Unaudited Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013
Cash flows from operating activities:
Net income	$ 29,116	$ 29,328
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	17,399	14,329
Purchase premium amortization/discount accretion on investments, net	69	621
Non-cash stock-based compensation	10,064	7,981
Income tax (benefit) expense associated with stock option exercises	(302)	514
Excess tax benefit from stock-based compensation	(294)	(569)
Deferred income taxes	(244)	(2,178)
Changes in assets and liabilities, net of effect of acquisitions:
Accounts receivable	(16,416)	(32,469)
Inventories	29,924	(7,095)
Prepaid expenses and other assets	(10,972)	(12,240)
Accounts payable	(13,128)	51,255
Accrued employee compensation	3,133	(2,063)
Other accrued liabilities	(13,767)	4,823
Deferred revenue	8,795	6,072
Income taxes payable	(661)	(2,146)
Net cash provided by operating activities	42,716	56,163
Cash flows from investing activities:
Purchases of short-term investments	(84,936)	(98,327)
Proceeds from sales and maturities of short-term investments	94,500	184,341
Purchase of property and equipment	(9,418)	(7,759)
Payments for patents	0	(275)
Payments from sale of cost method investment	0	3,890
Payments made in connection with business acquisitions	(1,050)	(144,815)
Net cash used in investing activities	(904)	(62,945)
Cash flows from financing activities:
Purchase and retirement of treasury stock	(44,622)	(483)
Proceeds from exercise of stock options	5,161	3,545
Proceeds from issuance of common stock under employee stock purchase plan	1,328	1,053
Excess tax benefit from stock-based compensation	294	569
Net cash (used in) provided by financing activities	(37,839)	4,684
Net increase (decrease) in cash and cash equivalents	3,973	(2,098)
Cash and cash equivalents, at beginning of period	143,009	149,032
Cash and cash equivalents, at end of period	$ 146,982	$ 146,934