Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Statements of Comprehensive Income

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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]        
Net income $ 19,087 $ 14,785 $ 21,206 $ 14,684
Unrealized gains (losses) on investments, net of tax (1,037) 75 (5,976) 188
Comprehensive income $ 18,050 $ 14,860 $ 15,230 $ 14,872