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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Cash flows from operating activities:    
Net income $ 131,248 $ 85,373
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 14,384 12,355
Stock-based compensation 11,192 9,693
Gain (Loss) on Disposition of Property Plant Equipment 420 478
Deconsolidation, Gain (Loss), Amount 0 (273)
Deferred Income Tax Expense (Benefit) 0 5,002
Changes in operating assets and liabilities:    
Increase in accounts receivable (17,277) (13,398)
Increase in inventories (25,998) (5,092)
Increase (Decrease) in Other Current Assets (11,099) (12,911)
Increase in deferred cost of goods sold (16,166) (11,278)
Increase (Decrease) in Other Noncurrent Assets (964) (2,117)
Increase in accounts payable 3,748 9,386
Decrease in accrued compensation (9,094) (810)
Decrease in accrued liabilities (66,918) (384)
(Decrease) increase in deferred revenue (5,905) 10,934
Increase in other non-current liabilities 1,456 1,072
Net cash provided by operating activities 9,027 88,030
Cash flows from investing activities:    
Purchases of property and equipment, net (37,830) (13,697)
Increase in intangible assets (2,220) (3,969)
Payments to Acquire Long-term Investments (1,145) (200)
Deconsolidation, Variable Interest Entity, Reduction of Cash 0 (763)
Net cash used in investing activities (41,195) (18,629)
Cash flows from financing activities:    
Proceeds from (Repayments of) Lines of Credit 0 45,000
Repayments of Lines of Credit 0 (77,500)
Payments of Debt Issuance Costs 0 (621)
Repayments of capital lease obligations (71) (72)
Proceeds from issuance of common stock 55,709 26,063
Repurchases of common stock (42,608) (68,218)
Net cash provided by (used in) financing activities 13,030 (75,348)
Effect of foreign currency exchange rates on cash 3,112 (382)
Net decrease in cash and cash equivalents (16,026) (6,329)
Cash and cash equivalents at beginning of period 305,970 132,317
Cash and cash equivalents at end of period $ 289,944 $ 125,988