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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME(UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Statement of Comprehensive Income [Abstract]    
Net income $ 395,459 $ 180,097
Other comprehensive income (loss), net of tax:    
Unrealized gains (losses) arising during the period, net of reclassification adjustment (37,062) 188,939
Foreign currency translation adjustment (8,951) (535)
Total other comprehensive income (loss), net of tax (46,013) 188,404
Comprehensive income 349,446 368,501
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) 23,415 40,750
Unrealized gains (losses) arising during the period, net of reclassification adjustment (37,062) 188,939
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 (60,059) 134,567
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 $ (418) $ 13,622