CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 546,995	$ 224,139
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	24,960	23,313
Share-based compensation expense	162,886	157,730
Gain on sale of intangible asset	(350,000)
Amortization of debt discount and debt issue costs	5,508	9,968
Amortization of discount or premium on investments	1,866	4,195
Other	(1,528)	1,478
Excess tax benefits from share-based compensation	(31,379)	(23,183)
Changes in operating assets and liabilities:
Accounts receivable	(17,356)	(13,324)
Inventories	(7,784)	(16,870)
Accounts payable and accrued expenses	25,825	35,855
Other assets and liabilities	(2,747)	(138,647)
Net cash provided by operating activities	357,246	264,654
Cash flows from investing activities:
Purchases of property, plant and equipment	(18,256)	(45,157)
Purchases of held-to-maturity investments	(62,781)	(115,170)
Maturities of held-to-maturity investments	232,424	491,833
Gain on sale of intangible asset	350,000
Purchase of investments under the cost method, net	(54,217)	(45,000)
Net cash provided by investing activities	447,170	286,506
Cash flows from financing activities:
Principal payments of debt	(107,116)
Payments to repurchase common stock	(394,484)	(403,158)
Proceeds from line of credit		140,000
Payments on the line of credit		(140,000)
Proceeds from the exercise of stock options	33,019	39,391
Issuance of stock under employee stock purchase plan	3,954	3,329
Excess tax benefits from share-based compensation	31,379	23,183
Net cash used in financing activities	(433,248)	(337,255)
Effect of exchange rate changes on cash and cash equivalents	(3,660)	(872)
Net increase in cash and cash equivalents	367,508	213,033
Cash and cash equivalents, beginning of period	397,697	284,258
Cash and cash equivalents, end of period	765,205	497,291
Supplemental schedule of cash flow information:
Cash paid for interest	957	4,743
Cash paid for income taxes	116,906	177,683
Non-cash investing activities and financing activities:
Non-cash additions to property, plant and equipment	2,428	$ 3,298
Issuance of common stock upon conversion of convertible notes	$ 270,573