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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Net income $ 302,361 $ 1,106,532 $ 393,029
Other comprehensive income (loss):      
Change in net unrealized gains (losses) on investments, net of income tax: (2018 - $(377,412); 2017 - $332,896; 2016 - $324,267) (1,420,499) 707,298 602,211
Reclassification adjustment for investment amounts included in net income, net of income tax: (2018 - $4,161; 2017 - $489; 2016 - $(5,094)) 15,651 642 (9,460)
Change in net unrealized (losses) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings, net of income tax: (2018 - $(5,516); 2017 - $761; 2016 - $(1,081)) (20,751) 391 (2,008)
Change in accumulated (loss) gain—derivatives, net of income tax: (2018 - $(501); 2017 - $(303); 2016 - $370) (1,884) (563) 688
Reclassification adjustment for derivative amounts included in net income, net of income tax: (2018 - $301; 2017 - $243; 2016 - $21) 1,130 451 39
Change in postretirement benefits liability adjustment, net of income tax: (2018 - $(414); 2017 - $(4,047); 2016 - $(2,616)) (1,557) (15,225) (4,859)
Total other comprehensive income (loss) (1,427,910) 692,994 586,611
Total comprehensive income (loss) $ (1,125,549) $ 1,799,526 $ 979,640