Ixia (XXIA) 10-Q/A 23 Jun 14 2013 Q2 Quarterly report (amended) Financial data

Document_And_Entity_Informatio

Document And Entity Information	6 Months Ended
	Jun. 30, 2013	Jul. 30, 2013
Document and Entity Information [Abstract]	'	'
Entity Registrant Name	'Ixia	'
Document Type	'10-Q	'
Current Fiscal Year End Date	'--12-31	'
Entity Common Stock, Shares Outstanding	'	75,927,530
Amendment Flag	'true	'
Amendment Description	'As used in this Amendment No. 1 on Form 10-Q/A for the three and six months ended June 30, 2013 (the "Form 10-Q/A"), the terms "Company," "our," "us" or we" refer to Ixia, a California corporation.This Form 10-Q/A amends the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2013, as originally filed with the Securities and Exchange Commission (the "SEC") on August 9, 2013 (the "Original Filing"). This Form 10-Q/A is being filed to restate our unaudited condensed consolidated financial statements for the three and six months ended June 30, 2013 and to make related revisions to certain other disclosures in the Original Filing. The restatement of our financial statements in this Form 10-Q/A reflects the correction of certain identified errors related to revenue that affected the timing of the Company's recognition of revenue. The errors relate to (i) our inappropriate assessment of certain multiple-element arrangement sales transactions, (ii) an arrangement involving the extension of payment terms beyond our customary terms and (iii) the correction of stock-based compensation expense related to certain performance based equity awards. The restatement also includes the correction of errors related to the income tax effects of the above errors as well as the correction of certain other income tax items for the three and six months ended June 30, 2013. Further explanation regarding the restatement is set forth in Note 14 to the unaudited condensed consolidated financial statements included in this Form 10-Q/A.The following sections in the Original Filing are revised in this Form 10-Q/A to reflect this restatement: Part I - Item 1 - Financial Statements (Unaudited) Part 1 - Item 2 - Management's Discussion and Analysis of Financial Condition and Results of Operations Part I - Item 4 - Controls and Procedures Part II - Item 1A - Risk Factors Part II - Item 6 - ExhibitsOur principal executive officer and principal financial officer have also provided new certifications as required by Sections 302 and 906 of the Sarbanes-Oxley Act of 2002. The certifications are included in this Form 10-Q/A as Exhibits 31.1, 31.2 and 32.1.For the convenience of the reader, this Form 10-Q/A sets forth the information in the Original Filing in its entirety, as such information is modified and superseded where necessary to reflect the restatement and related revisions. Except as provided above, this Amendment does not reflect events occurring after the filing of the Original Filing and does not amend or otherwise update any information in the Original Filing. Accordingly, this Form 10-Q/A should be read in conjunction with the Original Filing and our filings with the SEC subsequent to the date on which we filed the Original Filing with the SEC (i.e., August 9, 2013).	'
Entity Central Index Key	'0001120295	'
Entity Current Reporting Status	'No	'
Entity Voluntary Filers	'No	'
Entity Filer Category	'Accelerated Filer	'
Entity Well-known Seasoned Issuer	'No	'
Document Period End Date	30-Jun-13	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q2	'

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Jun. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$55,690	$47,508
Short-term investments in marketable securities	178,042	126,851
Accounts receivable, net	91,378	103,523
Inventories	36,381	37,220
Prepaid expenses and other current assets	51,171	42,942
Total current assets	412,662	358,044
Investments in marketable securities	370	3,119
Property and equipment, net	32,741	28,763
Intangible assets, net	137,263	157,003
Goodwill	260,032	260,457
Other assets	13,952	11,863
Total assets	857,020	819,249
Current liabilities:	'	'
Accounts payable	15,452	12,114
Accrued expenses and other	39,373	52,525
Deferred revenues	71,669	66,096
Total current liabilities	126,494	130,735
Deferred revenues	11,036	8,695
Other liabilities	37,613	32,321
Convertible senior notes	200,000	200,000
Total liabilities	375,143	371,751
Shareholders’ equity:	'	'
Common stock, without par value; 200,000 shares authorized at June 30, 2013 and December 31, 2012; 75,922 and 74,126 shares issued and outstanding as of June 30, 2013 and December 31, 2012, respectively	172,293	158,933
Additional paid-in capital	181,235	168,980
Retained earnings	128,133	117,296
Accumulated other comprehensive income	216	2,289
Total shareholders’ equity	481,877	447,498
Total liabilities and shareholders’ equity	$857,020	$819,249

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $)	Jun. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Common stock, shares authorized	200,000	200,000
Common stock, shares issued	75,922	74,126
Common stock, shares outstanding	75,922	74,126
Common stock, without par value (in Dollars per share)	'	'

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended				6 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Revenues:	'		'		'		'
Products	$83,794,000		$73,288,000		$179,305,000		$142,895,000
Services	28,210,000		17,414,000		54,158,000		34,465,000
Total revenues	112,004,000		90,702,000		233,463,000		177,360,000
Costs and operating expenses:(1)	'		'		'		'
Cost of revenues – products (2)	21,088,000	[1]	14,220,000	[1]	42,475,000	[1]	29,002,000	[1]
Cost of revenues – services	3,311,000		2,730,000		6,336,000		4,860,000
Research and development	29,068,000		22,546,000		58,780,000		43,397,000
Sales and marketing	32,983,000		24,556,000		68,024,000		49,163,000
General and administrative	11,507,000		11,090,000		23,565,000		22,606,000
Amortization of intangible assets	10,055,000		5,358,000		20,193,000		9,403,000
Acquisition and other related	1,093,000		3,739,000		2,365,000		4,164,000
Restructuring	'		'		58,000		'
Total costs and operating expenses	109,105,000		84,239,000		221,796,000		162,595,000
Income from operations	2,899,000		6,463,000		11,667,000		14,765,000
Interest income and other, net	3,431,000		602,000		3,638,000		712,000
Interest expense	-1,943,000		-1,800,000		-3,886,000		-3,600,000
Income before income taxes	4,387,000		5,265,000		11,419,000		11,877,000
Income tax expense (benefit)	1,370,000		-20,431,000		582,000		-18,986,000
Net income	3,017,000		25,696,000		10,837,000		30,863,000
Earnings per share:	'		'		'		'
Basic (in Dollars per share)	$0.04		$0.36		$0.14		$0.43
Diluted (in Dollars per share)	$0.04		$0.32		$0.14		$0.40
Weighted average number of common and common equivalent shares outstanding:	'		'		'		'
Basic (in Shares)	75,667		71,579		75,194		71,079
Diluted (in Shares)	77,178		83,803		76,974		83,508
Cost of Revenues - Products [Member]	'		'		'		'
Costs and operating expenses:(1)	'		'		'		'
Amortization of intangible assets	$6,400,000		$3,600,000		$12,900,000		$6,300,000
[1]	Cost of revenues - products excludes amortization of intangible assets, related to product lines and purchased technologies of $6.4 million and $12.9 million for the three and six months ended June 30, 2013, respectively, and $3.6 million and $6.3 million for the three and six months ended June 30, 2012, respectively, which is included in Amortization of intangible assets.

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Operations (Unaudited) (Parentheticals) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Cost of revenues – excluded amortization of intangible assets	$10,055	$5,358	$20,193	$9,403
Cost of Revenues - Products [Member]	'	'	'	'
Stock-based compensation	128	75	281	171
Cost of revenues – excluded amortization of intangible assets	6,400	3,600	12,900	6,300
Cost of Revenues - Services [Member]	'	'	'	'
Stock-based compensation	49	29	107	66
Research and Development Expense [Member]	'	'	'	'
Stock-based compensation	1,578	945	4,026	2,224
Selling and Marketing Expense [Member]	'	'	'	'
Stock-based compensation	1,628	911	3,643	1,934
General and Administrative Expense [Member]	'	'	'	'
Stock-based compensation	$1,159	$1,809	$3,364	$3,475

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net income	$3,017	$25,696	$10,837	$30,863
Other comprehensive (loss) income, net of tax:	'	'	'	'
Net change in unrealized gains and losses on investments	-1,708	-625	-1,564	459
Cumulative translation adjustment	-186	132	-509	-165
Total other comprehensive (loss) income, net of tax	-1,894	-493	-2,073	294
Comprehensive income	$1,123	$25,203	$8,764	$31,157

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:	'	'
Net income	$10,837	$30,863
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation	7,636	7,505
Amortization of intangible assets	20,193	9,403
Realized gain on sale of available-for-sale securities	-3,169	'
Stock-based compensation	11,421	7,870
Deferred income taxes	-786	-23,363
Tax benefit from stock option transactions	833	811
Excess tax benefits from stock-based compensation	-923	-798
Accounts receivable, net	12,375	5,679
Inventories	839	-1,534
Prepaid expenses and other current assets	-8,685	1,495
Other assets	1,409	-170
Accounts payable	2,003	3,013
Accrued expenses and other	-14,415	1,125
Deferred revenues	7,914	5,097
Other liabilities	3,683	3
Net cash provided by operating activities	51,165	46,999
Purchases of property and equipment	-9,352	-8,322
Purchases of available-for-sale securities	-110,037	-110,552
Proceeds from available-for-sale securities	62,175	211,921
Purchases of other intangible assets	-453	-504
Proceeds (payments) in connection with acquisitions, net of cash acquired	401	-148,257
Net cash used in investing activities	-57,266	-55,714
Proceeds from exercise of stock options	13,360	10,584
Excess tax benefits from stock-based compensation	923	798
Net cash provided by financing activities	14,283	11,382
Net increase in cash and cash equivalents	8,182	2,667
Cash and cash equivalents at beginning of period	47,508	42,729
Cash and cash equivalents at end of period	55,690	45,396
Purchased and unpaid property and equipment	$2,768	'

Note_1_Business

Note 1 - Business	6 Months Ended
	Jun. 30, 2013
Disclosure Text Block [Abstract]	'
Nature of Operations [Text Block]	'
	1.           Business
	Ixia was incorporated on May 27, 1997 as a California corporation. We are a leading provider of converged Internet Protocol (IP) network test and network visibility solutions. Equipment manufacturers, service providers, enterprises, and government agencies use our solutions to design, verify, and monitor a broad range of Ethernet, Wi-Fi, 3G and 4G/LTE equipment and networks. Our product solutions consist of our hardware platforms, such as our chassis, interface cards and appliances, software application tools, and services, including our warranty and maintenance offerings and professional services. We operated within one reportable business segment during the periods presented in the accompanying condensed consolidated financial statements.

