Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013
Cash flows from operating activities:
Net Income	$ 33,161	$ 15,774
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	16,884	15,173
Change in deferred income tax provision	3,827	1,886
Gain on sale of auction rate securities	(1,698)	0
Stock-based compensation	9,543	6,985
Changes in assets and liabilities:
Accounts receivable, net	323	(6,044)
Inventories	(18,852)	1,899
Prepaid expenses and other current assets	(3,289)	(2,177)
Accounts payable and accrued expenses	(3,045)	(1,354)
Accrued payroll obligations	(1,339)	4,957
Deferred income and allowances on sales to sell-through distributors	3,799	7,034
Net cash provided by operating activities	39,314	44,133
Cash flows from investing activities:
Proceeds from sales or maturities of short-term marketable securities	83,615	39,176
Proceeds from sales of auction rate securities	5,488	0
Purchase of marketable securities	(116,421)	(64,303)
Capital expenditures	(6,873)	(10,237)
Other investing activities, primarily time based software licenses	(3,800)	(5,939)
Net cash used in investing activities	(37,991)	(41,303)
Cash flows from financing activities:
Net share settlement upon issuance of RSUs	(2,682)	(581)
Purchase of treasury stock	(1,700)	(2,452)
Net proceeds from issuance of common stock	11,177	2,642
Net cash provided by (used in) financing activities	6,795	(391)
Effect of exchange rate change on cash	579	(205)
Net increase in cash and cash equivalents	8,697	2,234
Beginning cash and cash equivalents	114,310	118,536
Ending cash and cash equivalents	123,007	120,770
Supplemental cash flow information:
Unrealized (loss) gain related to marketable securities, net, included in Accumulated other comprehensive income	(182)	292
Income taxes paid, net of refunds	1,090	1,081
Increase in fixed assets related to asset retirement obligations	249	0
Accrued purchases of plant and equipment	$ (84)	$ (545)