Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net income	$ 35,681	$ 24,858
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,991	3,725
Amortization of net premiums and discounts on available for sale securities	1,503	1,596
Unrealized foreign currency transaction losses (gain), net	292	(785)
Non-cash stock compensation expense	5,474	5,080
Loss on disposal of fixed assets	0	6
Deferred tax provision	(2,089)	857
Adjustment to contingent purchase price	2,029	1,478
Changes in operating assets and liabilities:
Accrued interest receivable	384	(335)
Accounts receivable	(19,986)	8,741
Inventory	(3,569)	(2,629)
Prepaid expenses and other current assets	(3,888)	3,654
Accounts payable	8,529	(427)
Accrued expenses	9,024	(4,698)
Deferred revenue	(171)	(577)
Other liabilities	86	78
Net cash provided by operating activities	36,290	40,622
Cash flows from investing activities:
Purchases of available for sale securities	(33,835)	(65,855)
Proceeds from maturities and sales of available for sale securities	64,611	51,100
Purchases of fixed assets	(359)	(119)
Adjustment to goodwill	0	263
Increase in restricted cash	(6)	0
Net cash provided by (used in) investing activities	30,411	(14,611)
Cash flows from financing activities:
Proceeds from issuances of common stock, net	2,920	2,510
Net cash provided by financing activities	2,920	2,510
Effect of exchange rate changes on cash	(377)	950
Increase in cash and cash equivalents	69,244	29,471
Cash and cash equivalents at beginning of period	126,364	72,225
Cash and cash equivalents at end of period	195,608	101,696
Supplemental disclosure of cash flow information:
Taxes paid	$ 6,763	$ 200