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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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