Note_2_Basis_of_Presentation_a

Note 2 - Basis of Presentation and Recent Accounting Pronouncements	6 Months Ended
	Jun. 30, 2013
Disclosure Text Block [Abstract]	'
Basis of Presentation and Significant Accounting Policies [Text Block]	'
	2.           Basis of Presentation and Recent Accounting Pronouncements
	Basis of Presentation
	The accompanying condensed consolidated financial statements as of June 30, 2013 and for the three and six months ended June 30, 2013 and 2012, are unaudited and reflect all adjustments (consisting only of normal recurring adjustments) which are, in the opinion of management, necessary for a fair statement of our financial position, operating results, and cash flows for the interim periods presented. The results of operations for the current interim periods presented are not necessarily indicative of results to be expected for the full year ending December 31, 2013 or any other future period.
	These condensed consolidated financial statements have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) have been condensed or omitted pursuant to such rules and regulations. The condensed consolidated balance sheet as of December 31, 2012 has been derived from our audited consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2012, as filed with the Securities Exchange Commission on April 4, 2013 (the “2012 Form 10-K”), but does not include all disclosures required by U.S. GAAP. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in our 2012 Form 10-K.
	Reclassifications
	Certain reclassifications have been made to prior period consolidated financial statements to conform to the current presentation. Income taxes payable is now presented within Accrued expenses and other on our consolidated balance sheets and consolidated statements of cash flows.
	Recent Accounting Pronouncements
	In June 2011, the FASB issued disclosure guidance related to the presentation of the Statement of Comprehensive Income. This guidance eliminated the then current option to report other comprehensive income and its components in the statement of changes in equity. Under this guidance, we are required to present either a single continuous statement of comprehensive income or a consolidated statement of operations immediately followed by a statement of comprehensive income. Although this guidance changes the presentation of comprehensive income, there are no changes to the components that are recognized in net income or other comprehensive income under the previous guidance. We adopted this guidance in the first quarter of 2012 on a retrospective basis. There was no impact to our consolidated financial results as the adoption of this guidance related only to changes in financial statement presentation. In February 2013, FASB issued finalized disclosure guidance related to the amounts reclassified from accumulated other comprehensive income. Under this guidance, we are required to show reclassifications from accumulated other comprehensive income either in a single note or parenthetically on the face of the statement of operations provided that all of the required information is presented in a single location with the effect of significant amounts reclassified by component and the statement of operations line items affected by the reclassification. The effective date for this disclosure guidance is for fiscal years beginning after December 15, 2012. We adopted this new guidance prospectively in the quarter ended March 31, 2013. The adoption of this new guidance did not have a material impact on our consolidated financial position, results of operations and cash flows.
	In July 2013, the Financial Accounting Standards Board (“FASB”) issued changes to the presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. These changes require an entity to present an unrecognized tax benefit as a liability in the financial statements if (i) a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position, or (ii) the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset to settle any additional income taxes that would result from the disallowance of a tax position. Otherwise, an unrecognized tax benefit is required to be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. Previously, there was diversity in practice as no explicit guidance existed. The effective date for this disclosure guidance is for fiscal years beginning after December 15, 2013 and is consistent with our current practices.

Note_3_Acquisitions

Note 3 - Acquisitions	6 Months Ended
	Jun. 30, 2013
Business Combinations [Abstract]	'
Business Combination Disclosure [Text Block]	'
	3.           Acquisitions
	Anue Systems, Inc.
	On June 1, 2012, we completed our acquisition of all of the outstanding shares of capital stock and other equity interests of Anue Systems, Inc. (“Anue”).  Anue provides solutions to monitor and test complex networks, including Anue’s Net Tool Optimizer solution that efficiently aggregates and filters network traffic to help optimize network monitoring tool usage.  With this acquisition, we have expanded our addressable market, broadened our product portfolio and grown our customer base.  In addition, we expect to continue to leverage Anue’s sales channels and assembled workforce, including its experienced development team.  These factors, among others, contributed to a purchase price in excess of the estimated fair value of Anue’s net identifiable assets acquired (see summary of net assets below), and, as a result, we have recorded goodwill in connection with this transaction.
	In the second quarter of 2013, we finalized our purchase price allocation. The aggregate cash consideration paid totaled $152.4 million, and was funded from our existing cash and sale of investments.
	Acquisition and other related costs, including integration activities, approximated $46,000 and $269,000 for the three and six months ended June 30, 2013, respectively, and $2.6 million and $3.0 million for the three and six months ended June 30, 2012, respectively.  These acquisition and other related costs have been expensed as incurred and have been included within the Acquisition and other related line item on our condensed consolidated statements of operations.
	The following table summarizes the allocation of the purchase price to the estimated fair values of the assets acquired and liabilities assumed at the date of acquisition (in thousands):
	Cash and cash equivalents	$	3,659
	Accounts receivable		12,016
	Inventories		4,380
	Prepaid and other assets		2,980
	Fixed assets		1,600
	Identifiable intangible assets		74,700
	Goodwill		91,008
	Total assets acquired		190,343
	Accounts payable, accrued expenses and other liabilities		(7,942	)
	Deferred revenues		(6,997	)
	Deferred tax liability, net		(22,964	)
	Net assets acquired	$	152,440
	During the second quarter of 2013, we updated the allocation of our purchase price to increase the value of our accounts receivable balance by $173,000, decrease accounts payable, accrued expenses and other liabilities by $172,000, and decrease our deferred tax liability, net by $22,000, resulting in a net decrease in goodwill of $367,000. As these changes were not material, we did not recast our prior period financial statements for such changes. The above table reflects these changes.
	The identifiable intangible assets of $74.7 million consist of $45.0 million of acquired technology, $21.9 million of customer relationships, $4.0 million for the trade name, $2.1 million related to non-compete agreements and $1.7 million of other identifiable intangible assets. The fair values of the identifiable intangible assets have been estimated using the income approach, which includes the discounted cash flow and relief-from-royalty methods. These intangible assets will be amortized using a straight-line method over their expected useful lives ranging from six months to six years.  The goodwill recorded in connection with this transaction is not deductible for U.S. income tax purposes.
	BreakingPoint Systems, Inc.
	On August 24, 2012, we completed our acquisition of all of the outstanding shares of capital stock of BreakingPoint Systems, Inc. (“BreakingPoint”).  BreakingPoint is a leader in security testing, and its solutions provide global visibility into emerging threats and applications, along with advance insight into the resiliency of an organization’s information technology infrastructure under operationally relevant conditions and malicious attacks. With this acquisition, we have expanded our addressable market, broadened our product portfolio and grown our customer base. In addition, we expect to continue to leverage BreakingPoint’s sales channels and assembled workforce, including its experienced product development and sales teams. These factors, among others, contributed to a purchase price in excess of the estimated fair value of BreakingPoint’s net identifiable assets acquired (see summary of net assets below), and, as a result, we have recorded goodwill in connection with this transaction.
	The aggregate cash consideration paid totaled $163.7 million and was funded from our existing cash and sale of investments.
	Acquisition and other related costs, including integration activities, approximated $1.0 million and $2.1 million for the three and six months ended June 30, 2013, respectively. These acquisition and other related costs have been expensed as incurred, and have been included within the Acquisition and other related line item on our condensed consolidated statements of operations.
	In connection with the acquisition, we may be obligated to pay up to $3.8 million to certain pre-acquisition employees of BreakingPoint over a weighted average period of less than two years provided they remain employees of Ixia. As of June 30, 2013, we have paid $1.7 million related to this obligation, of which $474,000 and $1.1 million have been included within the Acquisition and other related line item on our condensed consolidated statements of operations for the three and six months ended June 30, 2013, respectively. The remaining accrual was included as a component of Accrued expenses and other in our consolidated balance sheets.
	The following table summarizes the preliminary allocation of the purchase price to the estimated fair values of the assets acquired and liabilities assumed at the date of acquisition (in thousands):
	Cash and cash equivalents	$	13,417
	Accounts receivable		4,610
	Inventories		3,156
	Prepaid and other assets		796
	Fixed assets		936
	Identifiable intangible assets		65,600
	Goodwill		102,594
	Total assets acquired		191,109
	Accounts payable, accrued expenses and other liabilities		(6,889	)
	Deferred revenues		(6,387	)
	Deferred tax liability, net		(14,146	)
	Net assets acquired	$	163,687
	During 2013, we updated the preliminary allocation of our purchase price to increase the value of our accounts receivable balance by $58,000, decrease the value of our deferred tax liability balance by $264,000 and decrease goodwill by $322,000. As these changes were not material, we did not recast our prior period financial statements for such changes. The above table reflects these changes.
	The preliminary purchase price allocation is pending the completion of certain items, such as the final tax attributes that will be determined upon the filing of certain pre-acquisition tax returns.
	The identifiable intangible assets of $65.6 million consist of $22.7 million of acquired technology, $20.6 million of customer relationships, $16.6 million of service agreements, $2.9 million for the trade name, $2.2 million related to non-compete agreements and $600,000 of other identifiable intangible assets. The fair values of the identifiable intangible assets have been estimated using the income approach, which includes the discounted cash flow and relief-from-royalty methods. These intangible assets will be amortized using a straight-line method over their expected useful lives ranging from two weeks to six years.  The goodwill recorded in connection with this transaction is not deductible for U.S. income tax purposes.
	Pro Forma and Post-Acquisition Results (Unaudited)
	The following table summarizes the unaudited pro forma total revenues and net income of the combined entities, including Ixia, had the acquisitions of Anue and BreakingPoint occurred on January 1, 2011 (in thousands):
		Three Months Ended			Six Months Ended
		30-Jun-12			30-Jun-12
	Total revenues	$	116,629		$	225,458
	Net income		5,586			6,839
	The pro forma combined results in the table above have been prepared for comparative purposes only and include acquisition-related adjustments for, among others items, reductions in revenues related to the estimated fair value adjustment to deferred revenues, certain acquisition related costs, amortization of identifiable intangible assets, and the related income tax effects for these adjustments. Post-acquisition results for Anue’s operations have been included in our consolidated financial statements, which include combined revenues of $3.9 million and a combined loss before income taxes of approximately $0.8 million for both the three and six months ended June 30, 2012. The pro forma combined results, as well as those of Anue and BreakingPoint included in the Company’s results subsequent to the acquisition date, do not purport to be indicative of the results of operations which would have resulted had the acquisition been effective at the beginning of the applicable periods noted above, or of the future results of operations of the combined entity.

