CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Cash flows from operating activities:
Net income	$ 41,606	$ 23,542
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	9,003	7,372
Share-based compensation	2,966	2,146
Excess tax benefit from share-based compensation	(395)	(358)
Loss on sale of property and equipment	12	136
Deferred income taxes	18	990
Changes in assets and liabilities:
Accounts receivable, net	(4,793)	(516)
Inventories, net	1,663	6,943
Other assets	2,419	(137)
Accounts payable	(2,435)	(7,119)
Accrued liabilities	(9,670)	(12,787)
Deferred revenue	682	1,618
Income taxes	8,146	649
Other operating activities	533	1,685
Net cash provided by operating activities	49,755	24,164
Cash flows from investing activities:
Purchases of property and equipment	(2,374)	(1,952)
Acquisition of intangible assets	0	(500)
Purchases of long-term investments	(405)	(604)
Purchases of investments and marketable securities	(151,817)	(106,947)
Maturities of investments and marketable securities	15,996	3,144
Proceeds from sales of investments and marketable securities	72,206	65,094
Net cash used in investing activities	(66,394)	(41,765)
Cash flows from financing activities:
Purchase of treasury stock	0	(3,888)
Proceeds from exercise of stock options and stock purchase plan purchases	4,936	5,913
Excess tax benefit from share-based compensation	395	358
Net cash provided by financing activities	5,331	2,383
Effect of exchange rate changes on cash	(95)	70
Net decrease in cash and cash equivalents	(11,403)	(15,148)
Cash and cash equivalents at beginning of period	62,827	64,740
Cash and cash equivalents at end of period	51,424	49,592
Supplemental disclosures of cash flow information:
Income taxes paid, net	$ 3,304	$ 2,271