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Note 17 - Supplemental Schedule of Non-Cash Investing/Financing Activities (Details) - Non-Cash Investing and Financing Activities (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Note 17 - 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 $ 76,477 $ 179,198 $ 117,912
Acquisition of real estate interests through foreclosure 24,322    
Acquisition of real estate interests by issuance of redeemable units 3,985    
Acquisition of real estate interests through proceeds held in escrow 42,892    
Disposition of real estate interest by assignment of mortgage debt   17,083  
Disposition of real estate through the issuance of unsecured obligation 3,513 13,475 14,297
Issuance of common stock 9,213 18,115 4,941
Declaration of dividends paid in succeeding period 104,496 96,518 92,159
Consolidation of Joint Ventures:      
Increase in real estate and other assets 228,200    
Increase in mortgage payable 206,489    
Non-cash [Member]
      
Note 17 - Supplemental Schedule of Non-Cash Investing/Financing Activities (Details) - Non-Cash Investing and Financing Activities [Line Items]      
Surrender of common stock $ (3,891) $ (2,073) $ (596)