Note_4_Restructuring

Note 4 - Restructuring	6 Months Ended
	Jun. 30, 2013
Restructuring and Related Activities [Abstract]	'
Restructuring and Related Activities Disclosure [Text Block]	'
	4.     Restructuring
	During the third quarter of 2012, our management approved, committed to and initiated a plan to restructure our operations following our August 24, 2012 acquisition of BreakingPoint (“BreakingPoint Restructuring”). The BreakingPoint Restructuring included a net reduction in force of approximately 29 positions (primarily impacting our research and development team in Melbourne, Australia). For the year ended December 31, 2012, we recognized restructuring costs of approximately $4.1 million, and of this amount, $2.7 million primarily related to one-time employee termination benefits consisting of severance and other related costs and $1.4 million related to facility costs associated with the closure of our office in Melbourne, Australia and other costs, which were recorded to the Restructuring line item within our consolidated statement of operations. There were no restructuring activities prior to the third quarter of 2012.
	As of December 31, 2012, $1.0 million of such costs were accrued to the Accrued expenses and other line item within our consolidated balance sheets. The BreakingPoint Restructuring was substantially completed during the fourth quarter of 2012.
	As of June 30, 2013, $591,000 of such costs were accrued to the Accrued expenses and other line item within our consolidated balance sheets. These costs relate primarily to lease termination costs which are expected to be paid by the end of the second quarter of 2015.
	Activity related to our restructuring plan is as follows (in thousands):
	Accrual at December 31, 2011	$	-
	Charges		4,077
	Payments		(2,275	)
	Non-cash items		(776	)
	Accrual at December 31, 2012		1,026
	Charges		58
	Payments		(391	)
	Non-cash items		(102	)
	Accrual at June 30, 2013	$	591

Note_5_Convertible_Senior_Note

Note 5 - Convertible Senior Notes	6 Months Ended
	Jun. 30, 2013
Disclosure Text Block [Abstract]	'
Long-term Debt [Text Block]	'
	5.     Convertible Senior Notes
	On December 7, 2010, we issued $200.0 million in aggregate principal amount of 3.00% Convertible Senior Notes (the “Notes”) due December 15, 2015 unless earlier repurchased or converted. The interest is payable semi-annually on June 15 and December 15 of each year, beginning on June 15, 2011. The Notes are governed by the terms of an indenture agreement (the “Indenture”) dated December 7, 2010 between the Company and Wells Fargo Bank, National Association, as trustee.
	The Notes are convertible at any time prior to the close of business on the third business day immediately preceding the maturity date at the holder’s option, into shares of our common stock at an initial conversion rate of 51.4536 shares per $1,000 principal amount of Notes, which represents an initial conversion price of approximately $19.43 per share. The conversion rate is subject to adjustment for certain events that occur prior to maturity, such as a change in control transaction as defined in the Indenture.
	The Notes bear interest at a rate of 3.00% per year, payable semiannually in arrears on June 15 and December 15 of each year, which payments began on June 15, 2011. We may in certain instances be required to pay additional interest if the Notes are not freely tradable by the holders thereof (other than our affiliates) beginning six months after the date of issuance and in connection with events of default, including events of default relating to our failure to comply with our reporting obligations to the trustee and the SEC. After a default under the Indenture, if the trustee or the holders of at least 25% in aggregate principal amount of the Notes give us notice of, and direct us to cure, the default and the default is not cured within 60 days thereafter, then unless a waiver is obtained from the holders of more than 50% in aggregate principal amount of the Notes, an event of default will occur under the Indenture. Upon any such event of default, we may elect that for the first 180 days (or such lesser amount of time during which the event of default continues), the sole remedy be the payment of additional interest at an annual rate equal to 0.50%. In the event that such additional interest becomes payable because of our failure to timely file certain reports with the SEC and the trustee, the filing of such reports will cure the event of default and the interest rate will be reduced (so long as no other events of default then exist). If we elect to pay such additional interest and the event of default is not cured within the 180-day period, or if we do not make such an election to pay additional interest when the event of default first occurs, the trustee or the holders of at least 25% in aggregate principal amount of the Notes may declare the Notes to be due and payable immediately.
	As of June 30, 2013, the estimated fair value of our Notes was approximately $241.4 million. The fair values of the Notes were estimated using market prices of the Notes, which are based on Level 2 inputs (i.e. inputs, other than the quoted prices in active markets that are observable either directly or indirectly).
	Senior Secured Revolving Credit Facility
	On December 21, 2012, we entered into a credit agreement (the “Credit Facility Agreement”) establishing a senior secured revolving credit facility (the “Credit Facility”) with certain institutional lenders that provides for an aggregate loan amount of up to $150.0 million. The Credit Facility is expected to mature on December 21, 2016, but may mature on September 14, 2015 if we do not have available liquidity (domestic cash and investments, plus availability under the Credit Facility) of $25.0 million in excess of the amount required to repay our Notes of $200.0 million in full beginning on June 15, 2015. If we satisfy this requirement between June 15, 2015 and September 14, 2015, but fail to do so after September 15, 2015 and prior to December 15, 2015, the maturity date is the date on which the requirement is no longer satisfied.
	The Credit Facility Agreement requires the Company to comply with certain covenants, including maintaining (i) an interest coverage ratio (as defined in the Credit Facility Agreement) of greater than 3.50 to 1.00, measured quarterly on a trailing twelve months basis and (ii) a maximum leverage ratio (as defined in the Credit Facility Agreement) of not greater than 3.50 to 1.00 through June 30, 2014 and 3.00 to 1.00 thereafter, measured quarterly on a trailing twelve months basis. The Credit Facility Agreement also requires us to timely provide certain periodic financial statements to the lenders.
	The Credit Facility Agreement also provides for customary events of default (subject to grace and cure periods in certain cases) including, without limitation, (a) failure to pay (with no grace period for the nonpayment of principal); (b) defaults under other documents executed and delivered in connection with the Credit Facility agreement; (c) bankruptcy or the commencement of insolvency proceedings, including the appointment of a receiver; (d) changes of control; and (e) failure to perform or observe covenants contained in the Credit Facility Agreement or related documents, including a covenant in the Credit Facility Agreement to comply with the Indenture governing our Notes that includes our obligation to timely file with the trustee under the Indenture the periodic financial and other reports that we are required to file with the SEC. Upon the occurrence of an event of default, the principal and accrued interest under the Credit Facility then outstanding may be declared due and payable. An event of default related to certain events of bankruptcy, insolvency or reorganization with respect to the Company will automatically cause the acceleration of payment of the unpaid principal and accrued interest of all outstanding loans.

