OTHER COMPREHENSIVE INCOME (LOSS) - Tax Effects of Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Before tax amount
Unrealized gains (losses) arising during the period, net of reclassification adjustment	$ (12,893)	$ 158,280	$ (175,197)	$ 293,684
Income tax (expense) benefit
Unrealized gains (losses) arising during the period, net of reclassification adjustment	2,218	(27,614)	38,963	(47,837)
Net of tax amount
Total other comprehensive income (loss), net of tax	(10,675)	130,666	(136,234)	245,847
Available for sale investments
Before tax amount
Adjustment for reclassification of net realized (gains) losses and impairment losses recognized in net income (loss)	9,277	11,006	8,060	45,316
Unrealized gains (losses) arising during the period, net of reclassification adjustment	(8,309)	142,257	(167,552)	277,817
Income tax (expense) benefit
Adjustment for reclassification of net realized (gains) losses and impairment losses recognized in net income (loss)	(1,742)	(1,484)	(1,465)	(7,654)
Unrealized gains (losses) arising during the period, net of reclassification adjustment	2,218	(27,614)	38,963	(47,837)
Net of tax amount
Adjustment for reclassification of net realized (gains) losses and impairment losses recognized in net income (loss)	7,535	9,522	6,595	37,662
Total other comprehensive income (loss), net of tax	(6,091)	114,643	(128,589)	229,980
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	(17,079)	130,559	(173,491)	232,201
Income tax (expense) benefit
Unrealized gains (losses) arising during the period	3,870	(26,013)	40,077	(40,125)
Net of tax amount
Unrealized gains (losses) arising during the period	(13,209)	104,546	(133,414)	192,076
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	(507)	692	(2,121)	300
Income tax (expense) benefit
Unrealized gains (losses) arising during the period	90	(117)	351	(58)
Net of tax amount
Unrealized gains (losses) arising during the period	(417)	575	(1,770)	242
Foreign currency translation adjustment
Before tax amount
Unrealized gains (losses) arising during the period, net of reclassification adjustment	(4,584)	16,023	(7,645)	15,867
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	$ (4,584)	$ 16,023	$ (7,645)	$ 15,867

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