Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income	$ 6,428	$ 21,325
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	12,815	3,686
Amortization of net premiums and discounts on available for sale securities	203	279
Amortization of long term debt financing costs	572	58
Amortization of debt discount	4,915	519
Unrealized foreign currency transaction loss (gain), net	49	(201)
Non-cash stock compensation expense	10,460	7,295
Loss on disposal of fixed assets	26	28
Deferred tax provision	(2,631)	4,133
Excess tax benefit from share-based compensation arrangements	(5,682)	(239)
Adjustment to contingent purchase price	(5,648)	1,137
Changes in operating assets and liabilities:
Accrued interest receivable	273	74
Accounts receivable	(4,729)	8,725
Inventory	(10,482)	(2,085)
Prepaid expenses and other current assets	(739)	(950)
Accounts payable	(20,185)	780
Accrued expenses	6,668	(40,006)
Deferred revenue	(29)	1,401
Other liabilities	133	89
Net cash (used in) provided by operating activities	(7,583)	6,048
Cash flows from investing activities:
Purchases of available for sale securities	0	(65,354)
Proceeds from maturities and sales of available for sale securities	42,556	25,036
Purchases of fixed assets	(3,159)	(488)
Acquisitions, net of cash acquired	(301,700)
Acquisition of intangible assets	(10,000)	(36,678)
Other investments	(875)	0
Decrease in restricted cash	7	2,008
Net cash used in investing activities	(273,171)	(75,476)
Cash flows from financing activities:
Proceeds from issuances of common stock	49,561	10,073
Purchase of treasury stock		(50,000)
Proceeds from issuance of convertible senior notes		275,000
Proceeds from issuance of warrants		38,425
Purchase of convertible note hedge		(58,223)
Debt issuance costs		(8,774)
Excess tax benefit from stock-based compensation arrangements	5,682	239
Net cash provided by financing activities	55,243	206,740
Effect of exchange rate changes on cash	(1,044)	(354)
(Decrease) increase in cash and cash equivalents	(226,555)	136,958
Cash and cash equivalents at beginning of period	519,446	315,382
Cash and cash equivalents at end of period	292,891	452,340
Supplemental disclosure of cash flow information:
Interest paid	1,891	0
Taxes paid	$ 1,100	$ 1,019