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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Cash flows from operating activities:    
Net income $ 143,295 $ 146,609
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 17,569 15,959
Stock-based compensation 29,645 19,695
Loss on disposal of property, equipment and intangibles 149 641
Provision (benefit) from doubtful accounts 678 (401)
Benefit from deferred income taxes (19) (6,747)
Changes in operating assets and liabilities:    
(Increase) decrease in accounts receivable (21,697) 17,384
Increase in inventories (15,221) (1,069)
Increase in other current assets (12,060) (15,606)
Increase in lease receivable, net (9,396) 0
Decrease (increase) in deferred costs and other contract assets 8,901 (10,400)
(Increase) decrease in other non-current assets (68) 496
(Decrease) increase in accounts payable (1,223) 4,090
(Decrease) increase in accrued compensation (975) 1,919
Increase in accrued liabilities 389 5,695
Increase in income tax payable 3,430 410
Increase in deferred revenue and other contract-related liabilities 6,760 3,981
Increase (decrease) in other non-current liabilities 1,259 (6,351)
Net cash provided by operating activities 151,416 176,305
Cash flows from investing activities:    
Purchases of short-term investments, net (120,000) 0
Purchases of property and equipment, net (56,064) (12,299)
Increase in intangible assets (2,968) (4,718)
Business combination, net of cash acquired, and strategic investments 0 4,000
(Purchases of) proceeds from strategic investments, net 5,189 (453)
Net cash used in investing activities (184,221) (20,564)
Cash flows from financing activities:    
Proceeds from issuance of common stock 22,706 42,297
Payroll tax withholdings on behalf of employees for vested equity awards 123 168
Repurchases of common stock (27,924) (18,478)
Net cash (used in) provided by financing activities (5,341) 23,651
Effect of foreign currency exchange rates on cash (983) (1,230)
Net (decrease) increase in cash, cash equivalents and restricted cash (39,129) 178,162
Cash, cash equivalents and restricted cash at end of period 513,360 493,488
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 513,512 $ 493,645