CONDENSED 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 (loss) income	$ (12,565)	$ 116,238
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Loss on extinguishment of convertible debt, including write-off of debt issuance costs	12,592	3,542
Depreciation and amortization	25,866	24,900
Amortization and accretion of investments	8,680	6,584
Amortization of debt discount and debt issuance costs, excluding write-off of debt issuance costs	13,382	14,740
Deferred income taxes	(23,068)	(14,012)
Stock-based compensation	24,104	19,244
Contingent consideration	7,280	6,996
Payment of contingent consideration	(24,254)	(17,408)
Premium paid for convertible subordinated debt repurchase		(26,945)
Loss on disposal of property and equipment		3,248
Other non-cash	(7,198)	7,806
Changes in assets and liabilities, net of effects from acquisitions:
Accounts receivable	(12,984)	(6,561)
Inventory	(13,370)	(5,679)
Prepaid expenses and other current assets	1,871	384
Other assets	(219)	5,754
Accounts payable and accrued liabilities	(29,669)	(28,059)
Deferred revenue and other liabilities	1,171	2,942
Total adjustments	(15,816)	(2,524)
Net cash (used in) provided by operating activities	(28,381)	113,714
Cash flows from investing activities:
Acquisition of business, net of acquired cash	(671,729)
Purchase of non-voting preferred stock	(25,000)
Purchases of property and equipment	(11,691)	(14,279)
Purchases of investments	(736,469)	(1,170,611)
Proceeds from maturities of investments	1,183,443	978,161
Payment for purchase option	(20,000)
Net cash used in investing activities	(281,446)	(206,729)
Cash flows from financing activities:
Payment of contingent consideration	(15,746)	(12,592)
Issuance of common stock, net	29,621	28,825
Excess tax benefit on stock-based awards	12,861	9,085
Extinguishment of convertible debt		(74,704)
Proceeds from issuance of convertible debt	800,000
Payment of debt issuance costs	(24,731)
Proceeds from issuance of warrants	121,675
Purchase of convertible bond hedge	(179,390)
Net cash provided by (used in) financing activities	744,290	(49,386)
Net increase (decrease) in cash and cash equivalents	434,463	(142,401)
Cash and cash equivalents at beginning of period	104,041	197,618
Cash and cash equivalents at end of period	$ 538,504	$ 55,217