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Investments (Schedule of Cash Equivalents) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash And Cash Equivalents [Line Items]
Cash equivalents	$ 40,437	$ 76,110	$ 178,674
Cost [Member]
Cash And Cash Equivalents [Line Items]
Cash equivalents	6,954	70,485
Cost [Member] | Institutional Money Market Funds [Member]
Cash And Cash Equivalents [Line Items]
Cash equivalents	6,954	70,485
Estimated Fair Value [Member]
Cash And Cash Equivalents [Line Items]
Cash equivalents	6,954	70,485
Estimated Fair Value [Member] | Institutional Money Market Funds [Member]
Cash And Cash Equivalents [Line Items]
Cash equivalents	$ 6,954	$ 70,485

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 10
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-Section 45
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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-Publisher FASB
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+ References

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