Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income	$ 14,174	$ 30,589
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	19,968	5,401
Amortization of net premiums and discounts on available for sale securities	209	513
Amortization of long term debt financing costs	872	326
Amortization of debt discount	7,434	2,908
Unrealized foreign currency transaction loss (gain), net	124	(498)
Non-cash stock compensation expense	15,910	11,132
Loss on disposal of fixed assets	32	46
Deferred tax provision	(3,390)	8,233
Excess tax benefit from share-based compensation arrangements	(5,971)	(1,052)
Adjustment to contingent purchase price	(168)	2,202
Changes in operating assets and liabilities:
Accrued interest receivable	347	(40)
Accounts receivable	(17,806)	(8,852)
Inventory	(15,098)	(17,189)
Prepaid expenses and other current assets	(2,205)	(1,334)
Accounts payable	5,970	(38)
Accrued expenses	27,409	(12,955)
Deferred revenue	1,594	1,164
Other liabilities	181	137
Net cash (used in) provided by operating activities	49,586	20,693
Cash flows from investing activities:
Purchases of available for sale securities	0	(65,354)
Proceeds from maturities and sales of available for sale securities	50,656	25,036
Purchases of fixed assets	(7,688)	(695)
Acquisitions, net of cash acquired	(402,579)	0
Acquisition of intangible assets	0	(36,678)
Other investments	(875)	(500)
Decrease in restricted cash	2	3,148
Net cash used in investing activities	(360,484)	(75,043)
Cash flows from financing activities:
Proceeds from issuances of common stock for employee benefit plan	59,169	21,606
Proceeds from equity offering, net	189,600	0
Purchase of treasury stock	0	(50,000)
Proceeds from issuance of convertible senior notes	0	275,000
Proceeds from issuance of warrants	0	38,425
Purchase of convertible note hedge	0	(58,223)
Debt issuance costs	0	(8,774)
Excess tax benefit from stock-based compensation arrangements	5,971	1,052
Net cash provided by financing activities	254,740	219,086
Effect of exchange rate changes on cash	(928)	271
(Decrease) increase in cash and cash equivalents	(57,086)	165,007
Cash and cash equivalents at beginning of period	519,446	315,382
Cash and cash equivalents at end of period	462,360	480,389
Supplemental disclosure of cash flow information:
Interest paid	1,891	0
Taxes paid	$ 2,500	$ 1,155