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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 | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Debt Disclosure [Abstract] |  |  |  |
Balance outstanding at quarter end | $ 354,000 | $ 0 | $ 354,000 | $ 0
Maximum amount outstanding at any month end | 1,135,000 | 195,000 | 1,135,000 | 195,000
Average amount outstanding (total of daily principal balances divided by days in period) | $ 754,337 | $ 289,231 | $ 857,328 | $ 145,414
Weighted average interest rate (actual interest expense divided by average borrowings outstanding) | 1.36% | 0.76% | 0.90% | 0.76%

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