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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sales      
Products $ 525,502 $ 527,422 $ 559,532
Services 111,279 72,642 70,475
Total Sales 636,781 600,064 630,007
Cost of Sales      
Products 270,695 293,843 288,015
Services 74,742 39,324 30,665
Total Cost of Sales 345,437 333,167 318,680
Gross Profit 291,344 266,897 311,327
Selling, general and administrative expenses 131,805 123,542 131,958
Research and development expenses 124,804 129,876 132,258
Operating Income 34,735 13,479 47,111
Interest and dividend income 3,918 3,953 5,019
Interest expense (572) (596) (677)
Net realized investment gain 5,923 10,337 7,278
Other income (expense), net (651) (1,465) 1,175
Gain on bargain purchase of a business 3,542    
Income before provision for income taxes 46,895 25,708 59,906
Provision for income taxes (11,666) (7,062) (15,286)
Net Income $ 35,229 $ 18,646 $ 44,620
Weighted average shares outstanding – basic 48,724 51,145 55,120
Weighted average shares outstanding – diluted 48,949 51,267 55,482
Earnings per common share – basic $ 0.72 $ 0.36 $ 0.81
Earnings per common share – diluted $ 0.72 $ 0.36 $ 0.80