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OTHER COMPREHENSIVE INCOME (LOSS) - Summary of Tax Effects Allocated to Each Component of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Before tax amount      
Unrealized gains (losses) arising during the year, net of reclassification adjustment $ 448,477 $ (909,150) $ (405,378)
Foreign currency translation adjustment (1,572) (10,986) 621
Total other comprehensive income (loss), net of tax 446,905 (920,136) (404,757)
Income tax (expense) benefit      
Unrealized gains (losses) arising during the year, net of reclassification adjustment (52,441) 103,300 46,898
Foreign currency translation adjustment 0 0 0
Total other comprehensive income (loss), net of tax (52,441) 103,300 46,898
Net of tax amount      
Unrealized gains (losses) arising during the year, net of reclassification adjustment 396,036 (805,850) (358,480)
Foreign currency translation adjustment (1,572) (10,986) 621
Total other comprehensive income (loss), net of tax 394,464 (816,836) (357,859)
Available for sale investments      
Before tax amount      
Adjustment for reclassification of net realized (gains) losses and impairment losses recognized in net income (loss) 142,324 335,294 (94,749)
Income tax (expense) benefit      
Adjustment for reclassification of net realized (gains) losses and impairment losses recognized in net income (loss) (13,811) (30,369) 7,635
Net of tax amount      
Adjustment for reclassification of net realized (gains) losses and impairment losses recognized in net income (loss) 128,513 304,925 (87,114)
Unrealized gains (losses) arising during the year, net of reclassification adjustment 396,036 (805,850) (358,480)
Available for sale investments | Unrealized gains (losses) arising during the year for which an allowance for expected credit losses has not been recognized      
Before tax amount      
Unrealized gains (losses) arising during the period 294,933 (1,171,381) (310,710)
Income tax (expense) benefit      
Unrealized gains (losses) arising during the period (36,993) 127,756 39,263
Net of tax amount      
Unrealized gains (losses) arising during the period 257,940 (1,043,625) (271,447)
Available for sale investments | Unrealized gains (losses) arising during the year for which an allowance for expected credit losses has been recognized      
Before tax amount      
Unrealized gains (losses) arising during the period 11,220 (73,063) 81
Income tax (expense) benefit      
Unrealized gains (losses) arising during the period (1,637) 5,913 0
Net of tax amount      
Unrealized gains (losses) arising during the period $ 9,583 $ (67,150) $ 81