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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Cash flows from operating activities:    
Net income $ 45,630 $ 51,533
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 5,241 4,736
Stock-based compensation 5,332 2,889
Gain (Loss) on Disposition of Property Plant Equipment 429 144
Provision for Doubtful Accounts (394) 60
Changes in operating assets and liabilities:    
Decrease (increase) in accounts receivable 17,776 (2,687)
Decrease (increase) in inventories 1,139 (7,381)
Increase in other current assets (204) (3,125)
Increase in deferred costs and other contract assets (5,706) (7,643)
Decrease in other non-current assets 644 878
Increase in accounts payable 2,363 1,470
Decrease in accrued compensation (11,074) (19,088)
Increase (decrease) in accrued liabilities 2,193 (94)
Increase (decrease) in income tax payable 6,318 (4,845)
Increase (decrease) in deferred revenue and other contract-related liabilities 2,381 (4,043)
(Decrease) increase in other non-current liabilities (73) 1,094
Net cash provided by operating activities 71,995 13,898
Cash flows from investing activities:    
Purchases of property and equipment, net (3,788) (4,394)
Increase in intangible assets (3,583) (833)
Net cash used in investing activities (7,371) (5,227)
Cash flows from financing activities:    
Repayments of capital lease obligations 0 (69)
Proceeds from issuance of common stock 8,415 27,290
Payments Related to Tax Withholding for Share-based Compensation 168 0
Repurchases of common stock (18,479) 0
Net cash provided by (used in) financing activities (10,232) 27,221
Effect of foreign currency exchange rates on cash (225) 414
Net increase in cash, cash equivalents, and restricted cash 54,167 36,306
Cash, cash equivalents and restricted cash at end of period 369,498 343,825
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 369,650 $ 344,504