CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 13,511	$ 10,223
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	9,472	6,673
Losses on sales and/or abandonment of property and equipment	4	280
Write-off of certain patents and trademarks	17	24
Amortization of deferred credits	(54)	(57)
Purchase of trading investments		(291)
Net unrealized losses on trading investments		76
Deferred income taxes	106	(17)
Stock-based compensation	646	606
Tax benefit attributable to appreciation of common stock options exercised	(2,854)	(49)
Changes in operating assets and liabilities, net of effects from acquisitions:
Trade receivables	(4,138)	(6,618)
Employee receivables	(39)	(11)
Other receivables	(115)	344
Inventories	(2,126)	(49)
Prepaid expenses and other assets	(1,844)	(1,282)
Income tax refunds receivable	(178)	119
Trade payables	(4,726)	345
Accrued expenses	318	1,968
Advances from employees	(125)	454
Income taxes payable	5,297	2,190
Deferred compensation payable	410	36
Other long-term assets	(391)	(25)
Other long-term obligations	416	(78)
Total adjustments	96	4,638
Net cash provided by operating activities	13,607	14,861
Capital expenditures for:
Property and equipment	(21,642)	(8,764)
Patents and trademarks	(1,351)	(545)
Proceeds from the sale of property and equipment		10
Cash paid in acquisitions	(1,500)	(500)
Net cash used in investing activities	(24,493)	(9,799)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock	94,798	379
Borrowings on line of credit		1,500
Payments on line of credit		(8,500)
Proceeds from issuance of long-term debt	18,598
Payments on long-term debt	(45,135)
Payment of taxes related to an exchange of common stock	(819)
Excess tax benefits from stock-based compensation	2,854	49
Net cash provided by (used in) financing activities	70,296	(6,572)
EFFECT OF EXCHANGE RATES ON CASH	(136)	(369)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	59,274	(1,879)
CASH AND CASH EQUIVALENTS:
Beginning of period	3,735	6,133
End of period	63,009	4,254
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION-Cash paid during the period (net capitalized interest of $240 and $0, respectively):
Interest	665	47
Income taxes	2,060	2,848
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING ACTIVITIES
Property and equipment purchases in accounts payable	5,432	1,869
Acquisition of developed technology in accrued expenses	4,000
Equity offering costs in accrued expenses	127
Company's common stock surrendered in exchange for the Company's recording of payroll tax liabilities related to the exercise of stock options (in shares)	50,142
Company's common stock surrendered in exchange for the Company's recording of payroll tax liabilities related to the exercise of stock options	819,000
Company's common stock surrendered in exchange for the exercise of stock options (in shares)	53,000
Company's common stock surrendered in exchange for the exercise of stock options	$ 913,000