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Cash and Marketable Securities (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Marketable Securities [Line Items]
Proceeds from sales of securities	$ 0	$ 48,000,000
Available for sale securities, maturities	0	12,000,000
Available for sale securities, gross realized gains	0	1,000,000
Available for sale securities, gross realized losses	0	1,000,000
Impairment charges due to other than temporary declines in value of certain investments	$ 0	$ 0

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- Definition

Impairment charges due to other than temporary declines in certain investments.

+ References

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
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Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-URI https://asc.fasb.org/1943274/2147481830/320-10-45-11

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Section 45
-Paragraph 11
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-URI https://asc.fasb.org/1943274/2147481830/320-10-45-11

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