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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:      
Net Income (Loss) $ 2,378,000 $ (52,982,000) $ (19,342,000)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:      
Depreciation and amortization 16,627,000 17,771,000 15,891,000
Asset impairments 65,000 3,872,000 0
(Gain) loss on investments (5,802,000) (11,434,000) 4,050,000
Stock-based compensation expense 6,834,000 6,962,000 7,155,000
Deferred income taxes (1,356,000) 30,070,000 (17,257,000)
Gain on contingency payment   (1,230,000)  
Gain on life insurance proceeds   (1,000,000)  
Gain on bargain purchase of a business     (11,322,000)
Other 216,000 (33,000) 17,000
Change in operating assets and liabilities:      
Accounts receivable, net (7,269,000) 8,282,000 49,200,000
Other receivables (4,732,000) 20,046,000 (8,522,000)
Inventory, net (25,582,000) 1,252,000 24,192,000
Prepaid expenses and other assets (5,239,000) 2,749,000 10,727,000
Accounts payable, net 4,543,000 (13,494,000) (3,799,000)
Accrued expenses and other liabilities 5,093,000 (4,598,000) (3,226,000)
Income taxes payable (2,294,000) (8,705,000) 7,690,000
Net cash provided by (used in) operating activities (16,518,000) (2,472,000) 55,454,000
Cash flows from investing activities:      
Purchases of property, plant and equipment (6,413,000) (9,494,000) (8,110,000)
Proceeds from disposals of property, plant and equipment 2,000    
Proceeds from sales and maturities of available-for-sale investments 105,100,000 47,268,000 153,649,000
Purchases of available-for-sale investments (56,767,000) (48,578,000) (123,209,000)
Acquisition of note receivable (523,000)    
Life insurance proceeds received   1,000,000  
Acquisition of business   13,000 (22,045,000)
Net cash provided by (used in) investing activities 41,399,000 (9,791,000) 285,000
Cash flows from financing activities:      
Dividend payments (17,334,000) (17,212,000) (17,267,000)
Repayment of bonds payable (24,600,000)    
Tax withholdings related to stock-based compensation settlements (1,043,000)    
Proceeds from stock option exercises   526,000 1,483,000
Purchases of treasury stock   (184,000) (15,532,000)
Payments on long-term debt   (1,000,000) (1,100,000)
Net cash used in financing activities (42,977,000) (17,870,000) (32,416,000)
Net increase (decrease) in cash and cash equivalents (18,096,000) (30,133,000) 23,323,000
Effect of exchange rate changes 4,502,000 (1,598,000) (4,252,000)
Cash, cash equivalents and restricted cash, beginning of year 73,773,000 105,504,000 86,433,000
Cash, cash equivalents and restricted cash, end of year 60,179,000 73,773,000 105,504,000
Supplemental disclosure of cash flow information      
Cash paid during the year for interest 24,000 512,000 534,000
Cash paid during the year for income taxes 7,609,000 9,357,000 4,104,000
Supplemental disclosure of non-cash investing activities      
Purchases of property, plant and equipment included in accounts payable $ 108,000 $ 90,000 62,000
Contingent payment     $ 1,230,000