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Long-term Debt and Short-term Borrowings (Components of Short-term Borrowings) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Disclosure [Abstract] |  |  |
Total balance at December 31, | $ 235,639 | $ 1,919,250 | $ 887,692
Weighted average interest rate at December 31, | 0.11% | 1.60% | 1.93%
Maximum month-end balance during the year | $ 1,973,523 | $ 2,431,012 | $ 887,692
Average amount outstanding during the year | $ 685,664 | $ 1,360,214 | $ 371,933
Weighted average interest rate during the year | 1.15% | 1.93% | 0.96%

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