Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011
Cash flows from operating activities:
Net income	$ 55,960	$ 48,372
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	10,473	9,221
Amortization	1,836	942
Stock-based compensation	6,676	5,607
Other	46	2
Income taxes payable, net	168	6,011
Deferred income taxes	(365)	(285)
(Increase) decrease, net of acquisitions, in:
Receivables	(26,315)	(18,784)
Inventories	(24,418)	(34,241)
Other assets	(5,884)	(4,775)
Increase (decrease), net of acquisitions, in:
Accounts payable	9,900	5,903
Accrued payroll liabilities	(18,060)	2,915
Accrued warranty reserves	(255)	1,320
Deferred revenue	(381)	(1,739)
Accrued restructuring, reorganization, relocation and severance	(2,212)	(2,548)
Other liabilities	1,953	965
Net cash provided by operating activities	9,122	18,886
Cash flows from investing activities:
Decrease (increase) in restricted cash	30,199	(1,771)
Acquisition of property, plant and equipment	(11,633)	(5,765)
Payments for acquisitions, net of cash acquired	30,171	0
Purchase of investments in marketable securities	(66,434)	(100,570)
Redemption of investments in marketable securities	75,950	88,313
Other	(624)	(653)
Net cash used in investing activities	(2,713)	(20,446)
Cash flows from financing activities:
Withholding taxes paid on issuance of vested restricted stock units	(1,465)	(614)
Proceeds from exercise of stock options and employee stock purchases	5,013	18,319
Excess tax benefit for share based payment arrangements	653	572
Repurchases of common stock	(890)	0
Net cash provided by financing activities	3,311	18,277
Effect of exchange rate changes	(5,836)	11,589
Increase in cash and cash equivalents	3,884	28,306
Cash and cash equivalents:
Beginning of period	320,361	277,617
End of period	324,245	305,923
Supplemental Cash Flow Information:
Cash paid for income taxes, net	20,088	7,308
Cash paid for interest	1,834	1,921
Increase in fixed assets related to transfers with inventories	11,629	1,541
Dividends declared but not paid	$ 3,046	$ 0