Note_6_Selected_Balance_Sheet_

Note 6 - Selected Balance Sheet Data	6 Months Ended
	Jun. 30, 2013
Disclosure Text Block Supplement [Abstract]	'
Supplemental Balance Sheet Disclosures [Text Block]	'
	6.            Selected Balance Sheet Data
	Investments in Marketable Securities
	Investments in marketable securities as of June 30, 2013 consisted of the following (in thousands):
		Amortized		Gross Unrealized		Gross Unrealized			Fair
		Cost		Gains		Losses			Value
	Available-for-sale – short-term:
	U.S. Treasury, government and agency debt securities	$	86,606	$	21	$	(46	)	$	86,581
	Corporate debt securities		90,638		1,056		(233	)		91,461
			177,244		1,077		(279	)		178,042
	Available-for-sale – long-term:
	Auction rate securities		369		1		—			370
			369		1		—			370
	Total	$	177,613	$	1,078	$	(279	)	$	178,412
	Investments in marketable securities as of December 31, 2012 consisted of the following (in thousands):
		Amortized		Gross Unrealized		Gross Unrealized			Fair
		Cost		Gains		Losses			Value
	Available-for-sale – short-term:
	U.S. Treasury, government and agency debt securities	$	77,823	$	48	$	(1	)	$	77,870
	Corporate debt securities		47,933		1,068		(20	)		48,981
			125,756		1,116		(21	)		126,851
	Available-for-sale – long-term:
	Auction rate securities		820		2,301		(2	)		3,119
			820		2,301		(2	)		3,119
	Total	$	126,576	$	3,417	$	(23	)	$	129,970
	As of June 30, 2013 and December 31, 2012, our available-for-sale securities had a weighted remaining contractual maturity of 1.56 and 1.36 years, respectively. For the three and six months ended June 30, 2013, gross realized gains and gross realized losses were $3.2 million and $0, respectively. For the three and six months ended June 30, 2012, gross realized gains and gross realized losses were not significant. As of June 30, 2013, our gross unrealized losses of $279,000 were in an unrealized loss position for less than 12 months.
	The amortized cost and fair value of our investments at June 30, 2013, by contractual years-to-maturity, are as follows (in thousands):
		Amortized Cost		Fair Value
	Due in less than 1 year	$	38,159	$	38,206
	Due within 1-2 years		86,642		86,658
	Due within 2-5 years		51,300		51,119
	Due after 5 years		1,512		2,429
	Total	$	177,613	$	178,412
	Accounts receivable, net
	Accounts receivable, net included an allowance for doubtful accounts of $1.3 million and $1.4 million as of June 30, 2013 and December 31, 2012, respectively.
	Inventories
	Inventories consist of the following (in thousands):
		June 30,		December 31,
		2013		2012
	Raw materials	$	2,909	$	4,530
	Work in process		18,143		14,144
	Finished goods		15,329		18,546
		$	36,381	$	37,220
	Accrued expenses and other
	As of June 30, 2013 and December 31, 2012, accrued vacation totaled $8.3 million and $7.6 million, respectively.

Note_7_Goodwill_and_Other_Inta

Note 7 - Goodwill and Other Intangible Assets	6 Months Ended
	Jun. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Intangible Assets Disclosure [Text Block]	'
	7.           Goodwill and Other Intangible Assets
	The following table presents the 2012 and 2013 activity for our goodwill (in thousands):
	Balance at January 1, 2012:	$	66,429
	Acquisition of Anue		91,376
	Acquisition of BreakingPoint		102,652
	Balance at December 31, 2012:	$	260,457
	Anue Acquisition		(367	)
	BreakingPoint Acquisition		(58	)
	Balance at June 30, 2013	$	260,032
	We have not had any historical goodwill impairment charges.
	The following table presents our purchased intangible assets (in thousands) as of June 30, 2013:
		Weighted
		Average
		Useful Life			Gross		Accumulated			Net
		(in years)					Amortization
	Other intangible assets:
	Technology		5.4		$	141,215	$	(77,655	)	$	63,560
	Customer relationships		6			70,376		(24,071	)		46,305
	Service agreements		5.7			22,700		(7,265	)		15,435
	Non-compete agreements		4.2			5,700		(2,207	)		3,493
	Trademark		5.3			8,976		(3,016	)		5,960
	Other		4			3,869		(1,359	)		2,510
					$	252,836	$	(115,573	)	$	137,263
	The following table presents our purchased intangible assets (in thousands) as of December 31, 2012:
		Weighted
		Average
		Useful Life			Gross		Accumulated			Net
		(in years)					Amortization
	Other intangible assets:
	Technology		5.4		$	141,215	$	(66,704	)	$	74,511
	Customer relationships		6			70,376		(18,289	)		52,087
	Service agreements		5.7			22,700		(5,272	)		17,428
	Non-compete agreements		4.2			5,700		(1,520	)		4,180
	Trademark		5.3			8,976		(2,333	)		6,643
	Other		3.8			3,416		(1,262	)		2,154
					$	252,383	$	(95,380	)	$	157,003
	The estimated future amortization expense of purchased intangible assets as of June 30, 2013 is as follows (in thousands):
	2013	$	19,668
	2014		33,928
	2015		29,251
	2016		25,898
	2017		18,853
	Thereafter		9,665
		$	137,263

Note_8_Shareholders_Equity

Note 8 - Shareholders' Equity	6 Months Ended
	Jun. 30, 2013
Stockholders' Equity Note [Abstract]	'
Stockholders' Equity Note Disclosure [Text Block]	'
	8.            Shareholders’ Equity
	Accumulated Other Comprehensive Income
	We sold available-for-sale securities in the three and six months ended June 30, 2013, which resulted in a gross reclassification from accumulated other comprehensive income for realized gains of $3.1 million and $3.2 million, respectively, which were included within our interest income and other, net line item on our condensed consolidated statements of operations. These realized gains, along with the related tax impact of $1.2 million, for both the three and six months ended June 30, 2013, were reclassified from accumulated other comprehensive income. Prior to the reclassification for the sale of available-for-sale securities, we had a net unrealized gain during the periods of $286,000 and $517,000 for the three and six months ended June 30, 2013, respectively. The tax impact for these unrealized gains and losses was a benefit of $80,000 and $145,000 for the three and six months ended June 30, 2013, respectively.
	Stock Award Plans
	In June 2013, our shareholders approved our Second Amended and Restated Ixia 2008 Equity Incentive Plan (the “Plan”), which resulted in amendments to the Company’s Amended and Restated Ixia 2008 Equity Incentive Plan, as amended, that include the following:
		●	Increase in Share Reserve. Increased the total number of shares of our common stock available for future grants by 9.8 million shares for a total of 29.0 million shares of our common stock authorized and reserved over the term of the Plan, of which 13.3 million shares were available for future grant as of such date.
		●	Types of Awards. Added cash awards to the types of awards that may be granted under the Plan, including performance-based incentives that are intended to comply with Section 162(m) of the Internal Revenue Code of 1986, as amended (the “Code”).
		●	Award Limits. Added (i) a limit on the total number of shares (i.e., 1,000,000) subject to options and share appreciation rights granted to an eligible participant in any calendar year, (ii) with respect to performance-based awards that are intended to comply with the exception under Section 162(m) of the Code, limits on the total number of shares (i.e., 1,000,000) subject to restricted stock unit and restricted stock awards that an individual may earn over a 12-month period and on the total dollar amount (i.e., $2,000,000) subject to cash awards that an individual may earn over a 12-month period, and (iii) a limit (i.e., $500,000) on the total dollar value of equity and cash awards that may be granted to a non-employee director in any calendar year.
	The Plan also provides for the following:
		●	Shares Not Available for Awards. None of the following will be added to the shares available for awards under the Plan: (i) shares tendered by a participant or withheld by the Company in payment of the exercise price of an option, or to satisfy any tax withholding obligation with respect to options, and (ii) shares reacquired by the Company on the open market using cash proceeds from the exercise of options.
		●	Acquisitions and Combinations. In connection with acquisitions and combinations by us, we may grant under the Plan awards in substitution or exchange for awards or rights to future awards previously granted by the acquired or combined company without reducing the shares available under the Plan. Any shares subject to but not issued under any such substitute awards would not become available for other awards granted under the Plan. Also, in the event that a company acquired by us or with which we combine has a pre-existing plan approved by its shareholders that was not adopted in contemplation of the acquisition or combination, available shares under that plan may be used for Plan awards without reducing the shares available under the Plan. Any such awards may only be made to persons who were not eligible to receive awards under the Plan prior to the acquisition or combination and may not be made after the date that awards could have been made under the terms of the pre-existing plan.
	Share Cancellation
	Certain of the Company’s performance-based equity awards include a forfeiture provision that provides for the forfeiture of the unvested portion of such equity awards in the event that the Company concludes that it is required to restate its previously issued financial statements to reflect a less favorable financial condition and/or less favorable results of operations. On April 2, 2013, the Company concluded to restate certain previously issued unaudited condensed consolidated financial statements, and, due to such forfeiture provisions, we have for accounting purposes deemed such equity awards to have been automatically forfeited and subsequently re-granted. The Company did not reflect any such forfeiture or subsequent re-grant of these equity awards in its previously issued unaudited condensed consolidated financial statements. The correction of this error resulted in a reversal of stock-based compensation expenses for the deemed cancellation of $4.0 million for the quarter ended June 30, 2013 and additional stock-based compensation expenses for the deemed re-grant of $2.8 million for the three and six months ended June 30, 2013. See further discussion on the restatement in Note 14 of the Notes to the condensed consolidated financial statements.
	Employee Stock Purchase Plan
	In May 2013, the number of shares authorized and reserved for issuance under our 2010 Employee Stock Purchase Plan, as amended (the “Purchase Plan”) was increased by an additional 500,000 shares pursuant to the automatic annual increase provision of the Purchase Plan. In June 2013, our shareholders approved a 2,000,000-share increase in the number of shares of our common stock authorized and reserved for issuance under the Purchase Plan.

Note_9_Earnings_Per_Share

Note 9 - Earnings Per Share	6 Months Ended
	Jun. 30, 2013
Earnings per share: [Abstract]	'
Earnings Per Share [Text Block]	'
	9.             Earnings Per Share
	The following table sets forth the computation of basic and diluted earnings per share for the three months and six months ended June 30, 2013 and 2012 (in thousands, except per share data):
		Three months ended				Six months ended
		June 30,				June 30,
		2013		2012		2013		2012
	Basic presentation:
	Numerator for basic earnings per share:
	Net income	$	3,017	$	25,696	$	10,837	$	30,863
	Denominator for basic earnings per share:
	Weighted average common shares outstanding		75,667		71,579		75,194		71,079
	Basic earnings per share	$	0.04	$	0.36	$	0.14	$	0.43
	Diluted presentation:
	Numerator for diluted earnings per share:
	Net income	$	3,017	$	25,696	$	10,837	$	30,863
	Interest expense on convertible senior notes, net of tax		—		1,100		—		2,200
	Net income used for diluted earnings per share	$	3,017	$	26,796	$	10,837	$	33,063
	Denominator for dilutive earnings per share:
	Weighted average common shares outstanding		75,667		71,579		75,194		71,079
	Effect of dilutive securities:
	Stock options and other share-based awards		1,511		1,934		1,780		2,139
	Convertible senior notes		—		10,290		—		10,290
	Dilutive potential common shares		77,178		83,803		76,974		83,508
	Diluted earnings per share	$	0.04	$	0.32	$	0.14	$	0.4
	The diluted earnings per share computation for the three and six months ended June 30, 2013 excludes (i) the weighted average number of shares underlying our outstanding Notes of 10.3 million shares as such shares are considered anti-dilutive because the related interest expense on a per common share “if converted” basis exceeds basic earnings per share and (ii) the weighted average number of shares underlying our employee stock options and other share-based awards of 2.2 million shares and 1.3 million shares, respectively, which were anti-dilutive because, in general, the exercise price of these awards exceeded the average closing sales price per share of our common stock during the applicable period.
	The diluted earnings per share computation for the three and six months ended June 30, 2012 excludes the weighted average number of shares underlying our employee stock options and other share-based awards of 1.7 million shares and 1.6 million shares, respectively, which were anti-dilutive because, in general, the exercise price of these awards exceeded the average closing sales price per share of our common stock during the applicable period.

Note_10_Concentrations

Note 10 - Concentrations	6 Months Ended
	Jun. 30, 2013
Risks and Uncertainties [Abstract]	'
Concentration Risk Disclosure [Text Block]	'
	10.          Concentrations
	Significant Customers
	The following customers accounted for more than 10% of total revenue for the three and six months ended June 30, 2013, in the case of Customer A, and for the three and six months ended June 30, 2013 and 2012, in the case of Customer B:
		Three months ended						Six months ended
		June 30,						June 30,
		2013			2012			2013			2012
	Customer A		15.7	%		*			17.2	%		*
	Customer B		*			14.9	%		10.4	%		16	%
	* Less than 10%
	As of June 30, 2013 and December 31, 2012, the percentage of total receivables for Customers A and B above were as follows:
		June 30,			December 31,
		2013			2012
	Customer A		10	%		*
	Customer B		10.6	%		*
	* Less than 10%
	International Data
	For the three and six months ended June 30, 2013 and 2012, the percentage of total international revenues based on customer location consisted of the following:
		Three months ended						Six months ended
		June 30,						June 30,
		2013			2012			2013			2012
	International revenues		33.7	%		44.5	%		35.8	%		46.7	%
	Within international revenues disclosed above, the percentage of total revenues from product shipments to Japan for the three and six months ended June 30, 2013 and 2012 were as follows:
		Three months ended						Six months ended
		June 30,						June 30,
		2013			2012			2013			2012
	Japan		*			14.4	%		*			14.2	%
	* Less than 10%

Note_11_Fair_Value_Measurement

Note 11 - Fair Value Measurements	6 Months Ended
	Jun. 30, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Disclosures [Text Block]	'
	11.          Fair Value Measurements
	Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market for an asset or liability in an orderly transaction between market participants at the measurement date.  The hierarchy below lists three levels of fair value based on the extent to which inputs used in measuring fair value are observable in the market. We categorize each of our fair value measurements in one of these three levels based on the lowest level input that is significant to the fair value measurement in its entirety. This hierarchy prioritizes the inputs into three broad levels as follows:
	Level 1.	Observable inputs such as quoted prices in active markets;
	Level 2.	Inputs, other than quoted prices in active markets, that are observable either directly or indirectly; and
	Level 3.	Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.
	Financial assets carried at fair value as of June 30, 2013 and December 31, 2012 are classified in the table below in one of the three categories described above (in thousands):
			30-Jun-13											December 31, 2012
			Fair Value			Quoted			Significant			Significant		Fair Value		Quoted		Significant		Significant
						Prices in			Other			Unobservable				Prices in		Other		Unobservable
						Active			Observable			Inputs				Active		Observable		Inputs
						Markets for			Inputs			(Level 3)				Markets for		Inputs		(Level 3)
						Identical			(Level 2)							Identical		(Level 2)
						Assets										Assets
						(Level 1)										(Level 1)
	Cash equivalents:
	Money market funds		$	251		$	251		$	—		$	—	$	185	$	185	$	—	$	—
	Corporate debt securities			29,139			—			29,139			—		—		—		—		—
	Short-term investments:
	U.S. Treasury, government and agency debt securities			86,581			—			86,581			—		77,870		—		77,870		—
	Corporate debt securities			91,461			—			91,461			—		48,981		—		48,981		—
	Long-term investments:
	Auction rate securities			370			—			—			370		3,119		—		—		3,119
	Total financial assets		$	207,802		$	251		$	207,181		$	370	$	130,155	$	185	$	126,851	$	3,119
	To estimate the fair value of our money market funds, U.S. treasury, government and agency debt securities, corporate debt securities and auction rate securities, we use the estimated fair value per our investment brokerage/custodial statements. To the extent deemed necessary, we may also obtain non-binding market quotes to corroborate the estimated fair values reflected in our investment brokerage/custodial statements.
	During the second quarter of 2013, we sold an auction rate security that was classified as a Level 3 financial asset.  This auction rate security had a par value of $4.0 million and the sale resulted in a realized gain of $2.9 million (included within our Interest income and other, net line item on our condensed consolidated statements of operations.)
	There were no transfers of assets between levels within the fair value hierarchy for the three and six months ended June 30, 2013.
	The following table summarizes the activity for the three and six months ended June 30, 2013 and 2012 for our auction rate securities where fair value measurements are estimated utilizing Level 3 inputs (in thousands):
			Three months ended						Six months ended
			June 30,						June 30,
			2013			2012			2013			2012
	Beginning balance		$	3,167		$	2,954		$	3,119		$	2,774
	Unrealized (loss) gain reclassified from/recorded in other comprehensive income			(2,346	)		(119	)		(2,298	)		61
	Realized gain recorded in earnings			2,869			—			2,869			—
	Sales			(3,320	)		—			(3,320	)		—
	Ending balance		$	370		$	2,835		$	370		$	2,835
	There were no unrealized losses recorded in earnings for Level 3 assets still held at June 30, 2013.

Note_12_Commitments_and_Contin

Note 12 - Commitments and Contingencies	6 Months Ended
	Jun. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies Disclosure [Text Block]	'
	12.          Commitments and Contingencies
	Litigation
	On June 15, 2012, Catapult, our wholly owned subsidiary, issued a demand for indemnification to Tekelec pursuant to the Asset Purchase Agreement between Tekelec and Catapult dated July 15, 2002 (the “APA”) under which Catapult had succeeded to Tekelec’s relationship with Tucana, a former distributor of Catapult.  Catapult demanded indemnification for the full amount of Catapult’s costs, including attorneys’ fees and expenses, incurred in defending against and resolving Tucana’s claims.
	Because Catapult’s demand for indemnification was not resolved within the 30-day period provided for by the APA, on July 16, 2012, Catapult demanded arbitration of its indemnification claim against Tekelec. The arbitration hearing took place before three arbitrators in January 2013.  The arbitrators issued their final award on January 31, 2013 granting Catapult its full indemnity claim against Tekelec in the amount of approximately $1.2 million. The $1.2 million of proceeds were received in the first quarter of 2013 and were reflected in our results of operations as a component of the General and administrative line item on our condensed consolidated statements of operations.
	We are not aware of any pending legal proceedings that, individually or in the aggregate, could have a material adverse effect on our business, results of operations, cash flows or financial position. We may in the future be a party to litigation arising in the ordinary course of business, including claims that we allegedly infringe upon third party patents or other intellectual property rights. Such claims, even if without merit, could result in the expenditure of significant financial and managerial resources.

Note_13_Income_Taxes

Note 13 - Income Taxes	6 Months Ended
	Jun. 30, 2013
Income Tax Disclosure [Abstract]	'
Income Tax Disclosure [Text Block]	'
	13.          Income Taxes
	As of June 30, 2013 and December 31, 2012, current deferred tax assets totaled $24.1 million and $24.2 million, respectively, and were included within the Prepaid expenses & other current assets line item in our condensed consolidated balance sheets.

