Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income (loss)	$ 21,198us-gaap_NetIncomeLoss	$ (3,991)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	14,104	14,533
Amortization of purchased intangibles	3,093us-gaap_AmortizationOfIntangibleAssets	3,352us-gaap_AmortizationOfIntangibleAssets
Amortization of capitalized software development costs for products to be sold	685	288
Amortization of debt issuance costs	133us-gaap_AmortizationOfFinancingCosts	134us-gaap_AmortizationOfFinancingCosts
Amortization of discounts and premiums on investments, net	527	442
Write-down of excess and obsolete inventories	4,530us-gaap_InventoryWriteDown	1,781us-gaap_InventoryWriteDown
Stock-based compensation expense	9,232us-gaap_ShareBasedCompensation	5,647us-gaap_ShareBasedCompensation
Excess tax benefits from stock-based compensation expense	(3,120)	(1,695)
Loss on disposal of property and equipment	541us-gaap_GainLossOnDispositionOfAssets	3,685us-gaap_GainLossOnDispositionOfAssets
Changes in assets and liabilities:
Trade receivables	304	(870)
Inventories	1,856us-gaap_IncreaseDecreaseInInventories	(1,752)us-gaap_IncreaseDecreaseInInventories
Deferred taxes	(1,469)	(1,762)
Prepaid expenses and other assets	(4,651)	(8,623)
Accounts payable	(1,120)	6,750
Taxes payable	8,498	4,936
Other accrued liabilities and deferred revenue	(23,969)	(3,761)
Net cash provided by operating activities	30,372	19,094
Cash flows from investing activities:
Purchases of property and equipment	(11,748)	(10,929)
Capitalized software development costs for products to be sold	(606)	(1,073)
Purchases of investments	(50,669)	(90,663)
Proceeds from sales of investments	5,185	30,114
Proceeds from maturities of investments	42,796	35,430
Net cash used in investing activities	(15,042)	(37,121)
Cash flows from financing activities:
Proceeds from issuance of common stock under employee option and stock purchase plans	12,408	13,295
Payments on debt	(1,563)us-gaap_RepaymentsOfDebt	(1,562)us-gaap_RepaymentsOfDebt
Purchase and retirement of common stock under share repurchase plan	(39,993)
Purchase and retirement of common stock for tax withholdings on vesting of employee stock-based awards	(10,922)	(7,816)
Excess tax benefits from stock-based compensation expense	3,120	1,695
Net cash provided by (used in) financing activities	(36,950)	5,612
Net decrease in cash and cash equivalents	(21,620)	(12,415)
Cash and cash equivalents, beginning of period	443,132	392,629
Cash and cash equivalents, end of period	$ 421,512	$ 380,214

Increase decrease in other accrued liabilities and deferred revenue.

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

Name:	us-gaap_RepaymentsOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration