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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Apr. 01, 2017
Apr. 02, 2016
Cash flows from operating activities:    
Net income $ 45,334 $ 27,577
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 4,736 4,051
Stock-based compensation 2,889 3,027
Gain (Loss) on Disposition of Property Plant Equipment 144 152
Deconsolidation, Gain (Loss), Amount 0 (273)
Provision for doubtful accounts 60 127
Changes in operating assets and liabilities:    
Increase in accounts receivable (2,687) (12,266)
Increase in inventories (7,655) (326)
(Increase) decrease in deferred cost of goods sold (8,158) 1,799
Increase (Decrease) in Other Noncurrent Assets (188) (621)
Increase (Decrease) in Other Current Assets (3,106) 307
Increase in accounts payable 1,470 339
Decrease in accrued compensation (19,088) (12,634)
(Decrease) increase in accrued liabilities (1,960) (932)
Increase in deferred revenue 2,563 5,427
Increase in other non-current liabilities 1,094 352
Net cash provided by operating activities 15,448 18,803
Deferred Income Tax Expense (Benefit) 0 2,697
Cash flows from investing activities:    
Purchases of property and equipment, net (4,394) (5,346)
Increase in intangible assets (833) (751)
Deconsolidation, Variable Interest Entity, Reduction of Cash 0 (763)
Net cash used in investing activities (5,227) (6,860)
Cash flows from financing activities:    
Proceeds from (Repayments of) Lines of Credit 0 45,000
Repayments of Lines of Credit 0 (5,000)
Repayments of capital lease obligations (69) (67)
Proceeds from issuance of common stock 27,290 2,552
Repurchases of common stock 0 (47,699)
Net cash provided by (used in) financing activities 27,221 (5,214)
Effect of foreign currency exchange rates on cash 413 855
Net increase in cash and cash equivalents 37,855 7,584
Cash and cash equivalents at beginning of period 305,970 132,317
Cash and cash equivalents at end of period $ 343,825 $ 139,901