Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2018	Apr. 02, 2017
Cash flows from operating activities:
Net income	$ 5,590	$ 15,994
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,887	7,866
Purchase premium amortization/discount accretion on investments, net	(107)	64
Stock-based compensation	8,150	5,128
Impairment charges on investment	1,400	0
Deferred income taxes	(631)	468
Changes in assets and liabilities
Accounts receivable	101,809	48,585
Inventories	(22,819)	(19,964)
Prepaid expenses and other assets	(3,725)	3,508
Accounts payable	(14,994)	(22,106)
Accrued employee compensation	(2,079)	(12,582)
Other accrued liabilities	(27,434)	(20,302)
Deferred revenue	2,552	(2,722)
Income taxes payable	3,397	5,324
Net cash provided by operating activities	56,996	9,261
Cash flows from investing activities:
Purchases of short-term investments	(35,166)	(33,917)
Proceeds from maturities of short-term investments	34,907	33,894
Purchases of property and equipment	(3,185)	(3,434)
Purchases of investments	0	(1,400)
Payments made in connection with business acquisition, net of cash acquired	0	(737)
Net cash used in investing activities	(3,444)	(5,594)
Cash flows from financing activities:
Repurchases of common stock	0	(11,631)
Restricted stock unit withholdings	(2,271)	(1,936)
Proceeds from exercise of stock options	1,912	2,438
Proceeds from issuance of common stock under employee stock purchase plan	2,732	2,662
Net cash provided by (used in) financing activities	2,373	(8,467)
Net increase (decrease) in cash and cash equivalents	55,925	(4,800)
Cash and cash equivalents, at beginning of period	202,870	240,468
Cash and cash equivalents, at end of period	$ 258,795	$ 235,668