Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Operating activities:
Net income	$ 4,874	$ 2,578
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	12,460	6,307
Cost of sales of equipment	8	4
Share-based compensation	1,421	1,425
Deferred income taxes	413	216
Loss on disposal of equipment	780
Changes in operating assets and liabilities:
Accounts receivable	3,648	(1,722)
Inventory	(4,973)	(436)
Prepaid expenses and other	(1,761)	(925)
Accounts payable	(1,002)	1,227
Accrued expenses	(2,624)	4,925
Income taxes	(1,288)	(1,120)
Deferred revenues	1,738	102
Deferred rent	23	(204)
Net cash provided by operating activities	13,717	12,377
Investing activities:
Purchases of property and equipment	(14,754)	(8,773)
Purchases of investments		(999)
Proceeds from sales of investments		10,731
Payments for acquisition	(117)	(80,475)
Net cash used in investing activities	(14,871)	(79,516)
Financing activities:
Proceeds from long-term debt		23,000
Proceeds from exercise of stock options	629	205
Stock option income tax benefit	12	12
Repurchase of common stock for treasury	(46)
Net cash provided by financing activities	595	23,217
Effect of exchange rate changes on cash	1,817	(2,553)
Net (decrease) increase in cash and cash equivalents	1,258	(46,475)
Cash and cash equivalents, beginning of period	30,343	68,979
Cash and cash equivalents, end of period	$ 31,601	$ 22,504