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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net income $ 49,322 $ 45,630
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 5,419 5,241
Stock-based compensation 7,317 5,332
Loss on disposal of property, equipment and intangibles 65 429
Provision from doubtful accounts 234 (394)
Benefit from deferred income taxes (31) 0
Changes in operating assets and liabilities:    
(Increase) decrease in accounts receivable (8,531) 17,776
Decrease in inventories 1,357 1,139
Decrease (increase) in other current assets 3,043 (204)
Increase in lease receivable, net (3,104) 0
Decrease (increase) in deferred costs and other contract assets 7,120 (5,706)
(Increase) decrease in other non-current assets (115) 644
(Decrease) increase in accounts payable (6,097) 2,363
Decrease in accrued compensation (19,364) (11,074)
(Decrease) increase in accrued liabilities (2,736) 2,193
Increase in income tax payable 5,566 6,318
Increase in deferred revenue and other contract-related liabilities 2,377 2,381
Increase (decrease) in other non-current liabilities 626 (73)
Net cash provided by operating activities 42,468 71,995
Cash flows from investing activities:    
Purchases of short-term investments (180,000) 0
Purchases of property and equipment, net (6,963) (3,788)
Increase in intangible assets (1,040) (3,583)
Net cash used in investing activities (188,003) (7,371)
Cash flows from financing activities:    
Proceeds from issuance of common stock 6,288 8,415
Payroll tax withholdings on behalf of employees for vested equity awards 123 168
Repurchases of common stock 0 (18,479)
Net cash provided by (used in) financing activities 6,165 (10,232)
Effect of foreign currency exchange rates on cash (261) (225)
Net (decrease) increase in cash, cash equivalents, and restricted cash (139,631) 54,167
Cash, cash equivalents and restricted cash at end of period 412,861 369,498
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 413,010 $ 369,650