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Note 10 - Notes, Mortgages and Construction Loan Payable (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Gain (Loss) on Extinguishment of Debt, Total   $ (12,762) $ (1,753) $ (12,762) $ (1,753)  
Notes Payable, Total   4,409,500   4,409,500   $ 4,596,140
Senior Unsecured Note [Member]            
Gain (Loss) on Extinguishment of Debt, Total       (12,800)    
Notes Payable, Total   $ 484,900   484,900    
Non-recouse Mortgage Debt Related to Property Deconsolidated [Member]            
Debt Instrument, Increase (Decrease), Net, Total       206,000    
Repayments of Long-term Debt, Total       203,600    
Liabilities, Fair Value Adjustment       $ 900    
Construction Loan [Member]            
Debt Instrument, Commitment $ 67,000          
Debt Instrument, Interest Rate, Effective Percentage   3.96%   3.96%    
Long-term Debt, Total   $ 30,400   $ 30,400    
Construction Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument, Basis Spread on Variable Rate 1.80%          
Mortgages [Member]            
Debt Instrument, Increase (Decrease), Net, Total       12,400    
Mortgages [Member] | Other Income (Expense), Net [Member]            
Gain on Forgiveness of Debt       4,300    
Relief of Accrued Interest       $ 3,400