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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income (loss) $ (19,342) $ 23,840 $ 35,229
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 15,891 15,692 14,407
Amortization of net premium (discount) on available-for-sale investments (50) 425 643
Net (gain) loss on long-term investments 4,050 (4,685) (5,923)
Net (gain) loss on disposal of property, plant and equipment 67 (145) 22
Gain on bargain purchase of a business (11,322)   (3,542)
Stock-based compensation expense 7,155 7,433 6,695
Deferred income taxes (17,257) 14,073 (2,685)
Change in operating assets and liabilities:      
Accounts receivable, net 49,200 (49,103) (21,302)
Other receivables (8,522) (10,222) 4,101
Inventory 24,192 (15,518) (10,887)
Prepaid expenses and other assets 10,727 (4,830) (7,108)
Accounts payable (3,799) (17,742) 26,722
Accrued expenses and other liabilities (3,226) (5,455) 8,792
Income taxes payable 7,690 3,858 (3,162)
Net cash provided by (used in) operating activities 55,454 (42,379) 42,002
Cash flows from investing activities:      
Purchases of property, plant and equipment (8,110) (14,720) (21,441)
Proceeds from disposals of property, plant and equipment   151  
Proceeds from sales and maturities of available-for-sale investments 153,649 173,752 225,075
Purchases of available-for-sale investments (123,209) (93,141) (209,172)
Acquisition of business, net of cash acquired (22,045)   (943)
Net cash provided by (used in) investing activities 285 66,042 (6,481)
Cash flows from financing activities:      
Proceeds from stock option exercises 1,483 13,412 4,717
Purchases of treasury stock (15,532) (17,348) (25,817)
Dividend payments (17,267) (17,368) (17,583)
Payments on long-term debt (1,100) (1,100) (1,100)
Net cash used in financing activities (32,416) (22,404) (39,783)
Net increase (decrease) in cash and cash equivalents 23,323 1,259 (4,262)
Effect of exchange rate changes (4,252) 5,279 (393)
Cash and cash equivalents, beginning of year 86,433 79,895 84,550
Cash and cash equivalents, end of year 105,504 86,433 79,895
Supplemental disclosure of cash flow information      
Cash paid during the year for interest 534 555 575
Cash paid during the year for income taxes 4,104 2,988 18,689
Supplemental disclosure of non-cash investing activities      
Purchases of property, plant and equipment included in accounts payable 62 $ 408 $ 2,103
Contingent payments $ 1,230