Investing/Financing Activities (Details) - Non-Cash Investing and Financing Activities (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Note 14 - Supplemental Schedule of Non-Cash Investing/Financing Activities (Details) - Non-Cash Investing and Financing Activities [Line Items]      
Acquisition of real estate interests by assumption of mortgage debt $ 210,232 $ 36,716  
Acquisition of real estate interests by issuance of redeemable units/partnership interest 6,122 3,985  
Acquisition of real estate interests through proceeds held in escrow 71,116    
Acquisition of real estate interests through mortgage receivable foreclosure   24,322  
Proceeds held in escrow through sale of real estate interests 147,728    
Issuance of restricted common stock 13,835 9,213  
Disposition of real estate through the issuance of an unsecured obligation   3,513  
Declaration of dividends paid in succeeding period 104,858 98,334 104,496
Consolidation of Joint Ventures:      
Increase in real estate and other assets 509,839 228,200  
Increase in mortgages payable 373,879 206,489  
Non-cash [Member]
      
Note 14 - Supplemental Schedule of Non-Cash Investing/Financing Activities (Details) - Non-Cash Investing and Financing Activities [Line Items]      
Surrender of restricted common stock $ (3,981) $ (3,851)