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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net Income (Loss) $ (10,814) $ 6,651
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 3,614 4,323
Amortization of net premium on available-for-sale investments 42 124
Net realized (gain) loss on long-term investments 97 (470)
Net (gain) loss on disposal of property, plant and equipment 67 (16)
Gain on bargain purchase of a business (11,322)  
Stock-based compensation expense 1,819 1,883
Deferred income taxes (1,877) (1,947)
Changes in operating assets and liabilities:    
Accounts receivable, net 63,904 7,247
Other receivables (6,598) 1,884
Inventory 3,368 (7,399)
Prepaid expenses and other assets 10,583 (2,413)
Accounts payable (10,233) (1,713)
Accrued expenses and other liabilities 826 (3,166)
Income tax payable 2,753 4,049
Net cash provided by operating activities 46,229 9,037
Cash flows from investing activities:    
Purchases of property, plant and equipment (1,950) (3,872)
Proceeds from disposals of property, plant and equipment   16
Proceeds from sales and maturities of available-for-sale investments 49,074 24,471
Purchases of available-for-sale investments (75,960) (29,517)
Acquisition of business (7,806)  
Net cash used in investing activities (36,642) (8,902)
Cash flows from financing activities:    
Proceeds from stock option exercises 369 1,377
Purchases of treasury stock (10,171) (5,559)
Dividend payments (4,367) (4,369)
Net cash used in financing activities (14,169) (8,551)
Net decrease in cash and cash equivalents (4,582) (8,416)
Effect of exchange rate changes 772 1,079
Cash and cash equivalents, beginning of period 86,433 79,895
Cash and cash equivalents, end of period 82,623 72,558
Supplemental disclosure of non-cash investing activities:    
Purchases of property, plant and equipment included in accounts payable $ 95 $ 509