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Borrowings Under Credit Facilities and Commercial Paper Program - Unsecured Revolving Credit Facility (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Line of Credit Facility [Abstract]      
Balance outstanding at year end $ 0 $ 0 $ 0
Maximum amount outstanding at any month end 0 205,000 1,565,000
Average amount outstanding (total of daily principal balances divided by days in period) $ 0 $ 16,233 $ 766,167
Weighted average interest rate (actual interest expense divided by average borrowings outstanding) 0.00% 5.05% 1.75%