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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement of Comprehensive Income [Abstract]    
Net income (loss) $ 123,300 $ (177,827)
Other comprehensive income (loss), net of tax:    
Unrealized gains (losses) arising during the period, net of reclassification adjustment (200,783) (253,904)
Foreign currency translation adjustment 1,249 (7,725)
Total other comprehensive income (loss), net of tax (199,534) (261,629)
Comprehensive income (loss) (76,234) (439,456)
Unrealized gains (losses) on available for sale investments, net of tax:    
Other comprehensive income (loss), net of tax:    
Adjustment for reclassification of net realized (gains) losses and impairment losses recognized in net income (loss) (28,999) 5,648
Unrealized gains (losses) arising during the period, net of reclassification adjustment (200,783) (253,904)
Unrealized gains (losses) on available for sale investments, net of tax: | 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 holding gain (loss) arising during period (171,831) (242,962)
Unrealized gains (losses) on available for sale investments, net of tax: | 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 holding gain (loss) arising during period $ 47 $ (16,590)