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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Operating activities    
Net income $ 16,997 $ 10,230
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 26,984 28,213
Stock-based compensation expense 12,716 11,811
Deferred taxes (6,140) (9,197)
Interest on finance lease obligations 26 859
Loss on impairment of equipment 256 0
Loss on foreign currency translation 0 3,906
Gain on disposal of property and equipment (24) (498)
Other 103 122
Changes in operating assets and liabilities:    
Accounts receivable 4,581 (3,058)
Inventories 1,321 (150)
Prepaid expenses and other (312) 4,127
Income taxes 2,583 4,693
Accounts payable (2,709) 746
Accrued liabilities and other 4,153 4,242
Net cash provided by operating activities 60,535 56,046
Investing activities    
Purchases of property, equipment and other capital assets (8,339) (9,935)
Proceeds from sales of property, equipment and other capital assets 34 693
Purchases of marketable securities (18,087) 0
Proceeds from call redemptions and maturities of marketable securities 15,709 19,115
Net cash (used in) provided by investing activities (10,683) 9,873
Financing activities    
Proceeds from exercises of stock options and employee stock purchases 2,094 1,986
Purchases of shares withheld for tax obligations (1,920) (1,436)
Repurchases of common stock (45,958) (39,053)
Principal repayments of finance lease obligations (220) (234)
Net cash used in financing activities (46,004) (38,737)
Effect of exchange rate changes on cash and cash equivalents 235 (244)
Net increase in cash and cash equivalents 4,083 26,938
Cash and cash equivalents, beginning of period 83,790 56,558
Cash and cash equivalents, end of period $ 87,873 $ 83,496