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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]        
Unrealized gains on investments, tax $ 2,630 $ 1,164 $ 1,584 $ 2,561