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Summary of secured and unsecured debt (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
USD ($)
Debt Instrument  
Long-term debt $ 11,094,344
Long-term debt, percentage bearing variable interest, amount, net 108,491
Total Consolidated $ 11,202,835
Percentage of Total 100.00%
Interest Rate 3.70%
Weighted Average Remaining Terms (in years) 13 years 1 month 6 days
Percentage of fixed rate/hedged total debt 99.00%
Percentage of unhedged floating rate total debt 1.00%
Commercial Paper  
Debt Instrument  
Weighted Average Remaining Terms (in years) 13 years 1 month 6 days
Weighted-average yield to maturity, commercial paper 5.15%
Weighted-average remaining maturity term, commercial paper 13 days
Secured notes payable  
Debt Instrument  
Long-term debt $ 619
Long-term debt, percentage bearing variable interest, amount, net 108,491
Total Consolidated $ 109,110
Percentage of Total 1.00%
Interest Rate 8.35%
Weighted Average Remaining Terms (in years) 3 years 2 months 12 days
Unsecured senior notes payable  
Debt Instrument  
Long-term debt $ 11,093,725
Long-term debt, percentage bearing variable interest, amount, net 0
Total Consolidated $ 11,093,725
Percentage of Total 99.00%
Interest Rate 3.65%
Weighted Average Remaining Terms (in years) 13 years 2 months 12 days
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%
Weighted Average Remaining Terms (in years) 4 years 3 months 18 days