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Long-term Debt and Short-term Borrowings (Components of Short-term Borrowings) (Details) - USD ($) $ in Thousands	12 Months Ended
	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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The average effective interest rate during the reporting period.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, maximum month-end borrowings during the period.

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