INVESTMENTS - Equity Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]
Cost	$ 520,743	$ 543,833
Gross unrealized gains	127,218	110,296
Gross unrealized losses	(68,687)	(65,618)
Fair value	579,274	588,511
Common stocks
Debt and Equity Securities, FV-NI [Line Items]
Cost	3,061	2,843
Gross unrealized gains	65	101
Gross unrealized losses	(488)	(398)
Fair value	2,638	2,546
Preferred stocks
Debt and Equity Securities, FV-NI [Line Items]
Cost	5,843	5,496
Gross unrealized gains	136	218
Gross unrealized losses	(112)	(113)
Fair value	5,867	5,601
Exchange-traded funds
Debt and Equity Securities, FV-NI [Line Items]
Cost	188,771	182,989
Gross unrealized gains	126,477	105,858
Gross unrealized losses	(1,206)	(1,572)
Fair value	314,042	287,275
Bond mutual funds
Debt and Equity Securities, FV-NI [Line Items]
Cost	323,068	352,505
Gross unrealized gains	540	4,119
Gross unrealized losses	(66,881)	(63,535)
Fair value	$ 256,727	$ 293,089