Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net income	$ 105,442	$ 12,365
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	12,397	3,730
Provision for inventory reserves	22,804	4,094
Accretion of interest income on short-term investments	(158)	(171)
Deferred income taxes (benefits)	(2,800)	817
Tax impact related to the exercise of employee stock options	3	(1,632)
Deferred revenue		315
Deferred product manufacturing costs		(495)
Recognition of deferred revenue	(1,113)	(6,061)
Amortization of deferred product manufacturing costs		661
Accrued profit sharing and royalty expense	22,541	25,555
Payments of profit sharing and royalty expense	(4,925)	(40,755)
Share-based compensation expense	4,359	3,809
Other receivable	(102,049)
Changes in certain assets and liabilities:
Accounts receivable	(21,357)	34,590
Inventory	(15,130)	(7,855)
Prepaid expenses and other assets	12,561	(3,745)
Accounts payable and accrued expenses	22,645	(4,153)
Other liabilities	2,527	2,661
Net cash provided by operating activities	57,747	23,730
Cash flows from investing activities:
Purchase of short-term investments	(60,515)	(35,585)
Maturities of short-term investments	65,993	126,549
Purchases of property, plant and equipment	(9,361)	(8,165)
Payment for product licensing rights		(25,000)
Net cash (used for) provided by investing activities	(3,883)	57,799
Cash flows from financing activities:
Tax impact related to the exercise of employee stock options and restricted stock	(3)	1,632
Proceeds from exercise of stock options and ESPP	1,554	4,468
Net cash provided by financing activities	1,551	6,100
Net increase in cash and cash equivalents	55,415	87,629
Cash and cash equivalents, beginning of period	142,162	104,419
Cash and cash equivalents, end of period	197,577	192,048
Cash paid for interest	87	10
Cash paid for income taxes	$ 222	$ 1,065