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INVESTMENTS - Equity Securities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]
Cost	$ 545,538	$ 543,833
Gross unrealized gains	102,247	110,296
Gross unrealized losses	(65,607)	(65,618)
Fair value	582,178	588,511
Common stocks
Debt and Equity Securities, FV-NI [Line Items]
Cost	2,843	2,843
Gross unrealized gains	25	101
Gross unrealized losses	(416)	(398)
Fair value	2,452	2,546
Preferred stocks
Debt and Equity Securities, FV-NI [Line Items]
Cost	5,654	5,496
Gross unrealized gains	161	218
Gross unrealized losses	(113)	(113)
Fair value	5,702	5,601
Exchange-traded funds
Debt and Equity Securities, FV-NI [Line Items]
Cost	188,548	182,989
Gross unrealized gains	99,734	105,858
Gross unrealized losses	(1,116)	(1,572)
Fair value	287,166	287,275
Bond mutual funds
Debt and Equity Securities, FV-NI [Line Items]
Cost	348,493	352,505
Gross unrealized gains	2,327	4,119
Gross unrealized losses	(63,962)	(63,535)
Fair value	$ 286,858	$ 293,089

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
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
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-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483467/210-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482736/825-10-45-1A

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Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1))
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Amount of unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
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