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Consolidated Statements of Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sales        
Total Sales $ 128,048 $ 184,673 $ 248,854 $ 354,952
Cost of Sales        
Total Cost of Sales 78,052 100,047 159,125 196,617
Gross Profit 49,996 84,626 89,729 158,335
Selling, general and administrative expenses 32,080 34,706 65,611 69,495
Research and development expenses 30,729 33,557 63,578 65,528
Operating Income (Loss) (12,813) 16,363 (39,460) 23,312
Interest and dividend income 913 972 1,779 1,905
Interest expense (132) (137) (264) (278)
Net realized investment gain 990 1,390 893 1,860
Other expense, net (217) (719) (274) (585)
Gain on bargain purchase of a business     11,322  
Income (Loss) Before Provision for Income Taxes (11,259) 17,869 (26,004) 26,214
(Provision) benefit for income taxes 3,589 (5,468) 7,520 (7,162)
Net Income (Loss) $ (7,670) $ 12,401 $ (18,484) $ 19,052
Weighted average shares outstanding – basic 47,856 48,036 48,043 48,232
Weighted average shares outstanding – diluted 47,902 48,413 48,091 48,675
Earnings (loss) per common share – basic $ (0.16) $ 0.26 $ (0.38) $ 0.40
Earnings (loss) per common share – diluted (0.16) 0.26 (0.38) 0.39
Dividend per share $ 0.09 $ 0.09 $ 0.18 $ 0.18
Product [Member]        
Sales        
Total Sales $ 115,063 $ 155,543 $ 220,316 $ 299,140
Cost of Sales        
Total Cost of Sales 69,629 79,663 138,241 156,327
Service [Member]        
Sales        
Total Sales 12,985 29,130 28,538 55,812
Cost of Sales        
Total Cost of Sales $ 8,423 $ 20,384 $ 20,884 $ 40,290