OTHER COMPREHENSIVE INCOME (LOSS) - Tax Effects of Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Before tax amount
Unrealized gains (losses) arising during the period, net of reclassification adjustment	$ 158,280	$ 19,429	$ 293,684	$ (41,485)
Income tax (expense) benefit
Unrealized gains (losses) arising during the period, net of reclassification adjustment	(27,614)	(2,548)	(47,837)	12,353
Net of tax amount
Total other comprehensive income (loss), net of tax	130,666	16,881	245,847	(29,132)
Available for sale investments
Before tax amount
Adjustment for reclassification of net realized (gains) losses and impairment losses recognized in net income (loss)	11,006	59,496	45,316	84,375
Unrealized gains (losses) arising during the period, net of reclassification adjustment	142,257	21,232	277,817	(30,731)
Income tax (expense) benefit
Adjustment for reclassification of net realized (gains) losses and impairment losses recognized in net income (loss)	(1,484)	(5,124)	(7,654)	(6,588)
Unrealized gains (losses) arising during the period, net of reclassification adjustment	(27,614)	(2,548)	(47,837)	12,353
Net of tax amount
Adjustment for reclassification of net realized (gains) losses and impairment losses recognized in net income (loss)	9,522	54,372	37,662	77,787
Total other comprehensive income (loss), net of tax	114,643	18,684	229,980	(18,378)
Available for sale investments \| Unrealized gains (losses) arising during the period for which an allowance for expected credit losses has not been recognized
Before tax amount
Unrealized gains (losses) arising during the period	130,559	(38,138)	232,201	(114,506)
Income tax (expense) benefit
Unrealized gains (losses) arising during the period	(26,013)	2,552	(40,125)	18,904
Net of tax amount
Unrealized gains (losses) arising during the period	104,546	(35,586)	192,076	(95,602)
Available for sale investments \| Unrealized gains (losses) arising during the period for which an allowance for expected credit losses has been recognized
Before tax amount
Unrealized gains (losses) arising during the period	692	(126)	300	(600)
Income tax (expense) benefit
Unrealized gains (losses) arising during the period	(117)	24	(58)	37
Net of tax amount
Unrealized gains (losses) arising during the period	575	(102)	242	(563)
Foreign currency translation adjustment
Before tax amount
Unrealized gains (losses) arising during the period, net of reclassification adjustment	16,023	(1,803)	15,867	(10,754)
Income tax (expense) benefit
Unrealized gains (losses) arising during the period, net of reclassification adjustment	0	0	0	0
Net of tax amount
Total other comprehensive income (loss), net of tax	$ 16,023	$ (1,803)	$ 15,867	$ (10,754)

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