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Consolidated Statements of Income (Loss) - USD ($)
shares in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Sales      
Total Sales $ 530,061,000 $ 529,277,000 $ 666,900,000
Cost of Sales      
Total Cost of Sales 310,894,000 325,712,000 363,265,000
Gross Profit 219,167,000 203,565,000 303,635,000
Selling, general and administrative expenses 130,288,000 124,440,000 135,583,000
Research and development expenses 126,200,000 124,547,000 130,666,000
Asset impairments 3,872,000 0 0
Gain on contingency (1,230,000)    
Operating Income (Loss) (39,963,000) (45,422,000) 37,386,000
Interest and dividend income 2,765,000 4,026,000 4,380,000
Interest expense (511,000) (533,000) (556,000)
Net investment gain (loss) 11,434,000 (4,050,000) 4,685,000
Other income (expense), net 1,498,000 1,286,000 (1,208,000)
Gain on bargain purchase of a business   11,322,000  
Income (Loss) Before Income Taxes (24,777,000) (33,371,000) 44,687,000
Income tax (expense) benefit (28,205,000) 14,029,000 (20,847,000)
Net Income (Loss) $ (52,982,000) $ (19,342,000) $ 23,840,000
Weighted average shares outstanding – basic 47,836 47,880 48,153
Weighted average shares outstanding – diluted 47,836 47,880 48,699
Earnings (loss) per common share – basic $ (1.11) $ (0.40) $ 0.50
Earnings (loss) per common share – diluted $ (1.11) $ (0.40) $ 0.49
Network Solutions [Member]      
Sales      
Total Sales $ 455,226,000 $ 458,232,000 $ 540,396,000
Cost of Sales      
Total Cost of Sales 263,677,000 278,929,000 279,563,000
Gross Profit 191,549,000 179,303,000 260,833,000
Services & Support [Member]      
Sales      
Total Sales 74,835,000 71,045,000 126,504,000
Cost of Sales      
Total Cost of Sales 47,217,000 46,783,000 83,702,000
Gross Profit $ 27,618,000 $ 24,262,000 $ 42,802,000