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INVESTMENTS - Equity Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | $ 538,378 | $ 520,743
Gross unrealized gains | 86,375 | 127,218
Gross unrealized losses | (50,374) | (68,687)
Fair value | 574,379 | 579,274
Common stocks |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 3,061 | 3,061
Gross unrealized gains | 64 | 65
Gross unrealized losses | (509) | (488)
Fair value | 2,616 | 2,638
Preferred stocks |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 5,843 | 5,843
Gross unrealized gains | 157 | 136
Gross unrealized losses | (112) | (112)
Fair value | 5,888 | 5,867
Exchange-traded funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 235,124 | 188,771
Gross unrealized gains | 83,685 | 126,477
Gross unrealized losses | (4,301) | (1,206)
Fair value | 314,508 | 314,042
Bond mutual funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 294,350 | 323,068
Gross unrealized gains | 2,469 | 540
Gross unrealized losses | (45,452) | (66,881)
Fair value | $ 251,367 | $ 256,727

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