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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net income (loss) $ 188,098 $ (9,384) $ 518,870 $ 174,592
Other comprehensive income (loss), net of tax:        
Unrealized gains (losses) arising during the period, net of reclassification adjustment (137,980) (305,785) (10,837) (1,083,017)
Foreign currency translation adjustment (6,950) (12,751) (4,302) (16,169)
Total other comprehensive income (loss), net of tax (144,930) (318,536) (15,139) (1,099,186)
Comprehensive income (loss) 43,168 (327,920) 503,731 (924,594)
Unrealized gains (losses) on available for sale investments        
Other comprehensive income (loss), net of tax:        
Adjustment for reclassification of net realized (gains) losses and impairment losses recognized in net income (loss) 23,018 98,779 100,388 229,773
Unrealized gains (losses) arising during the period, net of reclassification adjustment (137,980) (305,785) (10,837) (1,083,017)
Unrealized gains (losses) on available for sale investments | Unrealized gains (losses) arising during the period for which an allowance for expected credit losses has not been recognized        
Other comprehensive income (loss), net of tax:        
Unrealized gains (losses) arising during period (156,051) (393,880) (109,595) (1,259,482)
Unrealized gains (losses) on available for sale investments | Unrealized gains (losses) arising during the period for which an allowance for expected credit losses has been recognized        
Other comprehensive income (loss), net of tax:        
Unrealized gains (losses) arising during period $ (4,947) $ (10,684) $ (1,630) $ (53,308)