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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Operating activities    
Net income $ 9,808 $ 2,276
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 18,075 18,883
Stock-based compensation expense 8,520 7,370
Deferred taxes (4,144) (5,605)
Interest on finance lease obligations 18 568
Loss on foreign currency translation 0 3,906
Gain on disposal of property and equipment (20) (428)
Other 64 215
Changes in operating assets and liabilities:    
Accounts receivable 113 1,106
Inventories 1,263 (551)
Prepaid expenses and other (829) 4,193
Income taxes 825 3,524
Accounts payable 537 (961)
Accrued liabilities and other 1,551 (2,629)
Net cash provided by operating activities 35,781 31,867
Investing activities    
Purchases of property, equipment and other capital assets (6,784) (6,829)
Proceeds from sales of property, equipment and other capital assets 30 623
Proceeds from call redemptions and maturities of marketable securities 10,419 14,020
Net cash provided by investing activities 3,665 7,814
Financing activities    
Proceeds from exercises of stock options 2,094 1,986
Purchases of shares withheld for tax obligations (1,920) (1,425)
Repurchases of common stock (26,940) (30,064)
Principal repayments of finance lease obligations (146) (163)
Net cash used in financing activities (26,912) (29,666)
Effect of exchange rate changes on cash and cash equivalents (175) (80)
Net increase in cash and cash equivalents 12,359 9,935
Cash and cash equivalents, beginning of period 83,790 56,558
Cash and cash equivalents, end of period $ 96,149 $ 66,493