Condensed Consolidated Statements of Cash Flows (in thousands) (Unaudited) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Net income	$ 10,848	$ 25,982
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,550	5,624
Loss on disposal of property and equipment		52
Amortization and realized gain on debt instruments	357	466
Tax benefit from stock option transactions	1,907	3,105
Excess tax benefit from stock option transactions	(145)	(1,399)
Stock-based compensation	10,036	13,725
Changes in operating assets and liabilities:
Accounts receivable	1,927	(16,767)
Inventories	2,240	204
Prepaid expenses and other current assets	363	(173)
Accounts payable	712	8,918
Accrued and other long-term liabilities	(380)	1,517
Accrued income taxes payable and noncurrent tax liabilities	(1,806)	(1,709)
Accrued compensation and related benefits	(2,183)	(1,386)
Deferred rent	(7)	92
Net cash provided by operating activities	30,419	38,251
Cash flows from investing activities:
Property and equipment purchases	(18,795)	(18,572)
Purchases of short-term investments	(47,261)	(175,132)
Proceeds from sale of short-term investments	108,718	153,003
Proceeds from sale of long-term investments	3,750	250
Changes in restricted assets		(19)
Net cash provided by (used in) investing activities	46,412	(40,470)
Cash flows from financing activities:
Proceeds from issuance of common stock	4,334	13,265
Proceeds from employee stock purchase plan	1,773	1,885
Repurchase of common stock	(38,472)	(16,998)
Excess tax benefits from stock option transactions	145	1,399
Net cash used in financing activities	(32,220)	(449)
Effect of change in exchange rates	351	226
Net increase in cash and cash equivalents	44,962	(2,442)
Cash and cash equivalents, beginning of period	48,010	46,717
Cash and cash equivalents, end of period	92,972	44,275
Supplemental disclosures for cash flow information:
Cash paid for taxes	581	121
Supplemental disclosures of non-cash investing and financing activities:
Liability accrued for equipment purchases	462	1,686
Temporary impairment reversal of auction-rate securities	$ (290)	$ (220)