Note_14_Restatement

Note 14 - Restatement	6 Months Ended
	Jun. 30, 2013
Accounting Changes and Error Corrections [Abstract]	'
Accounting Changes and Error Corrections [Text Block]	'
	14.          Restatement
	Quarterly financial statements as of and for the three and six months ended June 30, 2013
	Subsequent to the initial filing of the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2013, we have restated herein our unaudited interim condensed consolidated financial statements as of and for the three and six months ended June 30, 2013 to reflect certain corrections in the manner in which we recognize revenue related to certain sales transactions. The errors identified by the Company in its revenue recognition practices are described below:
		●	For certain sales transactions, the Company entered into an extended maintenance and warranty arrangement that included a fixed fee to cover products owned by the customer at the date of execution of the arrangement as well as extended maintenance and warranty coverage on any additional products purchased by the customers over the multi-year term of the applicable arrangement.  The Company did not properly defer revenues on the additional product purchases to correctly account for the fixed fee, multi-year extended maintenance and warranty arrangement.  As a result, the Company improperly recognized product revenues when the additional products were shipped rather than deferring a portion of the consideration and recognizing the related revenues over the remaining term of the applicable fixed fee, multi-year extended maintenance and warranty arrangement.
		●	For certain other sales transactions, the Company (i) recognized product revenues prematurely in advance of delivering certain product functionality or other deliverables that were committed to be provided to the customers or (ii) recognized product revenues prematurely based on an incorrect assessment of certain multiple-element arrangement sales transactions that included professional services that were provided based on a purchase order that was separate from the product purchase order but that was negotiated concurrently with the customer.
		●	The Company entered into a sales arrangement that included extended payment terms beyond the Company’s customary terms.  Revenue for this transaction should have been, but was not, recognized when the payments became due, as opposed to when the products were shipped.
	These corrections in our revenue recognition resulted in the movement of revenue between accounting periods, and do not have any impact on the total revenue to be recognized over the life of the applicable arrangements.
	Certain of the Company’s performance-based equity awards include a forfeiture provision that provides for the forfeiture of the unvested portion of such equity awards in the event that the Company concludes that it is required to restate its previously issued financial statements to reflect a less favorable financial condition and/or less favorable results of operations. On April 2, 2013, the Company concluded to restate certain previously issued unaudited condensed consolidated financial statements,and, due to such forfeiture provisions, we have for accounting purposes deemed such equity awards to have been automatically forfeited and subsequently re-granted as a result of the restatement. The Company did not reflect any such forfeiture or subsequent re-grant of these equity awards in its previously issued unaudited condensed consolidated financial statements. The correction of this error resulted in a net reduction in our stock-based compensation expenses with a pre-tax impact of $1.2 million for the three and six months ended June 30, 2013.
	The previously filed interim condensed consolidated financial statements as of and for the three months and six months ended June 30, 2013 have been restated to reflect the correction of these errors, which impact revenue from products, revenue from services, research and development expenses, sales and marketing expenses, general and administrative expenses, and deferred revenue (current and non-current). All other adjustments relate to the applicable income tax effects of these errors as well as the correction of certain other income tax errors which existed as of June 30, 2013 as shown in the following table:
	Restated condensed consolidated balance sheet amounts
			As of June 30, 2013
			As Previously			Restatement
			Reported			Adjustments			Restated
			(in thousands)
	Prepaid expenses and other current assets		$	46,657		$	4,514		$	51,171
	Total current assets			408,148			4,514			412,662
	Other assets			10,221			3,731			13,952
	Total assets			848,775			8,245			857,020
	Deferred revenues - current			67,195			4,474			71,669
	Total current liabilities			122,020			4,474			126,494
	Deferred revenues - non-current			10,295			741			11,036
	Other liabilities			32,353			5,260			37,613
	Total liabilities			364,668			10,475			375,143
	Additional paid-in capital			182,434			(1,199	)		181,235
	Retained earnings			129,164			(1,031	)		128,133
	Total shareholders’ equity			484,107			(2,230	)		481,877
	Total liabilities and shareholders’ equity		$	848,775		$	8,245		$	857,020
	Restated condensed consolidated statements of operations amounts
			For the Three Months Ended June 30, 2013
			As Previously			Restatement
			Reported			Adjustments			Restated
			(in thousands, except per share data)
	Revenues:
	Products		$	87,818		$	(4,024	)	$	83,794
	Services			28,077			133			28,210
	Total revenues			115,895			(3,891	)		112,004
	Costs and operating expenses:
	Research and development			29,539			(471	)		29,068
	Sales and marketing			33,191			(208	)		32,983
	General and administrative			12,027			(520	)		11,507
	Total costs and operating expenses			110,304			(1,199	)		109,105
	Income from operations			5,591			(2,692	)		2,899
	Income before income taxes			7,079			(2,692	)		4,387
	Income tax expense			3,316			(1,946	)		1,370
	Net income			3,763			(746	)		3,017
	Earnings per share:
	Basic		$	0.05		$	(0.01	)	$	0.04
	Diluted		$	0.05		$	(0.01	)	$	0.04
	Stock-based compensation included in:
	Research and development		$	2,049		$	(471	)	$	1,578
	Sales and marketing			1,836			(208	)		1,628
	General and administrative			1,679			(520	)		1,159
			For the Six Months Ended June 30, 2013
			As Previously			Restatement
			Reported			Adjustments			Restated
			(in thousands, except per share data)
	Revenues:
	Products		$	184,454		$	(5,149	)	$	179,305
	Services			54,224			(66	)		54,158
	Total revenues			238,678			(5,215	)		233,463
	Costs and operating expenses:
	Research and development			59,251			(471	)		58,780
	Sales and marketing			68,232			(208	)		68,024
General and administrative			24,085			(520	)		23,565
Total costs and operating expenses			222,995			(1,199	)		221,796
Income from operations			15,683			(4,016	)		11,667
Income before income taxes			15,435			(4,016	)		11,419
Income tax expense			3,567			(2,985	)		582
Net income			11,868			(1,031	)		10,837
Earnings per share:
Basic		$	0.16		$	(0.02	)	$	0.14
Diluted		$	0.15		$	(0.01	)	$	0.14
Stock-based compensation included in:
Research and development		$	4,497		$	(471	)	$	4,026
Sales and marketing			3,851			(208	)		3,643
General and administrative			3,884			(520	)		3,364
Restated condensed consolidated statements of comprehensive income amounts
		For the Three Months Ended June 30, 2013
		As Previously			Restatement
		Reported			Adjustments			Restated
		(in thousands)
Net Income		$	3,763		$	(746	)	$	3,017
Comprehensive Income		$	1,869		$	(746	)	$	1,123
		For the Six Months Ended June 30, 2013
		As Previously			Restatement
		Reported			Adjustments			Restated
		(in thousands)
Net Income		$	11,868		$	(1,031	)	$	10,837
Comprehensive Income		$	9,795		$	(1,031	)	$	8,764
Restated condensed consolidated statements of cash flows amounts
The correction of the errors described above did not impact our total cash flows from operating activities, investing activities or financing activities within our consolidated statement of cash flows, but did result in corrections of the following line items within cash flows from operating activities:
		For the Six Months Ended June 30, 2013
		As Previously			Restatement
		Reported			Adjustments			Restated
		(in thousands)
Net Income		$	11,868		$	(1,031	)	$	10,837
Stock-based compensation			12,621			(1,200	)		11,421
Deferred Income Taxes			(1,649	)		863			(786	)
Prepaid Expenses and Other current Assets			(4,172	)		(4,513	)		(8,685	)
Other Assets			(282	)		1,691			1,409
Deferred Revenues			2,699			5,215			7,914
Other Liabilities			4,708			(1,025	)		3,683
Quarterly financial statements as of and for the three and six months ended June 30, 2012
In our 2012 Form 10-K, we restated, among other previously issued financial statements, our unaudited consolidated financial statements for the three and six months ended June 30, 2012 to reflect certain corrections in the manner in which we recognized revenue related to our warranty and software maintenance contracts, including a previous implied warranty and software maintenance arrangement with one of our customers. Specifically, we made the following two corrections to our revenue recognition practices to properly report revenue in prior periods:
	●	Accounting Practice Error - We now recognize revenue related to our warranty and software maintenance contracts on the effective date of each such contract rather than in the first calendar month following the effective date of the contract as though the warranty and maintenance period commenced on the first day of such month. We also now recognize revenue related to back maintenance fees when evidence of an arrangement exists rather than commencing in the first calendar month following the effective date of the contract as though the warranty and maintenance period commenced on the first day of such month.
	●	Implied Arrangement Error - We now cease to defer revenue for any implied warranty and software maintenance arrangement upon the receipt from the applicable customer of the first substantive contract for extended warranty and software maintenance services, and we will recognize the applicable previously deferred revenue related to the implied arrangement, provided all other revenue recognition criteria have been met. The Company’s historical practice was to continue to defer revenue for implied warranty and software maintenance arrangements (despite the receipt of an initial substantive extended warranty and software maintenance contract) until we could establish a pattern that we were able to enforce our warranty and software maintenance contracts as evidenced by, among other items, (i) the consistent receipt of extended renewal orders from the specific customer for warranty and software maintenance services and (ii) senior management’s assertion that warranty and software maintenance services would not be provided to the customer if existing contracts were canceled or were not renewed.
The 2012 changes in our revenue recognition practices resulted in movements of revenue between accounting periods, and do not have any impact on the total revenue to be recognized over the life of a warranty and software maintenance contract or arrangement, although the timing of the recognition of such revenue commences earlier and ends earlier than would be the case under the Company’s previously used accounting treatment.
This Quarterly Report on Form 10-Q/A for the quarter ended June 30, 2013 (this “Form 10-Q/A”) reflects the impact of the prior restatement on the applicable unaudited quarterly financial information for the three and six months ended June 30, 2012. Our previously filed Quarterly Report on Form 10-Q for the quarter ended June 30, 2012 has not been and will not be amended.
Certain line items included in this Form 10-Q/A have been restated to reflect the corrections of the above errors, which impact revenues from products, revenues from services and deferred revenues (current and non-current). All other adjustments related to the applicable income tax effects of these errors. The following tables reconcile the amounts as originally reported in our Quarterly Report on Form 10-Q for the quarter ended June 30, 2012 to the corresponding amounts as restated and included in Note 15, Restatement, in our 2012 Form 10-K and as reported herein.
Restated consolidated statement of operations amounts
		For the Three Months Ended
		30-Jun-12
		As			Restatement
		Previously
		Reported			Adjustments			Restated
		(in thousands, except per share data)
Revenues:
Products
Implied arrangement error		$	—		$	(2,650	)	$	—
			75,938			(2,650	)		73,288
Services
Accounting practice error			—			340			—
Implied arrangement error			—			669			—
			16,405			1,009			17,414
Total revenues			92,343			(1,641	)		90,702
Income from operations			8,104			(1,641	)		6,463
Income before income taxes			6,906			(1,641	)		5,265
Income tax benefit			(19,944	)		(487	)		(20,431	)
Net income			26,850			(1,154	)		25,696
Earnings per share:
Basic		$	0.38		$	(0.02	)	$	0.36
Diluted		$	0.33		$	(0.01	)	$	0.32
		For the Six Months Ended
		30-Jun-12
		As			Restatement
		Previously
		Reported			Adjustments			Restated
		(in thousands, except per share data)
Revenues:
Products
Implied arrangement error		$	—		$	(2,086	)	$	—
			144,981			(2,086	)		142,895
Services
Accounting practice error			—			1,028			—
Implied arrangement error			—			432			—
			33,005			1,460			34,465
Total revenues			177,986			(626	)		177,360
Income from operations			15,391			(626	)		14,765
Income before income taxes			12,503			(626	)		11,877
Income tax benefit			(18,729	)		(257	)		(18,986	)
Net income			31,232			(369	)		30,863
Earnings per share:
Basic		$	0.44		$	(0.01	)	$	0.43
Diluted		$	0.4		$	—		$	0.4
Restated consolidated statements of comprehensive income amounts
		For the Three Months Ended
		30-Jun-12
		As			Restatement			Restated
		Previously			Adjustments
		Reported
		(in thousands)
Net income		$	26,850		$	(1,154	)	$	25,696
Comprehensive income		$	26,357		$	(1,154	)	$	25,203
		For the Six Months Ended
		30-Jun-12
		As			Restatement			Restated
		Previously			Adjustments
		Reported
		(in thousands)
Net income		$	31,232		$	(369	)	$	30,863
Comprehensive income		$	31,526		$	(369	)	$	31,157
Restated consolidated statements of cash flows amounts
The correction of the errors described above did not impact our total cash flows from operating activities, investing activities or financing activities within our consolidated statements of cash flows but did result in corrections of the following line items within cash flow from operating activities:
		For the Six Months Ended
		30-Jun-12
		As			Restatement			Restated
		Previously			Adjustments
		Reported
		(in thousands)
Net income		$	31,232		$	(369	)	$	30,863
Accrued expenses and other			1,382			(257	)		1,125
Deferred revenues			4,471			626			5,097
Remediation Efforts to Address Newly Identified Material Weaknesses

