CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Operating activities:
Net income (loss)	$ 1,660	$ (5,086)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	8,720	7,707
Stock-based compensation	3,400	3,195
Provision for bad debts	211	230
Loss on disposal of assets	165	122
Provision for excess and obsolete inventory	504	736
Deferred income tax (benefit) expense	(190)	168
Decrease (increase) in:
Accounts receivable	252	4,771
Inventories	(6,664)	(10,107)
Prepaid expenses and other current assets	(3,526)	(6,489)
(Decrease) increase in:
Accounts payable and accrued liabilities	(2,901)	1,610
Income taxes payable	(4,378)	(590)
Net cash provided by (used in) operating activities	7	(4,368)
Investing activities:
Proceeds from sale of investments	0	21,000
Purchases of property and equipment	(5,164)	(3,669)
Payments for intangible assets	(1,186)	(645)
Acquisition of businesses	(3,965)	(5,496)
Equity investments and advances to affiliates	(1,786)	0
Net cash (used in) provided by investing activities	(12,101)	11,190
Financing activities:
Payments on capital leases	(46)	(4)
Proceeds from issuance of stock related to stock option exercises	7,133	284
Net cash provided by financing activities	7,087	280
Effect of exchange rate changes on cash and cash equivalents	(2,399)	4,323
(Decrease) increase in cash and cash equivalents	(7,406)	11,425
Cash and cash equivalents, beginning of period	140,960	106,169
Cash and cash equivalents, end of period	133,554	117,594
Customer deposits
(Decrease) increase in:
Customer deposits	382	(163)
Unearned service revenues	382	(163)
Current portion of unearned service revenues
(Decrease) increase in:
Customer deposits	2,372	(472)
Unearned service revenues	$ 2,372	$ (472)

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Data Type:	na
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Period Type: