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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:    
Net income (loss) $ (9,969) $ 770
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 4,365 4,496
Asset impairments 65  
Amortization of net premium on available-for-sale investments 61 6
Net (gain) loss on long-term investments 10,877 (5,926)
Net (gain) loss on disposal of property, plant and equipment 52 (6)
Stock-based compensation expense 1,791 1,859
Deferred income taxes (63) 235
Changes in operating assets and liabilities:    
Accounts receivable, net 3,052 170
Other receivables (6,707) 2,001
Inventory, net (1,598) 5,974
Prepaid expenses and other assets 2,206 2,809
Accounts payable, net 2,712 166
Accrued expenses and other liabilities (6,680) (2,355)
Income taxes payable (188) (487)
Net cash provided by (used in) operating activities (24) 9,712
Cash flows from investing activities:    
Purchases of property, plant and equipment (1,406) (1,872)
Proceeds from sales and maturities of available-for-sale investments 46,440 17,039
Purchases of available-for-sale investments (16,879) (15,318)
Acquisition of note receivable (523)  
Net cash provided by (used in) investing activities 27,632 (151)
Cash flows from financing activities:    
Purchases of treasury stock   (184)
Dividend payments (4,328) (4,301)
Repayment of bonds payable (24,600)  
Net cash used in financing activities (28,928) (4,485)
Net increase (decrease) in cash and cash equivalents (1,320) 5,076
Effect of exchange rate changes (1,168) (1,461)
Cash and cash equivalents, beginning of period 73,773 105,504
Cash and cash equivalents, end of period 71,285 109,119
Supplemental disclosure of non-cash investing activities:    
Purchases of property, plant and equipment included in accounts payable $ 302 $ 273