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Borrowings Under Credit Facilities and Commercial Paper Program - Unsecured Revolving Credit Facility (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Debt Disclosure [Abstract] |  |
Balance outstanding at quarter end | $ 0 | $ 300,000
Maximum amount outstanding at any month end | 205,000 | 995,660
Average amount outstanding (total of daily principal balances divided by days in period) | $ 65,833 | $ 961,463
Weighted average interest rate (actual interest expense divided by average borrowings outstanding) | 5.05% | 0.53%

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