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Investments (Equity Securities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, at fair value	$ 11,710		$ 11,710		$ 11,590
Investment related gains (losses), net	703	$ (5,016)	415	$ (5,598)
Stock Mutual Funds [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, at fair value	2,727		2,727		2,615
Bond Mutual Funds [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, at fair value	4,348		4,348		4,337
Common stock [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, at fair value	790		790		857
Non-redeemable Preferred Stock [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, at fair value	8		8		8
Nonredeemable Preferred Stock Fund Member [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, at fair value	3,837		3,837		$ 3,773
Equity Securities [Member]
Debt and Equity Securities, FV-NI [Line Items]
Investment related gains (losses), net	$ (200)	$ (1,200)	$ 100	$ (2,000)

X

- 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
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(2))
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
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-Name Accounting Standards Codification
-Section 45
-Paragraph 1
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(a))
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