Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating activities:
Consolidated net income (loss)	$ 6,985	$ 2,442	$ (71,021)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	63,106	51,909	36,242
Deferred income tax expense (benefit)	(11,341)	4,525	(30,967)
Amortization of debt discount	13,656	12,697	6,108
Amortization of debt issuance costs	1,680	1,872	1,816
Stock-based compensation	33,240	26,312	32,070
Impairment of goodwill and intangible assets	0	9,700	18,167
Loss on repurchase of Senior Convertible Notes, net	0	0	332
Gain recognized on change in fair value of derivatives	0	0	(2,387)
Allowance for doubtful accounts and sales return reserves	959	103	1,345
Allowance for excess and obsolete inventory, net of write-offs	6,509	5,475	6,028
Other non-cash adjustments	7,116	7,283	6,227
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	(17,384)	(2,005)	(9,929)
Inventory	(21,002)	(11,022)	(17,170)
Prepaid expenses and other current assets	(3,608)	12,725	(14,396)
Accounts payable and accrued liabilities	21,803	2,938	(3,385)
Litigation liability	(7,500)	0	101,200
Accrued payroll and related expenses	3,220	5,128	2,685
Net cash provided by operating activities	97,439	130,082	62,965
Investing activities:
Cash paid for business and asset acquisitions	(14,818)	(11,088)	(37,574)
Purchases of property and equipment	(47,597)	(41,189)	(53,370)
Purchases of marketable securities	(218,454)	(235,919)	(253,210)
Sales of marketable securities	216,299	246,504	151,966
Purchases of restricted investments	0	(113,281)	(4,536)
Sale of restricted investments	0	7,079	0
Payment for specific rights in connection with supply agreement, net of refund received	0	0	(5,000)
Net cash used in investing activities	(64,570)	(147,894)	(201,724)
Financing activities:
Proceeds from the sale of warrants	0	0	47,898
Proceeds from the issuance of convertible debt, net of issuance costs	0	0	391,445
Purchase of convertible note hedges	0	0	(80,097)
Repayments of Long-term Debt	(74,311)	0	0
Repurchase of 2013 Senior Convertible Notes	0	0	(154,164)
Tax benefits related to stock-based compensation awards	13,569	3,003	463
Proceeds from the issuance of common stock	8,422	4,884	6,852
Payment of contingent consideration	0	(29,722)	(1,800)
Other assets	(162)	(721)	(718)
Net cash (used in) provided by financing activities	(52,482)	(22,556)	209,879
Effect of exchange rate changes on cash	(861)	175	(225)
Decrease (increase) in cash and cash equivalents	(20,474)	(40,193)	70,895
Cash and cash equivalents at beginning of year	123,299	163,492	92,597
Cash and cash equivalents at end of year	102,825	123,299	163,492
Supplemental disclosure of non-cash transactions:
Issuance of common stock in connection with business and asset acquisitions	0	7,560	39,248
Acquisition of property and equipment under capital leases	325	60	1,386
Supplemental cash flow information:
Interest paid	12,035	12,741	9,466
Income taxes paid	$ 3,196	$ 2,934	$ 2,082