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Summary of secured and unsecured debt (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
USD ($)
Debt Instrument  
Long-term debt $ 12,090,180
Long-term debt, percentage bearing variable interest, amount, net 333,875
Total Consolidated $ 12,424,055
Percentage of Total 100.00%
Interest Rate 3.89%
Weighted Average Remaining Terms (in years) 13 years
Percentage of fixed rate/hedged total debt 97.30%
Percentage of unhedged floating rate total debt 2.70%
Principal $ 12,510,267
Commercial Paper  
Debt Instrument  
Weighted Average Remaining Terms (in years) 13 years
Principal $ 199,600
Weighted Average Interest Rate 5.57%
Weighted-average yield to maturity, commercial paper 5.59%
Weighted-average remaining maturity term, commercial paper 16 days
Secured notes payable  
Debt Instrument  
Long-term debt $ 619
Long-term debt, percentage bearing variable interest, amount, net 134,323
Total Consolidated $ 134,942
Percentage of Total 1.10%
Interest Rate 8.13%
Weighted Average Remaining Terms (in years) 2 years 4 months 24 days
Principal $ 135,267
Unsecured senior notes payable  
Debt Instrument  
Long-term debt 12,089,561
Long-term debt, percentage bearing variable interest, amount, net 0
Total Consolidated $ 12,089,561
Percentage of Total 97.30%
Interest Rate 3.81%
Weighted Average Remaining Terms (in years) 13 years 3 months 18 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 199,552
Total Consolidated $ 199,552
Percentage of Total 1.60%
Interest Rate 5.57%
Weighted Average Remaining Terms (in years) 3 years 7 months 6 days
Principal $ 200,000