Note_3_Acquisitions_Tables

Note 3 - Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2013
Business Combinations [Abstract]	'
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	'
	Cash and cash equivalents	$	3,659
	Accounts receivable		12,016
	Inventories		4,380
	Prepaid and other assets		2,980
	Fixed assets		1,600
	Identifiable intangible assets		74,700
	Goodwill		91,008
	Total assets acquired		190,343
	Accounts payable, accrued expenses and other liabilities		(7,942	)
	Deferred revenues		(6,997	)
	Deferred tax liability, net		(22,964	)
	Net assets acquired	$	152,440
	Cash and cash equivalents	$	13,417
	Accounts receivable		4,610
	Inventories		3,156
	Prepaid and other assets		796
	Fixed assets		936
	Identifiable intangible assets		65,600
	Goodwill		102,594
	Total assets acquired		191,109
	Accounts payable, accrued expenses and other liabilities		(6,889	)
	Deferred revenues		(6,387	)
	Deferred tax liability, net		(14,146	)
	Net assets acquired	$	163,687
Business Acquisition, Pro Forma Information [Table Text Block]	'
		Three Months Ended			Six Months Ended
		30-Jun-12			30-Jun-12
	Total revenues	$	116,629		$	225,458
	Net income		5,586			6,839

Note_4_Restructuring_Tables

Note 4 - Restructuring (Tables)	6 Months Ended
	Jun. 30, 2013
Restructuring and Related Activities [Abstract]	'
Restructuring and Related Costs [Table Text Block]	'
	Accrual at December 31, 2011	$	-
	Charges		4,077
	Payments		(2,275	)
	Non-cash items		(776	)
	Accrual at December 31, 2012		1,026
	Charges		58
	Payments		(391	)
	Non-cash items		(102	)
	Accrual at June 30, 2013	$	591

Note_6_Selected_Balance_Sheet_1

Note 6 - Selected Balance Sheet Data (Tables)	6 Months Ended
	Jun. 30, 2013
Disclosure Text Block Supplement [Abstract]	'
Available-for-sale Securities [Table Text Block]	'
		Amortized		Gross Unrealized		Gross Unrealized			Fair
		Cost		Gains		Losses			Value
	Available-for-sale – short-term:
	U.S. Treasury, government and agency debt securities	$	86,606	$	21	$	(46	)	$	86,581
	Corporate debt securities		90,638		1,056		(233	)		91,461
			177,244		1,077		(279	)		178,042
	Available-for-sale – long-term:
	Auction rate securities		369		1		—			370
			369		1		—			370
	Total	$	177,613	$	1,078	$	(279	)	$	178,412
		Amortized		Gross Unrealized		Gross Unrealized			Fair
		Cost		Gains		Losses			Value
	Available-for-sale – short-term:
	U.S. Treasury, government and agency debt securities	$	77,823	$	48	$	(1	)	$	77,870
	Corporate debt securities		47,933		1,068		(20	)		48,981
			125,756		1,116		(21	)		126,851
	Available-for-sale – long-term:
	Auction rate securities		820		2,301		(2	)		3,119
			820		2,301		(2	)		3,119
	Total	$	126,576	$	3,417	$	(23	)	$	129,970
Investments Classified by Contractual Maturity Date [Table Text Block]	'
		Amortized Cost		Fair Value
	Due in less than 1 year	$	38,159	$	38,206
	Due within 1-2 years		86,642		86,658
	Due within 2-5 years		51,300		51,119
	Due after 5 years		1,512		2,429
	Total	$	177,613	$	178,412
Schedule of Inventory, Current [Table Text Block]	'
		June 30,		December 31,
		2013		2012
	Raw materials	$	2,909	$	4,530
	Work in process		18,143		14,144
	Finished goods		15,329		18,546
		$	36,381	$	37,220

Note_7_Goodwill_and_Other_Inta1

Note 7 - Goodwill and Other Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Schedule of Goodwill [Table Text Block]	'
	Balance at January 1, 2012:	$	66,429
	Acquisition of Anue		91,376
	Acquisition of BreakingPoint		102,652
	Balance at December 31, 2012:	$	260,457
	Anue Acquisition		(367	)
	BreakingPoint Acquisition		(58	)
	Balance at June 30, 2013	$	260,032
Schedule of Finite-Lived Intangible Assets [Table Text Block]	'
		Weighted
		Average
		Useful Life			Gross		Accumulated			Net
		(in years)					Amortization
	Other intangible assets:
	Technology		5.4		$	141,215	$	(77,655	)	$	63,560
	Customer relationships		6			70,376		(24,071	)		46,305
	Service agreements		5.7			22,700		(7,265	)		15,435
	Non-compete agreements		4.2			5,700		(2,207	)		3,493
	Trademark		5.3			8,976		(3,016	)		5,960
	Other		4			3,869		(1,359	)		2,510
					$	252,836	$	(115,573	)	$	137,263
		Weighted
		Average
		Useful Life			Gross		Accumulated			Net
		(in years)					Amortization
	Other intangible assets:
	Technology		5.4		$	141,215	$	(66,704	)	$	74,511
	Customer relationships		6			70,376		(18,289	)		52,087
	Service agreements		5.7			22,700		(5,272	)		17,428
	Non-compete agreements		4.2			5,700		(1,520	)		4,180
	Trademark		5.3			8,976		(2,333	)		6,643
	Other		3.8			3,416		(1,262	)		2,154
					$	252,383	$	(95,380	)	$	157,003
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	'
	2013	$	19,668
	2014		33,928
	2015		29,251
	2016		25,898
	2017		18,853
	Thereafter		9,665
		$	137,263

