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Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sales        
Products $ 155,543 $ 138,549 $ 299,140 $ 262,432
Services 29,130 24,152 55,812 42,473
Total Sales 184,673 162,701 354,952 304,905
Cost of sales        
Products 79,658 67,844 156,317 131,917
Services 20,383 15,902 40,288 28,239
Total Cost of Sales 100,041 83,746 196,605 160,156
Gross Profit 84,632 78,955 158,347 144,749
Selling, general and administrative expenses 34,683 32,866 69,450 63,651
Research and development expenses 33,501 31,277 65,417 60,765
Operating Income 16,448 14,812 23,480 20,333
Interest and dividend income 972 927 1,905 1,782
Interest expense (137) (142) (278) (287)
Net realized investment gain 1,390 1,110 1,860 2,838
Other expense, net (804) (251) (753) (132)
Income before provision for income taxes 17,869 16,456 26,214 24,534
Provision for income taxes (5,468) (6,228) (7,162) (9,292)
Net Income $ 12,401 $ 10,228 $ 19,052 $ 15,242
Weighted average shares outstanding – basic 48,036 48,831 48,232 49,026
Weighted average shares outstanding – diluted 48,413 49,048 48,675 49,218
Earnings per common share – basic $ 0.26 $ 0.21 $ 0.40 $ 0.31
Earnings per common share – diluted 0.26 0.21 0.39 0.31
Dividend per share $ 0.09 $ 0.09 $ 0.18 $ 0.18