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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating activities    
Net income $ 18,051 $ 12,200
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 6,259 4,250
Stock-based compensation expense 2,307 1,716
Deferred taxes 612 394
Amortization of held-to-maturity securities 163 301
Other 106 (56)
Changes in operating assets and liabilities:    
Accounts receivable (4,013) (4,777)
Inventories 807 435
Prepaid expenses and other (1,707) (688)
Income taxes 2,387 5,051
Accounts payable 2,291 319
Accrued liabilities and other (1,118) (353)
Net cash provided by operating activities 26,145 18,792
Investing activities    
Purchases of property and equipment (25,513) (7,812)
Cash used for acquisitions, net of cash acquired (90)
Purchases of marketable securities (3,389) (16,520)
Proceeds from maturities of marketable securities 13,551 10,755
Net cash used in investing activities (15,441) (13,577)
Financing activities    
Payments on debt (5,000)
Proceeds from exercises of stock options and other 2,252 194
Repurchase of common stock (2,662)
Net cash used in financing activities (2,748) (2,468)
Effect of exchange rate changes on cash and cash equivalents 432 346
Net increase in cash and cash equivalents 8,388 3,093
Cash and cash equivalents, beginning of period 36,707 68,795
Cash and cash equivalents, end of period $ 45,095 $ 71,888