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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Change in net unrealized gains (losses) on investments, income tax $ (375,256) $ 332,593 $ 324,195
Reclassification adjustment for investment amounts included in net income, income tax 4,174 (397) (5,085)
Change in net unrealized gains (losses) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings, income tax (5,517) 762 (1,081)
Change in accumulated (loss) gain - derivatives, income tax (501) (303) 370
Reclassification adjustment for derivative amounts included in net income, income tax $ 301 $ 243 $ 21