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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]        
Net income $ 14,785 $ 10,233 $ 14,684 $ 10,752
Unrealized gains on investments, net of tax 75 4 188 58
Comprehensive income $ 14,860 $ 10,237 $ 14,872 $ 10,810