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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net income $ 146,609 $ 132,524
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 15,959 14,384
Stock-based compensation 19,695 11,192
Loss on disposal of property, equipment and intangibles 641 420
Benefit from doubtful accounts (401) 0
Benefit from deferred income taxes (6,747) 0
Changes in operating assets and liabilities:    
Decrease (increase) in accounts receivable 17,384 (17,277)
Increase in inventories (1,069) (26,354)
Increase in other current assets (15,606) (9,095)
Increase in deferred costs and other contract assets (10,400) (9,175)
Decrease (increase) in other non-current assets 496 (3,525)
Increase in accounts payable 4,090 3,748
Increase (decrease) in accrued compensation 1,919 (9,094)
Increase in accrued liabilities 5,695 393
Increase (decrease) income tax payable 410 (71,177)
Increase (decrease) in deferred revenue and other contract-related liabilities 3,981 (11,039)
(Decrease) increase in other non-current liabilities (6,351) 1,456
Net cash provided by operating activities 176,305 7,381
Cash flows from investing activities:    
Purchases of property and equipment, net (12,299) (37,830)
Increase in intangible assets (4,718) (2,220)
Acquisition, net of cash acquired and long-term investments 4,000 1,145
Proceeds from sale of equity investments 453 0
Net cash used in investing activities (20,564) (41,195)
Cash flows from financing activities:    
Repayments of capital lease obligations 0 (71)
Proceeds from issuance of common stock 42,297 55,709
Payroll tax withholdings on behalf of employees for vested equity awards 168 0
Repurchases of common stock (18,478) (42,608)
Net cash provided by financing activities 23,651 13,030
Effect of foreign currency exchange rates on cash (1,230) 3,112
Net increase in cash, cash equivalents, and restricted cash 178,162 (17,672)
Cash, cash equivalents and restricted cash at end of period 493,488 289,944
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 493,645 $ 290,526