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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 $ 3,953 $ 3,112 $ 13,047 $ 11,861
Other comprehensive income (loss), net of taxes:        
Foreign currency translation 1,601 (120) 4,905 (68)
Net change in market value of investments 23 (48) 47 72
Other comprehensive income (loss) 1,624 (168) 4,952 4
Comprehensive income $ 5,577 $ 2,944 $ 17,999 $ 11,865