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Borrowings Under Credit Facilities and Commercial Paper Program (Tables) | 6 Months Ended
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Jun. 30, 2022
Debt Disclosure [Abstract] |
Aggregate Borrowings Under Unsecured Revolving Credit Facility and Commercial Paper | The following information relates to aggregate borrowings under the unsecured revolving credit facility and commercial paper program for the periods presented (dollars in thousands):
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2022 |  | 2021 |  | 2022 |  | 2021
Balance outstanding at quarter end |  | $ | 354,000 |  | $ | — |  |  | $ | 354,000 |  | $ | —
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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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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