INVESTMENTS - Equity Securities (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2025	Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items]
Cost	$ 529,074	$ 520,743
Gross unrealized gains	118,412	127,218
Gross unrealized losses	(28,211)	(68,687)
Fair value	619,275	579,274
Common stocks
Debt and Equity Securities, FV-NI [Line Items]
Cost	3,129	3,061
Gross unrealized gains	99	65
Gross unrealized losses	(518)	(488)
Fair value	2,710	2,638
Preferred stocks
Debt and Equity Securities, FV-NI [Line Items]
Cost	11,832	5,843
Gross unrealized gains	356	136
Gross unrealized losses	(124)	(112)
Fair value	12,064	5,867
Exchange-traded funds
Debt and Equity Securities, FV-NI [Line Items]
Cost	229,523	188,771
Gross unrealized gains	108,452	126,477
Gross unrealized losses	(266)	(1,206)
Fair value	337,709	314,042
Bond mutual funds
Debt and Equity Securities, FV-NI [Line Items]
Cost	284,590	323,068
Gross unrealized gains	9,505	540
Gross unrealized losses	(27,303)	(66,881)
Fair value	$ 266,792	$ 256,727