Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014
Cash flows from operating activities:
Net income	$ 11,678	$ 29,116
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	18,692	17,399
Purchase premium amortization/discount accretion on investments, net	(58)	69
Non-cash stock-based compensation	8,406	10,064
Income tax impact associated with stock option exercises	(799)	(302)
Excess tax benefit from stock-based compensation	(240)	(294)
Deferred income taxes	2,220	(244)
Changes in assets and liabilities:
Accounts receivable	29,196	(16,416)
Inventories	34,215	29,924
Prepaid expenses and other assets	6,428	(10,972)
Accounts payable	(34,508)	(13,128)
Accrued employee compensation	(2,999)	3,133
Other accrued liabilities	(20,912)	(13,767)
Deferred revenue	(3,209)	8,795
Income taxes payable	(9,603)	(661)
Net cash provided by operating activities	38,507	42,716
Cash flows from investing activities:
Purchases of short-term investments	(25,105)	(84,936)
Proceeds from sales and maturities of short-term investments	65,142	94,500
Purchase of property and equipment	(8,200)	(9,418)
Payments made in connection with business acquisitions	0	1,050
Net cash provided by (used in) investing activities	31,837	(904)
Cash flows from financing activities:
Purchase and retirement of common stock	(81,036)	(44,622)
Proceeds from exercise of stock options	4,471	5,161
Proceeds from issuance of common stock under employee stock purchase plan	1,502	1,328
Excess tax benefit from stock-based compensation	240	294
Net cash used in financing activities	(74,823)	(37,839)
Net increase (decrease) in cash and cash equivalents	(4,479)	3,973
Cash and cash equivalents, at beginning of period	141,234	143,009
Cash and cash equivalents, at end of period	$ 136,755	$ 146,982