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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Net income $ 138,284 $ 74,112
Other comprehensive income (loss):    
Change in net unrealized gains (losses) on investments, net of income tax: (2019 - $302,063; 2018 - $(153,379)) 1,136,331 (577,712)
Reclassification adjustment for investment amounts included in net income, net of income tax: (2019 - $(415); 2018 - $181) (1,560) 681
Change in net unrealized gains (losses) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings, net of income tax: (2019 - $2,337; 2018 - $3) 8,792 11
Change in accumulated (loss) gain - derivatives, net of income tax: (2019 - $(522) ; 2018 - $129) (1,966)  
Change in accumulated (loss) gain - derivatives, net of income tax: (2019 - $(522) ; 2018 - $129)   487
Reclassification adjustment for derivative amounts included in net income, net of income tax: (2019 - $58 ; 2018 - $24) (220)  
Reclassification adjustment for derivative amounts included in net income, net of income tax: (2019 - $58 ; 2018 - $24)   89
Change in postretirement benefits liability adjustment, net of income tax: (2019 - $0; 2018 - $0) 0 0
Total other comprehensive income (loss) 1,141,817 (576,444)
Total comprehensive income (loss) $ 1,280,101 $ (502,332)