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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Cash flows from operating activities:    
Net income $ 89,483 $ 96,671
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 10,794 9,462
Stock-based compensation 12,049 6,142
Loss on disposal of property, equipment and intangibles 632 365
Provision for doubtful accounts (356) (193)
Provision for deferred income taxes (274) 0
Changes in operating assets and liabilities:    
Decrease (increase) in accounts receivable 20,209 (2,094)
Decrease (increase) in inventories 1,075 (15,615)
Increase in other current assets (1,694) (14,121)
Increase in deferred costs and other contract assets (7,809) (12,871)
Decrease in other non-current assets 430 871
Increase in accounts payable 1,820 3,138
Decrease in accrued compensation (2,771) (11,679)
Increase in accrued liabilities 1,776 3,600
Decrease in income tax payable (895) (71,496)
Increase (decrease) in deferred revenue and other contract-related liabilities 3,397 (8,424)
Increase in other non-current liabilities 33 985
Net cash provided by (used in) operating activities 127,899 (15,259)
Cash flows from investing activities:    
Purchases of property and equipment, net (9,430) (8,512)
Increase in intangible assets (3,643) (1,574)
Net cash used in investing activities (13,073) (10,086)
Cash flows from financing activities:    
Repayments of capital lease obligations 0 (70)
Proceeds from issuance of common stock 19,778 48,218
Payroll tax withholdings on behalf of employees for vested equity awards 168 0
Repurchases of common stock (18,478) 0
Net cash provided by financing activities 1,132 48,148
Effect of foreign currency exchange rates on cash (1,647) 1,825
Net increase in cash, cash equivalents, and restricted cash 114,311 24,628
Cash, cash equivalents and restricted cash at end of period 429,647 331,448
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 429,794 $ 332,826