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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net income (loss) $ 896 $ (9,969)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization 4,122 4,365
(Gain) loss on investments (1,161) 10,877
Stock-based compensation expense 1,807 1,791
Other 84 115
Changes in operating assets and liabilities:    
Accounts receivable, net (4,762) 3,052
Other receivables (1,220) (6,707)
Inventory, net 1,893 (1,598)
Prepaid expenses and other assets (417) 2,206
Accounts payable, net 5,629 2,712
Accrued expenses and other liabilities 3,317 (6,680)
Income taxes payable 497 (188)
Net cash provided by (used in) operating activities 10,685 (24)
Cash flows from investing activities:    
Purchases of property, plant and equipment (741) (1,406)
Proceeds from sales and maturities of available-for-sale investments 10,087 46,440
Purchases of available-for-sale investments (11,350) (16,879)
Acquisition of note receivable   (523)
Net cash provided by (used in) investing activities (2,004) 27,632
Cash flows from financing activities:    
Dividend payments (4,361) (4,328)
Proceeds from stock option exercises 1,244  
Tax withholdings related to stock-based compensation settlements (113)  
Repayment of bonds payable   (24,600)
Net cash used in financing activities (3,230) (28,928)
Net increase (decrease) in cash, cash equivalents and restricted cash 5,451 (1,320)
Effect of exchange rate changes (1,734) (1,168)
Cash, cash equivalents and restricted cash, beginning of period 60,179 73,773
Cash, cash equivalents and restricted cash, end of period 63,896 71,285
Supplemental Cash Flow Information:    
Right-of-use assets obtained in exchange for lease obligations 248 85
Non-cash Investing Activities:    
Purchases of property, plant and equipment included in accounts payable $ 199 $ 302