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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]    
Change in net unrealized gains (losses) on investments, income tax $ (152,130) $ 86,469
Reclassification adjustment for investment amounts included in net income, income tax 181 (1,498)
Change in net unrealized gains (losses) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings, income tax 3 1,994
Change in accumulated (loss) gain - derivatives, income tax 129 (362)
Reclassification adjustment for derivative amounts included in net income, income tax $ 24 $ 72