CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 26, 2015	Sep. 27, 2014
OPERATING ACTIVITIES:
Net income	$ 3,928	$ 22,527
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8,022	5,520
Compensation for stock options and restricted stock units	3,791	3,669
Provision for (net recovery of) bad debts	462	(272)
Loss on disposal of assets	877
Write-down of inventories	9,560	3,588
Deferred income tax expense (benefit)	556	(5,804)
Income tax benefit from exercise of stock options	(292)	(137)
Decrease (increase) in:
Accounts receivable	17,205	(5,392)
Inventories	(21,693)	(16,553)
Prepaid expenses and other current assets	(5,740)	(3,032)
(Decrease) increase in:
Accounts payable and accrued liabilities	(8,779)	(805)
Customer deposits	(473)	(1,659)
Unearned service revenues	467	2,827
Net cash provided by operating activities	7,891	4,477
INVESTING ACTIVITIES:
Purchases of property and equipment	(8,462)	(10,306)
Payments for intangible assets	(1,751)	(1,080)
Purchase of businesses acquired, net of cash	(12,066)	(1,000)
Net cash used in investing activities	(22,279)	(12,386)
FINANCING ACTIVITIES:
Payments on capital leases	(6)	(6)
Income tax benefit from exercise of stock options	292	137
Proceeds from issuance of stock, net	2,286	2,522
Net cash provided by financing activities	2,572	2,653
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(1,498)	(2,464)
DECREASE IN CASH AND CASH EQUIVALENTS	(13,314)	(7,720)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	109,289	124,630
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 95,975	$ 116,910