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Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sales        
Total Sales $ 140,335 $ 185,112 $ 389,189 $ 540,064
Cost of Sales        
Total Cost of Sales 81,887 98,621 241,012 295,238
Gross Profit 58,448 86,491 148,177 244,826
Selling, general and administrative expenses 30,750 34,676 96,361 104,171
Research and development expenses 29,877 33,588 93,455 99,116
Operating Income (Loss) (2,179) 18,227 (41,639) 41,539
Interest and dividend income 825 952 2,604 2,857
Interest expense (134) (139) (398) (417)
Net investment gain 4,507 1,009 5,400 2,869
Other income (expense), net 201 (842) (73) (1,427)
Gain on bargain purchase of a business     11,322  
Income (Loss) Before Provision for Income Taxes 3,220 19,207 (22,784) 45,421
(Provision) benefit for income taxes 4,369 (3,309) 11,889 (10,471)
Net Income (Loss) $ 7,589 $ 15,898 $ (10,895) $ 34,950
Weighted average shares outstanding – basic 47,710 47,870 47,927 48,110
Weighted average shares outstanding – diluted 47,834 48,531 47,927 48,618
Earnings (loss) per common share – basic $ 0.16 $ 0.33 $ (0.23) $ 0.73
Earnings (loss) per common share – diluted 0.16 0.33 (0.23) 0.72
Dividend per share $ 0.09 $ 0.09 $ 0.27 $ 0.27
Product [Member]        
Sales        
Total Sales $ 121,043 $ 145,467 $ 341,359 $ 444,607
Cost of Sales        
Total Cost of Sales 69,943 73,534 208,184 229,861
Service [Member]        
Sales        
Total Sales 19,292 39,645 47,830 95,457
Cost of Sales        
Total Cost of Sales $ 11,944 $ 25,087 $ 32,828 $ 65,377