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Investments in Securities and Fair Value Investments in Securities (Schedule of Carrying Value and Fair Value of Financial Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financial Assets |  |
Cash | $ 35,311 | $ 37,168
Accrued interest and dividends | 872 | 817
Common stocks | 51,691 | 76,853
Money market funds and US treasury bills | 103,649 | 45,930
Equity investments in unconsolidated affiliates, measurement alternative | 8,915 | 8,688
Assets, Fair Value Disclosure | 200,438 | 169,456
Level 1 |  |
Financial Assets |  |
Cash | 35,311 | 37,168
Accrued interest and dividends | 872 | 817
Common stocks | 51,691 | 76,853
Money market funds and US treasury bills | 103,649 | 45,930
Equity investments in unconsolidated affiliates, measurement alternative | 0 | 0
Assets, Fair Value Disclosure | 191,523 | 160,768
Level 2 |  |
Financial Assets |  |
Cash | 0 | 0
Accrued interest and dividends | 0 | 0
Common stocks | 0 | 0
Money market funds and US treasury bills | 0 | 0
Equity investments in unconsolidated affiliates, measurement alternative | 0 | 0
Assets, Fair Value Disclosure | 0 | 0
Level 3 |  |
Financial Assets |  |
Cash | 0 | 0
Accrued interest and dividends | 0 | 0
Common stocks | 0 | 0
Money market funds and US treasury bills | 0 | 0
Equity investments in unconsolidated affiliates, measurement alternative | 8,915 | 8,688
Assets, Fair Value Disclosure | $ 8,915 | $ 8,688

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Fair value portion 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. + References No definition available. + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740 + Details
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- Definition Fair value portion of investments in an entity not consolidated. Includes, but is not limited to, investments in an entity that is affiliated with the reporting entity by means of direct or indirect ownership, an entity in which the reporting entity shares control of the entity with another party or group, an entity which the company has significant influence, but does not have control and subsidiaries that are not required to be consolidated and are accounted for using the equity or cost method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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