CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 28, 2015	Mar. 29, 2014
OPERATING ACTIVITIES:
Net income	$ 664us-gaap_NetIncomeLoss	$ 4,976us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	2,493us-gaap_DepreciationAndAmortization	1,847us-gaap_DepreciationAndAmortization
Compensation for stock options and restricted stock units	1,198us-gaap_ShareBasedCompensation	1,246us-gaap_ShareBasedCompensation
Provision for (net recovery of) bad debts	319	(120)
Write-down of inventories	1,028us-gaap_InventoryWriteDown	1,661us-gaap_InventoryWriteDown
Deferred income tax expense (benefit)	2,272	(410)
Income tax benefit from exercise of stock options	(292)	(58)
Decrease (increase) in:
Accounts receivable	18,405	1,869
Inventories	(14,221)us-gaap_IncreaseDecreaseInInventories	(4,202)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	(1,562)	(539)
(Decrease) increase in:
Accounts payable and accrued liabilities	(9,550)	(6,103)
Income taxes payable	263	(1,619)
Customer deposits	(457)	(645)
Unearned service revenues	211	1,274
Net cash provided by (used in) operating activities	771	(823)
INVESTING ACTIVITIES:
Purchases of property and equipment	(2,436)	(2,124)
Payments for intangible assets	(133)	(419)
Purchase of businesses acquired	(12,011)
Net cash used in investing activities	(14,580)	(2,543)
FINANCING ACTIVITIES:
Payments on capital leases	(2)	(50)
Income tax benefit from exercise of stock options	292	58
Proceeds from issuance of stock, net	2,019	1,619
Net cash provided by financing activities	2,309	1,627
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(1,723)	(175)
DECREASE IN CASH AND CASH EQUIVALENTS	(13,223)	(1,914)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	109,289	124,630
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 96,066	$ 122,716

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