CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
OPERATING ACTIVITIES:
Net income	$ 11,107	$ 12,813	$ 33,649
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	13,868	11,217	7,428
Compensation for stock options and restricted stock units	5,374	4,306	4,678
Provision for bad debts (net recovery of)	898	346	(306)
Loss on disposal of assets	860	947	0
Write-down of inventories	4,134	10,878	3,272
Deferred income tax benefit	(2,002)	(655)	(4,707)
Income tax benefit from exercise of stock options	(357)	(313)	(169)
Decrease (increase) in:
Accounts receivable, net	6,727	9,584	(24,587)
Inventories, net	(6,729)	(18,021)	(21,995)
Prepaid expenses and other assets	3,588	(2,834)	(3,501)
(Decrease) increase in:
Accounts payable and accrued liabilities	534	(6,401)	8,867
Income taxes payable	618	0	(1,560)
Customer deposits	(1,310)	1,114	(724)
Unearned service revenues	273	5,051	5,313
Net cash provided by operating activities	37,583	28,032	5,658
INVESTING ACTIVITIES:
Proceeds from sale of investments	0	22,001	0
Purchases of property and equipment	(7,720)	(14,169)	(18,722)
Payments for intangible assets	(1,657)	(2,140)	(1,221)
Acquisition of business, net of cash received	(27,708)	(12,066)	(1,150)
Net cash used in investing activities	(37,085)	(6,374)	(21,093)
FINANCING ACTIVITIES:
Payments on capital leases	(8)	(8)	(8)
Payments of contingent consideration for acquisitions	(774)	0	0
Repurchase of common stock	0	(22,763)	0
Income tax benefit from exercise of stock options	357	313	169
Proceeds from issuance of stock, net	674	2,287	3,369
Net cash provided by (used in) financing activities	249	(20,171)	3,530
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(1,934)	(3,420)	(3,436)
DECREASE IN CASH AND CASH EQUIVALENTS	(1,187)	(1,933)	(15,341)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	107,356	109,289	124,630
CASH AND CASH EQUIVALENTS, END OF YEAR	$ 106,169	$ 107,356	$ 109,289