CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income	$ 54,108	$ 60,817
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	15,412	11,964
Share-based compensation	6,504	8,045
Excess tax benefit from share-based compensation	(3,727)	(1,358)
Loss on sale of property and equipment	182	147
Gain on sale of business	0	(613)
Deferred income taxes	4,439	367
Changes in assets and liabilities:
Accounts receivable, net	(1,976)	(657)
Inventories, net	14,190	16,599
Other assets	1,313	527
Accounts payable	3,263	(9,594)
Accrued liabilities	(6,094)	(11,422)
Deferred revenue	1,585	1,460
Income taxes	476	10,714
Other operating activities	1,381	(2,341)
Net cash provided by operating activities	91,056	84,655
Cash flows from investing activities:
Purchases of property and equipment	(8,547)	(10,599)
Proceeds from the sale of business	0	13,790
Acquisition of intangible assets	(500)	0
Purchase of long-term equity investment	(604)	(5,000)
Purchases of investments and marketable securities	(231,174)	(313,863)
Maturities of investments and marketable securities	19,188	228,105
Proceeds from sales of investments and marketable securities	142,230	95,106
Net cash provided by (used in) investing activities	(79,407)	7,539
Cash flows from financing activities:
Purchase of treasury stock	(28,563)	(24,645)
Proceeds from exercise of stock options and stock purchase plan purchases	4,104	142
Excess tax benefit from share-based compensation	3,727	1,358
Net cash used in financing activities	(20,732)	(23,145)
Effect of exchange rate changes on cash	229	(99)
Net increase (decrease) in cash and cash equivalents	(8,854)	68,950
Cash and cash equivalents at beginning of period	64,740	36,418
Cash and cash equivalents at end of period	55,886	105,368
Supplemental disclosures of cash flow information:
Income taxes paid	$ 5,346	$ 13,479