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Note 10 - Notes and Mortgages Payable (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
Jul. 31, 2022
Feb. 29, 2020
Jun. 30, 2022
Feb. 28, 2022
Dec. 31, 2021
Long-Term Line of Credit, Total     $ 0    
Notes Payable, Total     $ 7,056,644   $ 7,027,050
Senior Unsecured Notes 2 [Member]          
Debt Instrument, Interest Rate, Stated Percentage [1]     3.125%    
Notes Payable, Total     $ 313,900    
Senior Unsecured Notes 3 [Member]          
Debt Instrument, Interest Rate, Stated Percentage [2]     3.375%    
Notes Payable, Total     $ 288,400    
February 2022 Senior Unsecured Notes [Member]          
Debt Instrument, Face Amount       $ 600,000  
Debt Instrument, Interest Rate, Stated Percentage       3.20%  
Senior Unsecured Notes [Member]          
Debt Instrument, Redemption, Prepayment Charges     6,500    
Write off of Deferred Debt Issuance Cost     700    
Mortgage Relating to An Operating Property [Member]          
Proceeds from Issuance of Long-term Debt, Total     19,000    
Repayments of Long-Term Debt, Total     115,300    
Mortgage Debt Encumbered Operating Property [Member]          
Liabilities, Fair Value Adjustment     $ 200    
Revolving Credit Facility [Member]          
Line of Credit Facility, Current Borrowing Capacity   $ 2,000,000      
Debt Instrument, Interest Rate, Effective Percentage     2.55%    
Line of Credit Facility, Maximum Borrowing Capacity   $ 2,750,000      
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument, Basis Spread on Variable Rate   0.765%      
Revolving Credit Facility [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | Subsequent Event [Member] | Minimum [Member]          
Debt Instrument, Basis Spread on Variable Rate 0.01%        
Revolving Credit Facility [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | Subsequent Event [Member] | Maximum [Member]          
Debt Instrument, Basis Spread on Variable Rate 0.05%        
Letter of Credit [Member]          
Long-Term Line of Credit, Total     $ 1,200    
[1] Represents partial repayments. As of June 30, 2022, these notes had an outstanding principal of $313.9 million
[2] Represents partial repayments. As of June 30, 2022, these notes had an outstanding principal of $288.4 million.