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Borrowings Under Credit Facilities and Commercial Paper Program - Aggregate Borrowings Under Unsecured Revolving Credit Facility and Commercial Paper (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Debt Disclosure [Abstract] |  |
Balance outstanding at quarter end | $ 300,000 | $ 0
Maximum amount outstanding at any month end | 995,660 | 0
Average amount outstanding (total of daily principal balances divided by days in period) | $ 961,463 | $ 0
Weighted average interest rate (actual interest expense divided by average borrowings outstanding) | 0.53% | 0.00%

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