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Borrowings Under Credit Facilities and Commercial Paper Program - Unsecured Revolving Credit Facility (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
[1]
Debt Disclosure [Abstract]      
Balance outstanding at quarter end $ 0 $ 0 $ 0
Maximum amount outstanding at any month end 0 205,000  
Average amount outstanding (total of daily principal balances divided by days in period) $ 0 $ 65,833  
Weighted average interest rate (actual interest expense divided by average borrowings outstanding) 0.00% 5.05%  
[1] The consolidated balance sheet at December 31, 2023 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.