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Summary of secured and unsecured debt (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
USD ($)
Debt Instrument  
Long-term debt $ 12,087,732
Long-term debt, percentage bearing variable interest, amount, net 129,431
Total Consolidated $ 12,217,163
Percentage of Total 100.00%
Interest Rate 3.86%
Weighted Average Remaining Terms (in years) 13 years 4 months 24 days
Percentage of fixed rate/hedged total debt 98.90%
Percentage of unhedged floating rate total debt 1.10%
Principal $ 12,305,509
Commercial Paper  
Debt Instrument  
Weighted Average Remaining Terms (in years) 13 years 4 months 24 days
Principal $ 0
Weighted-average yield to maturity, commercial paper 5.60%
Weighted-average remaining maturity term, commercial paper 15 days
Secured notes payable  
Debt Instrument  
Long-term debt $ 619
Long-term debt, percentage bearing variable interest, amount, net 129,431
Total Consolidated $ 130,050
Percentage of Total 1.10%
Interest Rate 8.36%
Weighted Average Remaining Terms (in years) 2 years 8 months 12 days
Principal $ 130,509
Unsecured senior notes payable  
Debt Instrument  
Long-term debt 12,087,113
Long-term debt, percentage bearing variable interest, amount, net 0
Total Consolidated $ 12,087,113
Percentage of Total 98.90%
Interest Rate 3.81%
Weighted Average Remaining Terms (in years) 13 years 6 months
Unsecured senior line of credit  
Debt Instrument  
Total Consolidated $ 0
Unsecured senior line of credit | Commercial Paper  
Debt Instrument  
Long-term debt 0
Long-term debt, percentage bearing variable interest, amount, net 0
Total Consolidated $ 0
Percentage of Total 0.00%
Interest Rate 0.00%
Weighted Average Remaining Terms (in years) 3 years 9 months 18 days
Principal $ 0