SUMMARY OF INVESTMENTS - Net Investment Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Schedule of Investments [Line Items]
Other	$ 4,381	$ 3,173	$ 11,415	$ 11,259
Total investment income	28,910	27,300	80,299	67,215
Less investment expenses	2,918	2,841	9,176	8,385
Net investment income	25,992	24,459	71,123	58,830
Interest on fixed maturities
Schedule of Investments [Line Items]
Interest on fixed maturities	21,874	18,719	64,300	49,826
Dividends on equity securities
Schedule of Investments [Line Items]
Dividends on equity securities	0	0	0	341
Income on other long-term investments
Schedule of Investments [Line Items]
Income on other long-term investments	$ 2,655	$ 5,408	$ 4,584	$ 5,789