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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net income (loss) $ 770 $ (10,814)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 4,496 3,614
Amortization of net premium on available-for-sale investments 6 42
Net (gain) loss on long-term investments (5,926) 97
Net (gain) loss on disposal of property, plant and equipment (6) 67
Gain on bargain purchase of a business   (11,322)
Stock-based compensation expense 1,859 1,819
Deferred income taxes 235 (1,877)
Changes in operating assets and liabilities:    
Accounts receivable, net 170 63,904
Other receivables 2,001 (6,598)
Inventory, net 5,974 3,368
Prepaid expenses and other assets 2,809 10,583
Accounts payable, net 166 (10,233)
Accrued expenses and other liabilities (2,355) 826
Income tax payable (487) 2,753
Net cash provided by operating activities 9,712 46,229
Cash flows from investing activities:    
Purchases of property, plant and equipment (1,872) (1,950)
Proceeds from sales and maturities of debt and equity investments 17,039 49,074
Purchases of debt and equity investments (15,318) (75,960)
Acquisition of business   (7,806)
Net cash used in investing activities (151) (36,642)
Cash flows from financing activities:    
Proceeds from stock option exercises   369
Purchases of treasury stock (184) (10,171)
Dividend payments (4,301) (4,367)
Net cash used in financing activities (4,485) (14,169)
Net increase (decrease) in cash and cash equivalents 5,076 (4,582)
Effect of exchange rate changes (1,461) 772
Cash and cash equivalents, beginning of period 105,504 86,433
Cash and cash equivalents, end of period 109,119 82,623
Supplemental disclosure of non-cash investing activities:    
Purchases of property, plant and equipment included in accounts payable $ 273 $ 95