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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Cash flows from operating activities:      
Net loss $ (4,445) $ (3,736)  
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:      
Depreciation and amortization 12,246 12,525  
Gain on investments (3,320) (1,819)  
Stock-based compensation expense 5,457 5,056  
Deferred income taxes 437 (1)  
Other 89 195  
Asset impairments   65  
Changes in operating assets and liabilities:      
Accounts receivable, net (26,346) (9,131)  
Other receivables 11,152 (6,224)  
Inventory, net (2,669) (21,170)  
Prepaid expenses, other current assets and other assets (8,514) (672)  
Accounts payable 29,614 14,204  
Accrued expenses and other liabilities 10,392 5,618  
Income taxes payable, net 4,798 (227)  
Net cash provided by (used in) operating activities 28,891 (5,317)  
Cash flows from investing activities:      
Purchases of property, plant and equipment (3,572) (5,082)  
Proceeds from sales and maturities of available-for-sale investments 28,305 86,145  
Purchases of available-for-sale investments (28,853) (42,641)  
Acquisition of note receivable   (523)  
Insurance proceeds received 500    
Net cash (used in) provided by investing activities (3,620) 37,899  
Cash flows from financing activities:      
Proceeds from stock option exercises 6,111    
Tax withholdings related to stock-based compensation settlements (113)    
Dividend payments (13,124) (12,993)  
Repayment of bonds payable   (24,600)  
Net cash used in financing activities (7,126) (37,593)  
Net increase (decrease) in cash, cash equivalents and restricted cash 18,145 (5,011)  
Effect of exchange rate changes (2,719) 2,641  
Cash, cash equivalents and restricted cash, beginning of period 60,179 73,773 $ 73,773
Cash, cash equivalents and restricted cash, end of period 75,605 71,403 $ 60,179
Supplemental disclosure of non-cash investing activities:      
Right-of-use assets obtained in exchange for lease obligations 1,833 231  
Purchases of property, plant and equipment included in accounts payable $ 100 $ 442