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Notes Payable and Unsecured Credit Facilities Schedule of maturities of long-term debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
2020 $ 43,921  
2021 85,699  
2022 1,287,645  
2023 69,498  
2024 346,043  
Beyond 5 Years 2,608,015  
Unamortized debt premium/(discount) and issuance costs (25,964)  
Total 4,414,857 $ 3,919,544
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Total 2,945,429 $ 2,944,752
Scheduled Principal Payments [Member] | Mortgages [Member]    
Debt Instrument [Line Items]    
2020 8,671  
2021 11,598  
2022 11,797  
2023 10,124  
2024 5,301  
Beyond 5 Years 21,712  
Unamortized debt premium/(discount) and issuance costs 0  
Total 69,203  
Mortgage Loan Maturities [Member] | Mortgages [Member]    
Debt Instrument [Line Items]    
2020 35,250  
2021 74,101  
2022 5,848  
2023 59,374  
2024 90,742  
Beyond 5 Years 161,303  
Unamortized debt premium/(discount) and issuance costs 4,150  
Total 430,768  
Unsecured Maturities [Member] | Unsecured Debt [Member]    
Debt Instrument [Line Items]    
2020 0  
2021 0  
2022 1,270,000  
2023 0  
2024 250,000  
Beyond 5 Years 2,425,000  
Unamortized debt premium/(discount) and issuance costs (30,114)  
Total $ 3,914,886