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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities:    
Net income $ 110,662 $ 184,564
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 71,188 72,531
Deferred income taxes (10,122) (4,214)
Stock-based compensation 26,394 25,571
Goodwill impairment 44,589 0
Impairment of long-lived assets 671 0
Unrealized (gain) loss on foreign currency transactions (21,759) 7,033
Other 6,823 854
Provisions for inventory, warranty and bad debt 42,559 38,748
Changes in assets and liabilities that provided (used) cash, net of acquisitions:    
Accounts receivable 2,308 (7,562)
Inventories (34,213) (51,032)
Prepaid expenses and other assets (2,065) 11,087
Accounts payable 8,819 (8,137)
Accrued expenses and other liabilities (17,492) (26,113)
Income and other taxes payable (28,345) (49,748)
Net cash provided by operating activities 200,017 193,582
Cash flows from investing activities:    
Purchases of and deposits on property, plant and equipment (61,871) (107,540)
Proceeds from sales of property, plant and equipment 689 348
Purchases of short-term and long-term investments (732,729) (557,674)
Proceeds from short-term investments 697,816 568,501
Acquisitions of businesses, net of cash acquired 0 (15,115)
Other 17 243
Net cash used in investing activities (96,078) (111,237)
Cash flows from financing activities:    
Proceeds from line-of-credit facilities 0 15
Payments on line-of-credit facilities 0 (15)
Principal payments on long-term borrowings (2,798) (2,747)
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 16,767 1,644
Purchase of treasury stock, at cost (37,884) (25,921)
Payment of purchase price holdback from business combination (1,650) 0
Net cash used in financing activities (25,565) (27,024)
Effect of changes in exchange rates on cash, cash equivalents and restricted cash 4,692 (16,561)
Net increase in cash, cash equivalents and restricted cash 83,066 38,760
Cash, cash equivalents and restricted cash — Beginning of period 682,984 544,358
Cash, cash equivalents and restricted cash — End of period 766,050 583,118
Supplemental disclosure of cash flow information:    
Cash paid for interest 1,650 1,655
Cash paid for income taxes 65,895 97,172
Non-cash transactions:    
Demonstration units transferred from inventory to other assets 6,724 8,892
Inventory transferred to machinery and equipment 2,362 8,250
Changes in accounts payable related to property, plant and equipment 1,248 2,721
Leased assets obtained in exchange for new operating lease liabilities $ 2,764 $ 11,944