Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010
Cash flows from operating activities:
Net income	$ 27,415		$ 10,123
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for (benefit of) deferred income taxes	(4,833)		212
Depreciation and amortization	7,402		5,355
Provision for (recovery of) bad debts	929		(118)
Share-based compensation	1,827		1,057
Loss on the disposition of property and equipment	82		49
Changes in operating accounts:
Accounts receivable	(2,568)		(155)
Inventories	(5,000)		(2,160)
Prepaid expenses and other current assets	(293)		920
Accounts payable	(4,777)		(1,308)
Accrued liabilities	37		1,892
Customer deposits	608		1,973
Deferred revenue	(1,106)		317
Other operating assets and liabilities	(940)		315
Net cash provided by operating activities	18,783		18,472
Cash flows from investing activities:
Purchases of property and equipment	(2,295)		(1,019)
Additions to license and patent costs	(305)		(243)
Proceeds from disposition of property and equipment			6
Cash paid for acquisitions, net of cash assumed	(44,830)		(9,086)
Net cash used in investing activities	(47,430)		(10,342)
Cash flows from financing activities:
Proceeds from issuance of common stock	62,054
Proceeds from exercise of stock options and restricted stock	2,378		262
Repayment of capital lease obligations	(172)		(159)
Restricted cash	(189)
Net cash provided by financing activities	64,071		103
Effect of exchange rate changes on cash	(156)		665
Net increase in cash and cash equivalents	35,268		8,898
Cash and cash equivalents at the beginning of the period	37,349		24,913
Cash and cash equivalents at the end of the period	72,617		33,811
Supplemental Cash Flow Information:
Interest payments	418		442
Income tax payments	994		274
Non-cash items:
Transfer of equipment from inventory to property and equipment, net(a)	2,721	[1]	1,419	[1]
Transfer of equipment to inventory from property and equipment, net(b)	779	[2]	392	[2]
Stock issued for acquisitions of businesses	$ 3,042		$ 3,915

[1] Inventory is transferred from inventory to property and equipment at cost when the Company requires additional machines for training, demonstration or short-term rentals.

[2] In general, an asset is transferred from property and equipment, net, into inventory at its net book value when the Company has identified a potential sale for a used machine. The machine is removed from inventory upon recognition of the sale.