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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net income $ 94,210 $ 89,483
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 11,641 10,794
Stock-based compensation 18,790 12,049
Loss on disposal of property, equipment and intangibles 93 632
Provision from doubtful accounts 622 (356)
Provision (benefit) from deferred income taxes 21 (274)
Changes in operating assets and liabilities:    
(Increase) decrease in accounts receivable (11,705) 20,209
(Increase) decrease in inventories (4,159) 1,075
Increase in other current assets (7,147) (1,694)
Increase in lease receivable, net (6,238) 0
Decrease (increase) in deferred costs and other contract assets 8,723 (7,809)
(Increase) decrease in other non-current assets (177) 430
(Decrease) increase in accounts payable (2,841) 1,820
Decrease in accrued compensation (6,997) (2,771)
(Decrease) increase in accrued liabilities (2,966) 1,776
Increase (decrease) in income tax payable 2,109 (895)
Increase in deferred revenue and other contract-related liabilities 5,566 3,397
Increase in other non-current liabilities 1,234 33
Net cash provided by operating activities 100,779 127,899
Cash flows from investing activities:    
Purchases of short-term investments (180,000) 0
Purchases of property and equipment, net (47,323) (9,430)
Increase in intangible assets (2,019) (3,643)
Net cash used in investing activities (229,342) (13,073)
Cash flows from financing activities:    
Proceeds from issuance of common stock 12,870 19,778
Payroll tax withholdings on behalf of employees for vested equity awards 123 168
Repurchases of common stock (27,854) (18,478)
Net cash (used in) provided by financing activities (15,107) 1,132
Effect of foreign currency exchange rates on cash (32) (1,647)
Net (decrease) increase in cash, cash equivalents, and restricted cash (143,702) 114,311
Cash, cash equivalents and restricted cash at end of period 408,784 429,647
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 408,939 $ 429,794