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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash flows from operating activities:    
Net income $ 203,657 $ 212,598
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 69,852 72,127
Deferred income taxes (21,550) (4,757)
Stock-based compensation 29,201 28,536
Impairment of long-lived assets and other restructuring charges 919 0
Unrealized loss (gain) on foreign currency transactions 8,355 (4,313)
Gain on divestiture (21,748) 0
Other 4,195 5,828
Provisions for inventory, warranty and bad debt 58,990 50,364
Changes in assets and liabilities that provided (used) cash, net of acquisitions:    
Accounts receivable 42,517 (12,281)
Inventories (148,959) (105,384)
Prepaid expenses and other assets 6,584 (8,823)
Accounts payable (2,837) 26,296
Accrued expenses and other liabilities (40,327) 7,963
Income and other taxes payable (17,823) 37,002
Net cash provided by operating activities 171,026 305,156
Cash flows from investing activities:    
Purchases of and deposits on property, plant and equipment (84,552) (93,857)
Proceeds from sales of property, plant and equipment 837 859
Purchases of short-term investments (914,598) (1,437,193)
Proceeds from short-term investments 1,355,883 1,226,445
Acquisitions of businesses, net of cash acquired (2,000) 0
Proceeds from divestiture, net of cash sold 52,141 0
Other (246) (1,078)
Net cash provided by (used in) investing activities 407,465 (304,824)
Cash flows from financing activities:    
Principal payments on long-term borrowings (17,829) (2,851)
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 2,353 11,427
Purchase of treasury stock, at cost (382,885) (78,071)
Payment of purchase price holdback from business combination 0 (2,624)
Purchase of non-controlling interests (2,500) 0
Net cash used in financing activities (400,861) (72,119)
Effect of changes in exchange rates on cash, cash equivalents and restricted cash (17,461) (11,862)
Net increase (decrease) in cash, cash equivalents and restricted cash 160,169 (83,649)
Cash, cash equivalents and restricted cash — Beginning of period 709,105 878,553
Cash and cash equivalents — End of period 869,274 794,904
Supplemental disclosure of cash flow information:    
Cash paid for interest 2,766 1,932
Cash paid for income taxes 83,771 35,982
Non-cash transactions:    
Demonstration units transferred from inventory to other assets 3,520 4,245
Inventory transferred to machinery and equipment 2,439 1,965
Changes in accounts payable related to property, plant and equipment 1,989 1,461
Leased assets obtained in exchange for new operating lease liabilities $ 6,237 $ 2,500