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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities:    
Net income (loss) $ (9,217) $ 4,765
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 8,404 8,913
Asset impairments 65  
Amortization of net premium on available-for-sale investments 86 (57)
Net (gain) loss on long-term investments 1,025 (8,411)
Net loss on disposal of property, plant and equipment 52 58
Gain on contingency   (1,230)
Gain on life insurance proceeds   (1,000)
Stock-based compensation expense 3,446 3,313
Deferred income taxes (5) (1,880)
Changes in operating assets and liabilities:    
Accounts receivable, net (4,727) (17,288)
Other receivables (9,468) 11,678
Inventory (7,878) 4,612
Prepaid expenses and other assets 1,444 4,715
Accounts payable, net 17,389 5,009
Accrued expenses and other liabilities 2,097 640
Income taxes payable (1,032) (2,830)
Net cash provided by operating activities 1,681 11,007
Cash flows from investing activities:    
Purchases of property, plant and equipment (3,148) (4,307)
Proceeds from sales and maturities of available-for-sale investments 63,318 24,306
Purchases of available-for-sale investments (31,897) (21,544)
Acquisition of note receivable (523)  
Life insurance proceeds received   1,000
Acquisition of business   13
Net cash provided by (used in) investing activities 27,750 (532)
Cash flows from financing activities:    
Proceeds from stock option exercises   526
Purchases of treasury stock   (184)
Dividend payments (8,665) (8,604)
Repayment of bonds payable (24,600)  
Net cash used in financing activities (33,265) (8,262)
Net increase (decrease) in cash, cash equivalents and restricted cash (3,834) 2,213
Effect of exchange rate changes 306 (900)
Cash, cash equivalents and restricted cash, beginning of period 73,773 105,504
Cash, cash equivalents and restricted cash, end of period 70,245 106,817
Supplemental disclosure of non-cash investing activities:    
Purchases of property, plant and equipment included in accounts payable $ 198 $ 205