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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Operating activities    
Net income $ 26,591 $ 31,677
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 15,855 14,981
Stock-based compensation expense 6,672 6,526
Deferred taxes 5,651 1,585
Amortization of held-to-maturity securities 129 7
Other (854) (279)
Changes in operating assets and liabilities:    
Accounts receivable (4,292) (3,461)
Inventories (801) 392
Prepaid expenses and other (1,068) 24
Income taxes (1,341) 4,833
Accounts payable 1,082 3,848
Accrued liabilities and other 5,793 (5,245)
Net cash provided by operating activities 53,417 54,888
Investing activities    
Purchases of property, equipment and other capital assets (33,305) (34,136)
Purchases of other assets and investments (3,000) (4,000)
Purchases of marketable securities (57,212) (8,983)
Proceeds from maturities of marketable securities 28,225 29,170
Net cash used in investing activities (65,292) (17,949)
Financing activities    
Proceeds from exercises of stock options 2,855 2,243
Purchases of shares withheld for tax obligations (3,367) (2,418)
Repurchases of common stock (14,686) (21,410)
Net cash used in financing activities (15,198) (21,585)
Effect of exchange rate changes on cash and cash equivalents (149) 135
Net (decrease) increase in cash and cash equivalents (27,222) 15,489
Cash and cash equivalents, beginning of period 125,225 85,046
Cash and cash equivalents, end of period $ 98,003 $ 100,535