Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jul. 02, 2011	Jul. 03, 2010
Cash flows from operating activities:
Net income	$ 27,872	$ 13,962
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,386	8,139
Stock-based compensation	2,256	1,491
Net disposals and impairments of assets	89	(2)
Excess tax benefits from stock-based compensation	(1,132)	(901)
Deferred income taxes	2,819	(1,363)
Changes in operating assets and liabilities:
Accounts receivable	2,775	3,596
Inventories	(932)	(790)
Income taxes	1,181	2,059
Prepaid expenses and other assets	(3,212)	33
Accounts payable	(682)	(1,126)
Customer prepayments	(2,451)	(284)
Accrued compensation and benefits	(2,716)	4,578
Other taxes and withholding	(320)	(618)
Warranty liabilities	(314)	(96)
Other accruals and liabilities	2,066	(89)
Net cash provided by operating activities	33,685	28,589
Cash flows from investing activities:
Investments in marketable debt securities	(40,021)	0
Purchases of property and equipment	(9,585)	(1,744)
Increase in restricted cash	(2,650)	0
Proceeds from sales of property and equipment	7	3
Net cash used in investing activities	(52,249)	(1,741)
Cash flows from financing activities:
Net decrease in short-term borrowings	(1,500)	(1,573)
Excess tax benefits from stock-based compensation	1,132	901
Proceeds from issuance of common stock	870	120
Repurchases of common stock	(309)	(1,360)
Debt issuance costs	0	(139)
Net cash provided by (used in) financing activities	193	(2,051)
Net (decrease) increase in cash and cash equivalents	(18,371)	24,797
Cash and cash equivalents, at beginning of period	76,016	12,184
Cash and cash equivalents, at end of period	$ 57,645	$ 36,981