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Cash and Marketable Securities (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Marketable Securities [Line Items]
Proceeds from sales of securities	$ 0		$ 0	$ 48,000,000
Available for sale securities, maturities	0		0	12,000,000
Available for sale securities, gross realized gains	0		0
Available for sale securities, gross realized losses	$ 0		0
Impairment charges due to other than temporary declines in value of certain investments			$ 0	0
Maximum [Member]
Marketable Securities [Line Items]
Proceeds from sales of securities		$ 1,000,000
Available for sale securities, maturities		1,000,000
Available for sale securities, gross realized gains		1,000,000		1,000,000
Available for sale securities, gross realized losses		$ 1,000,000		$ 1,000,000

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

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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).

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-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
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