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OTHER COMPREHENSIVE INCOME (LOSS) (Tax Effects of Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Before tax amount    
Total comprehensive income (loss) $ (225,646) $ (282,482)
Income tax (expense) benefit    
Total comprehensive income (loss) 26,112 20,853
Net of tax amount    
Total comprehensive income (loss) (199,534) (261,629)
Available for sale investments:    
Before tax amount    
Adjustment for reclassification of net realized (gains) losses and impairment losses recognized in net income (loss) (30,876) 4,126
Total comprehensive income (loss) (226,895) (274,757)
Income tax (expense) benefit    
Adjustment for reclassification of net realized (gains) losses and impairment losses recognized in net income (loss) 1,877 1,522
Total comprehensive income (loss) 26,112 20,853
Net of tax amount    
Adjustment for reclassification of net realized (gains) losses and impairment losses recognized in net income (loss) (28,999) 5,648
Total comprehensive income (loss) (200,783) (253,904)
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 (196,066) (260,758)
Income tax (expense) benefit    
Unrealized gains (losses) arising during the period 24,235 17,796
Net of tax amount    
Unrealized gains (losses) arising during the period (171,831) (242,962)
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 47 (18,125)
Income tax (expense) benefit    
Unrealized gains (losses) arising during the period 0 1,535
Net of tax amount    
Unrealized gains (losses) arising during the period 47 (16,590)
Foreign currency translation adjustment    
Before tax amount    
Total comprehensive income (loss) 1,249 (7,725)
Income tax (expense) benefit    
Total comprehensive income (loss) 0 0
Net of tax amount    
Total comprehensive income (loss) $ 1,249 $ (7,725)