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OTHER COMPREHENSIVE INCOME (LOSS) - Tax Effects of Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Before tax amount
Unrealized gains (losses) arising during the period, net of reclassification adjustment	$ 212,922	$ (455,285)
Foreign currency translation adjustment	(535)	2,775
Total comprehensive income (loss), before tax	212,387	(452,510)
Income tax (expense) benefit
Unrealized gains (losses) arising during the period, net of reclassification adjustment	(23,983)	57,674
Foreign currency translation adjustment	0	0
Total comprehensive income (loss), net of tax	(23,983)	57,674
Net of tax amount
Unrealized gains (losses) arising during the period, net of reclassification adjustment	188,939	(397,611)
Foreign currency translation adjustment	(535)	2,775
Total other comprehensive income (loss), net of tax	188,404	(394,836)
Available for sale investments
Before tax amount
Adjustment for reclassification of net realized (gains) losses and impairment losses recognized in net income (loss)	44,121	52,916
Income tax (expense) benefit
Adjustment for reclassification of net realized (gains) losses and impairment losses recognized in net income (loss)	(3,371)	(7,573)
Net of tax amount
Adjustment for reclassification of net realized (gains) losses and impairment losses recognized in net income (loss)	40,750	45,343
Unrealized gains (losses) arising during the period, net of reclassification adjustment	188,939	(397,611)
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	153,851	(507,969)
Income tax (expense) benefit
Unrealized gains (losses) arising during the period	(19,284)	65,247
Net of tax amount
Unrealized gains (losses) arising during the period	134,567	(442,722)
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	14,950	(232)
Income tax (expense) benefit
Unrealized gains (losses) arising during the period	(1,328)	0
Net of tax amount
Unrealized gains (losses) arising during the period	$ 13,622	$ (232)

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