Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011
OPERATING ACTIVITIES:
Net income	$ 15,157	$ 13,905
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	5,164	5,047
Compensation for stock options and restricted stock units	2,956	2,042
Provision for (net recovery of) bad debts	(155)	1,620
Deferred income tax (benefit) expense	(670)	111
Decrease (increase) in:
Accounts receivable	6,398	(460)
Inventories, net	(5,998)	(23,682)
Prepaid expenses and other current assets	(1,231)	(2,707)
Income tax benefit from exercise of stock options	(1,135)	(1,412)
Increase (decrease) in:
Accounts payable and accrued liabilities	(7,307)	1,068
Income taxes payable	82	597
Customer deposits	(1,707)	(1,116)
Unearned service revenues	1,730	3,593
Net cash provided by (used in) operating activities	13,284	(1,394)
INVESTING ACTIVITIES:
Purchases of property and equipment	(3,139)	(3,370)
Payments for intangible assets	(772)	(646)
Net cash used in investing activities	(3,911)	(4,016)
FINANCING ACTIVITIES:
Payments on capital leases	(119)	(140)
Income tax benefit from exercise of stock options	1,135	1,412
Proceeds from issuance of stock, net	6,107	7,727
Net cash provided by financing activities	7,123	8,999
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(531)	34
INCREASE IN CASH AND CASH EQUIVALENTS	15,965	3,623
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	64,540	50,722
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 80,505	$ 54,345