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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Change in net unrealized gains (losses) on investments, income tax $ 302,063 $ (153,379)
Reclassification adjustment for investment amounts included in net income, income tax (415) 181
Change in net unrealized gains (losses) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings, income tax 2,337 3
Change in accumulated (loss) gain - derivatives, income tax (522)  
Change in accumulated (loss) gain - derivatives, income tax   129
Reclassification adjustment for derivative amounts included in net income, income tax 58  
Reclassification adjustment for derivative amounts included in net income, income tax   24
Change in postretirement benefits liability adjustment, income tax $ 0 $ 0