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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sales      
Products $ 540,396 $ 525,502 $ 527,422
Services 126,504 111,279 72,642
Total Sales 666,900 636,781 600,064
Cost of Sales      
Products 279,541 270,695 293,843
Services 83,699 74,742 39,324
Total Cost of Sales 363,240 345,437 333,167
Gross Profit 303,660 291,344 266,897
Selling, general and administrative expenses 135,489 131,805 123,542
Research and development expenses 130,434 124,804 129,876
Operating Income 37,737 34,735 13,479
Interest and dividend income 4,380 3,918 3,953
Interest expense (556) (572) (596)
Net realized investment gain 4,685 5,923 10,337
Other expense, net (1,559) (651) (1,465)
Gain on bargain purchase of a business   3,542  
Income before provision for income taxes 44,687 46,895 25,708
Provision for income taxes (20,847) (11,666) (7,062)
Net Income $ 23,840 $ 35,229 $ 18,646
Weighted average shares outstanding – basic 48,153 48,724 51,145
Weighted average shares outstanding – diluted 48,699 48,949 51,267
Earnings per common share – basic $ 0.50 $ 0.72 $ 0.36
Earnings per common share – diluted $ 0.49 $ 0.72 $ 0.36