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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net income $ 68,222 $ 36,766
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 23,819 24,099
Deferred income taxes 3,944 (935)
Stock-based compensation 8,815 8,430
Unrealized gain on foreign currency transactions (7,800) (19,589)
Other 1,462 1,015
Provisions for inventory, warranty and bad debt 16,685 13,486
Changes in assets and liabilities that provided (used) cash, net of acquisitions:    
Accounts receivable 7,360 34,492
Inventories (20,084) (10,429)
Prepaid expenses and other assets (1,052) (9,119)
Accounts payable 18,980 6,054
Accrued expenses and other liabilities (17,961) (6,477)
Income and other taxes payable (14,847) (21,012)
Net cash provided by operating activities 87,543 56,781
Cash flows from investing activities:    
Purchases of and deposits on property, plant and equipment (27,421) (17,801)
Proceeds from sales of property, plant and equipment 130 139
Purchases of short-term investments (513,564) (308,195)
Proceeds from short-term investments 480,163 186,024
Other (2) 79
Net cash used in investing activities (60,694) (139,754)
Cash flows from financing activities:    
Principal payments on long-term borrowings (946) (928)
Proceeds from issuance of common stock under employee stock option and purchase plans less payments for taxes related to net share settlement of equity awards 4,981  
Proceeds from issuance of common stock under employee stock option and purchase plans less payments for taxes related to net share settlement of equity awards   (5,498)
Purchase of treasury stock, at cost (3,048) (12,716)
Payment of purchase price holdback from business combination (2,624) (1,650)
Net cash used in financing activities (1,637) (20,792)
Effect of changes in exchange rates on cash, cash equivalents and restricted cash (7,024) (6,878)
Net increase in cash, cash equivalents and restricted cash 18,188 (110,643)
Cash, cash equivalents and restricted cash — Beginning of period 878,553 682,984
Cash and cash equivalents — End of period 896,741 572,341
Supplemental disclosure of cash flow information:    
Cash paid for interest 703 447
Cash paid for income taxes 21,340 29,865
Non-cash transactions:    
Demonstration units transferred from inventory to other assets 1,109 1,086
Inventory transferred to machinery and equipment 727 1,294
Changes in accounts payable related to property, plant and equipment 863 6,983
Leased assets obtained in exchange for new operating lease liabilities $ 409 $ 830