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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Statement of Comprehensive Income [Abstract]    
Change in net unrealized gains (losses) on investments, income tax $ 86,469 $ 235,285
Reclassification adjustment for investment amounts included in net income, income tax (1,498) (1,022)
Change in net unrealized gains (losses) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings, income tax 1,994 159
Change in accumulated (loss) gain - derivatives, income tax (362) 0
Reclassification adjustment for derivative amounts included in net income, income tax $ 72 $ 0