Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011
OPERATING ACTIVITIES:
Net income	$ 11,484	$ 7,476
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,368	3,336
Compensation for stock options and restricted stock units	1,866	1,366
Provision for (net recovery of) bad debts	(84)	1,082
Deferred income tax benefit	(744)	(16)
Decrease (increase) in:
Accounts receivable	3,535	5,920
Inventories, net	(6,173)	(14,773)
Prepaid expenses and other current assets	(1,569)	(2,032)
Income tax benefit from exercise of stock options	(1,114)	(1,013)
Increase (decrease) in:
Accounts payable and accrued liabilities	(6,313)	44
Income taxes payable	933	197
Customer deposits	317	(1,723)
Unearned service revenues	1,191	2,200
Net cash provided by operating activities	6,697	2,064
INVESTING ACTIVITIES:
Purchases of property and equipment	(2,533)	(2,534)
Payments for intangible assets	(443)	(425)
Net cash used in investing activities	(2,976)	(2,959)
FINANCING ACTIVITIES:
Payments on capital leases	(98)	(117)
Income tax benefit from exercise of stock options	1,114	1,013
Proceeds from issuance of stock, net	5,601	6,875
Net cash provided by financing activities	6,617	7,771
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(130)	(259)
INCREASE IN CASH AND CASH EQUIVALENTS	10,208	6,617
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	64,540	50,722
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 74,748	$ 57,339