Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011
Cash flows from operating activities:
Net income	$ 65,599	$ 45,108
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	14,411	9,786
Stock-based compensation	9,570	3,674
Net loss on disposals and impairments of assets	86	92
Excess tax benefits from stock-based compensation	(4,947)	(1,700)
Deferred income taxes	(737)	2,579
Changes in operating assets and liabilities:
Accounts receivable	(1,237)	1,936
Inventories	(4,146)	(1,349)
Income taxes	10,715	5,187
Prepaid expenses and other assets	(6,031)	(3,486)
Accounts payable	10,565	2,887
Customer prepayments	1,882	670
Accrued compensation and benefits	(6,588)	1,176
Other taxes and withholding	2,291	2,199
Warranty liabilities	(1,247)	1,210
Other accruals and liabilities	7,450	4,556
Net cash provided by operating activities	97,636	74,525
Cash flows from investing activities:
Purchases of property and equipment	(36,816)	(14,492)
Investments in marketable debt securities	(63,240)	(40,021)
Proceeds from maturities of marketable debt securities	10,103	0
Proceeds from sales of property and equipment	42	11
Increase in restricted cash	0	(2,650)
Net cash used in investing activities	(89,911)	(57,152)
Cash flows from financing activities:
Repurchases of common stock	(24,071)	(350)
Excess tax benefits from stock-based compensation	4,947	1,700
Net increase (decrease) in short-term borrowings	2,323	(537)
Proceeds from issuance of common stock	3,279	2,165
Debt issuance costs	(50)	0
Net cash (used in) provided by financing activities	(13,572)	2,978
Net (decrease) increase in cash and cash equivalents	(5,847)	20,351
Cash and cash equivalents, at beginning of period	116,255	76,016
Cash and cash equivalents, at end of period	$ 110,408	$ 96,367