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Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Sales    
Total Sales $ 143,791 $ 120,806
Cost of Sales    
Total Cost of Sales 83,179 81,073
Gross Profit 60,612 39,733
Selling, general and administrative expenses 35,132 33,531
Research and development expenses 31,647 32,849
Operating Loss (6,167) (26,647)
Interest and dividend income 591 866
Interest expense (127) (132)
Net investment gain (loss) 5,926 (97)
Other income (expense), net 855 (57)
Gain on bargain purchase of a business, net   11,322
Income (Loss) Before Provision for Income Taxes 1,078 (14,745)
(Provision) benefit for income taxes (308) 3,931
Net Income (Loss) $ 770 $ (10,814)
Weighted average shares outstanding – basic 47,782 48,232
Weighted average shares outstanding – diluted 47,853 48,232
Earnings (loss) per common share – basic $ 0.02 $ (0.22)
Earnings (loss) per common share – diluted 0.02 (0.22)
Dividend per share $ 0.09 $ 0.09
Product [Member]    
Sales    
Total Sales $ 125,822 $ 105,253
Cost of Sales    
Total Cost of Sales 70,734 68,612
Service [Member]    
Sales    
Total Sales 17,969 15,553
Cost of Sales    
Total Cost of Sales $ 12,445 $ 12,461