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INVESTMENTS - Equity Securities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]
Cost	$ 559,293	$ 494,356
Gross unrealized gains	83,894	68,694
Gross unrealized losses	(69,271)	(77,797)
Fair value	$ 573,916	485,253
Limited partnership
Debt and Equity Securities, FV-NI [Line Items]
Percentage of investment composition (as a percent)	71.00%
Common stocks
Debt and Equity Securities, FV-NI [Line Items]
Cost	$ 3,130	7,279
Gross unrealized gains	321	636
Gross unrealized losses	(437)	(442)
Fair value	3,014	7,473
Preferred stocks
Debt and Equity Securities, FV-NI [Line Items]
Cost	115	115
Gross unrealized gains	0	0
Gross unrealized losses	(113)	(43)
Fair value	2	72
Exchange-traded funds
Debt and Equity Securities, FV-NI [Line Items]
Cost	199,212	207,505
Gross unrealized gains	83,523	68,058
Gross unrealized losses	(3,016)	(5,757)
Fair value	279,719	269,806
Bond mutual funds
Debt and Equity Securities, FV-NI [Line Items]
Cost	356,836	279,457
Gross unrealized gains	50	0
Gross unrealized losses	(65,705)	(71,555)
Fair value	$ 291,181	$ 207,902

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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