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Borrowings Under Credit Facilities and Commercial Paper Program (Tables)
9 Months Ended
Sep. 30, 2023
Debt Disclosure [Abstract]  
Summary of Aggregate Borrowings Under Unsecured Revolving Credit Facility and Commercial Paper The following information relates to aggregate borrowings under the unsecured revolving credit facility and commercial paper program for the periods presented (dollars in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2023202220232022
Balance outstanding at quarter end$$655,000 $$655,000
Maximum amount outstanding at any month end$$1,565,000 $205,000$1,565,000
Average amount outstanding (total of daily principal balances divided by days in period)$$1,047,631 $21,703$937,045
Weighted average interest rate (actual interest expense divided by average borrowings outstanding)— %2.76 %5.05 %1.58 %