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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:      
Net income (loss) $ (52,982,000) $ (19,342,000) $ 23,840,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 17,771,000 15,891,000 15,692,000
Asset impairments 3,872,000 0 0
Amortization of net premium (discount) on available-for-sale investments (100,000) (50,000) 425,000
Net (gain) loss on long-term investments (11,434,000) 4,050,000 (4,685,000)
Net (gain) loss on disposal of property, plant and equipment 67,000 67,000 (145,000)
Gain on bargain purchase of a business   (11,322,000)  
Gain on contingency payment (1,230,000)    
Gain on life insurance proceeds (1,000,000)    
Stock-based compensation expense 6,962,000 7,155,000 7,433,000
Deferred income taxes 30,070,000 (17,257,000) 14,073,000
Change in operating assets and liabilities:      
Accounts receivable, net 8,282,000 49,200,000 (49,103,000)
Other receivables 20,046,000 (8,522,000) (10,222,000)
Inventory, net 1,252,000 24,192,000 (15,518,000)
Prepaid expenses and other assets 2,749,000 10,727,000 (4,830,000)
Accounts payable, net (13,494,000) (3,799,000) (17,742,000)
Accrued expenses and other liabilities (4,598,000) (3,226,000) (5,455,000)
Income taxes payable (8,705,000) 7,690,000 3,858,000
Net cash provided by (used in) operating activities (2,472,000) 55,454,000 (42,379,000)
Cash flows from investing activities:      
Purchases of property, plant and equipment (9,494,000) (8,110,000) (14,720,000)
Proceeds from disposals of property, plant and equipment     151,000
Proceeds from sales and maturities of available-for-sale investments 47,268,000 153,649,000 173,752,000
Purchases of available-for-sale investments (48,578,000) (123,209,000) (93,141,000)
Life insurance proceeds received 1,000,000    
Acquisition of business, net of cash acquired 13,000 (22,045,000)  
Net cash provided by (used in) investing activities (9,791,000) 285,000 66,042,000
Cash flows from financing activities:      
Proceeds from stock option exercises 526,000 1,483,000 13,412,000
Purchases of treasury stock (184,000) (15,532,000) (17,348,000)
Dividend payments (17,212,000) (17,267,000) (17,368,000)
Payments on long-term debt (1,000,000) (1,100,000) (1,100,000)
Net cash used in financing activities (17,870,000) (32,416,000) (22,404,000)
Net increase (decrease) in cash and cash equivalents (30,133,000) 23,323,000 1,259,000
Effect of exchange rate changes (1,598,000) (4,252,000) 5,279,000
Cash and cash equivalents, beginning of year 105,504,000 86,433,000 79,895,000
Cash and cash equivalents, end of year 73,773,000 105,504,000 86,433,000
Supplemental disclosure of cash flow information      
Cash paid during the year for interest 512,000 534,000 555,000
Cash paid during the year for income taxes 9,357,000 4,104,000 2,988,000
Supplemental disclosure of non-cash investing activities      
Purchases of property, plant and equipment included in accounts payable $ 90,000 62,000 $ 408,000
Contingent payment   $ 1,230,000