Note_9_Earnings_Per_Share_Tabl

Note 9 - Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2013
Earnings per share: [Abstract]	'
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	'
		Three months ended				Six months ended
		June 30,				June 30,
		2013		2012		2013		2012
	Basic presentation:
	Numerator for basic earnings per share:
	Net income	$	3,017	$	25,696	$	10,837	$	30,863
	Denominator for basic earnings per share:
	Weighted average common shares outstanding		75,667		71,579		75,194		71,079
	Basic earnings per share	$	0.04	$	0.36	$	0.14	$	0.43
	Diluted presentation:
	Numerator for diluted earnings per share:
	Net income	$	3,017	$	25,696	$	10,837	$	30,863
	Interest expense on convertible senior notes, net of tax		—		1,100		—		2,200
	Net income used for diluted earnings per share	$	3,017	$	26,796	$	10,837	$	33,063
	Denominator for dilutive earnings per share:
	Weighted average common shares outstanding		75,667		71,579		75,194		71,079
	Effect of dilutive securities:
	Stock options and other share-based awards		1,511		1,934		1,780		2,139
	Convertible senior notes		—		10,290		—		10,290
	Dilutive potential common shares		77,178		83,803		76,974		83,508
	Diluted earnings per share	$	0.04	$	0.32	$	0.14	$	0.4

Note_10_Concentrations_Tables

Note 10 - Concentrations (Tables)	6 Months Ended
	Jun. 30, 2013
Sales Revenue, Goods, Net [Member]	'
Note 10 - Concentrations (Tables) [Line Items]	'
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]	'
		Three months ended						Six months ended
		June 30,						June 30,
		2013			2012			2013			2012
	Customer A		15.7	%		*			17.2	%		*
	Customer B		*			14.9	%		10.4	%		16	%
		Three months ended						Six months ended
		June 30,						June 30,
		2013			2012			2013			2012
	International revenues		33.7	%		44.5	%		35.8	%		46.7	%
		Three months ended						Six months ended
		June 30,						June 30,
		2013			2012			2013			2012
	Japan		*			14.4	%		*			14.2	%
Accounts Receivable [Member]	'
Note 10 - Concentrations (Tables) [Line Items]	'
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]	'
		June 30,			December 31,
		2013			2012
	Customer A		10	%		*
	Customer B		10.6	%		*

Note_11_Fair_Value_Measurement1

Note 11 - Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2013
Fair Value Disclosures [Abstract]	'
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	'
		30-Jun-13											December 31, 2012
		Fair Value			Quoted			Significant			Significant		Fair Value		Quoted		Significant		Significant
					Prices in			Other			Unobservable				Prices in		Other		Unobservable
					Active			Observable			Inputs				Active		Observable		Inputs
					Markets for			Inputs			(Level 3)				Markets for		Inputs		(Level 3)
					Identical			(Level 2)							Identical		(Level 2)
					Assets										Assets
					(Level 1)										(Level 1)
	Cash equivalents:
	Money market funds	$	251		$	251		$	—		$	—	$	185	$	185	$	—	$	—
	Corporate debt securities		29,139			—			29,139			—		—		—		—		—
	Short-term investments:
	U.S. Treasury, government and agency debt securities		86,581			—			86,581			—		77,870		—		77,870		—
	Corporate debt securities		91,461			—			91,461			—		48,981		—		48,981		—
	Long-term investments:
	Auction rate securities		370			—			—			370		3,119		—		—		3,119
	Total financial assets	$	207,802		$	251		$	207,181		$	370	$	130,155	$	185	$	126,851	$	3,119
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	'
		Three months ended						Six months ended
		June 30,						June 30,
		2013			2012			2013			2012
	Beginning balance	$	3,167		$	2,954		$	3,119		$	2,774
	Unrealized (loss) gain reclassified from/recorded in other comprehensive income		(2,346	)		(119	)		(2,298	)		61
	Realized gain recorded in earnings		2,869			—			2,869			—
	Sales		(3,320	)		—			(3,320	)		—
	Ending balance	$	370		$	2,835		$	370		$	2,835

Note_14_Restatement_Tables

Note 14 - Restatement (Tables)	6 Months Ended
	Jun. 30, 2013
Accounting Changes and Error Corrections [Abstract]	'
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]	'
		As of June 30, 2013
		As Previously			Restatement
		Reported			Adjustments			Restated
		(in thousands)
	Prepaid expenses and other current assets	$	46,657		$	4,514		$	51,171
	Total current assets		408,148			4,514			412,662
	Other assets		10,221			3,731			13,952
	Total assets		848,775			8,245			857,020
	Deferred revenues - current		67,195			4,474			71,669
	Total current liabilities		122,020			4,474			126,494
	Deferred revenues - non-current		10,295			741			11,036
	Other liabilities		32,353			5,260			37,613
	Total liabilities		364,668			10,475			375,143
	Additional paid-in capital		182,434			(1,199	)		181,235
	Retained earnings		129,164			(1,031	)		128,133
	Total shareholders’ equity		484,107			(2,230	)		481,877
	Total liabilities and shareholders’ equity	$	848,775		$	8,245		$	857,020
		For the Three Months Ended June 30, 2013
		As Previously			Restatement
		Reported			Adjustments			Restated
		(in thousands, except per share data)
	Revenues:
	Products	$	87,818		$	(4,024	)	$	83,794
	Services		28,077			133			28,210
	Total revenues		115,895			(3,891	)		112,004
	Costs and operating expenses:
	Research and development		29,539			(471	)		29,068
	Sales and marketing		33,191			(208	)		32,983
	General and administrative		12,027			(520	)		11,507
	Total costs and operating expenses		110,304			(1,199	)		109,105
	Income from operations		5,591			(2,692	)		2,899
	Income before income taxes		7,079			(2,692	)		4,387
	Income tax expense		3,316			(1,946	)		1,370
	Net income		3,763			(746	)		3,017
	Earnings per share:
	Basic	$	0.05		$	(0.01	)	$	0.04
	Diluted	$	0.05		$	(0.01	)	$	0.04
	Stock-based compensation included in:
	Research and development	$	2,049		$	(471	)	$	1,578
	Sales and marketing		1,836			(208	)		1,628
	General and administrative		1,679			(520	)		1,159
		For the Six Months Ended June 30, 2013
		As Previously			Restatement
		Reported			Adjustments			Restated
		(in thousands, except per share data)
	Revenues:
	Products	$	184,454		$	(5,149	)	$	179,305
	Services		54,224			(66	)		54,158
	Total revenues		238,678			(5,215	)		233,463
	Costs and operating expenses:
	Research and development		59,251			(471	)		58,780
	Sales and marketing		68,232			(208	)		68,024
	General and administrative		24,085			(520	)		23,565
	Total costs and operating expenses		222,995			(1,199	)		221,796
	Income from operations		15,683			(4,016	)		11,667
	Income before income taxes		15,435			(4,016	)		11,419
	Income tax expense		3,567			(2,985	)		582
	Net income		11,868			(1,031	)		10,837
	Earnings per share:
	Basic	$	0.16		$	(0.02	)	$	0.14
	Diluted	$	0.15		$	(0.01	)	$	0.14
	Stock-based compensation included in:
	Research and development	$	4,497		$	(471	)	$	4,026
Sales and marketing		3,851			(208	)		3,643
General and administrative		3,884			(520	)		3,364
	For the Three Months Ended June 30, 2013
	As Previously			Restatement
	Reported			Adjustments			Restated
	(in thousands)
Net Income	$	3,763		$	(746	)	$	3,017
Comprehensive Income	$	1,869		$	(746	)	$	1,123
	For the Six Months Ended June 30, 2013
	As Previously			Restatement
	Reported			Adjustments			Restated
	(in thousands)
Net Income	$	11,868		$	(1,031	)	$	10,837
Comprehensive Income	$	9,795		$	(1,031	)	$	8,764
	For the Six Months Ended June 30, 2013
	As Previously			Restatement
	Reported			Adjustments			Restated
	(in thousands)
Net Income	$	11,868		$	(1,031	)	$	10,837
Stock-based compensation		12,621			(1,200	)		11,421
Deferred Income Taxes		(1,649	)		863			(786	)
Prepaid Expenses and Other current Assets		(4,172	)		(4,513	)		(8,685	)
Other Assets		(282	)		1,691			1,409
Deferred Revenues		2,699			5,215			7,914
Other Liabilities		4,708			(1,025	)		3,683
	For the Three Months Ended
	30-Jun-12
	As			Restatement
	Previously
	Reported			Adjustments			Restated
	(in thousands, except per share data)
Revenues:
Products
Implied arrangement error	$	—		$	(2,650	)	$	—
		75,938			(2,650	)		73,288
Services
Accounting practice error		—			340			—
Implied arrangement error		—			669			—
		16,405			1,009			17,414
Total revenues		92,343			(1,641	)		90,702
Income from operations		8,104			(1,641	)		6,463
Income before income taxes		6,906			(1,641	)		5,265
Income tax benefit		(19,944	)		(487	)		(20,431	)
Net income		26,850			(1,154	)		25,696
Earnings per share:
Basic	$	0.38		$	(0.02	)	$	0.36
Diluted	$	0.33		$	(0.01	)	$	0.32
	For the Six Months Ended
	30-Jun-12
	As			Restatement
	Previously
	Reported			Adjustments			Restated
	(in thousands, except per share data)
Revenues:
Products
Implied arrangement error	$	—		$	(2,086	)	$	—
		144,981			(2,086	)		142,895
Services
Accounting practice error		—			1,028			—
Implied arrangement error		—			432			—
		33,005			1,460			34,465
Total revenues		177,986			(626	)		177,360
Income from operations		15,391			(626	)		14,765
Income before income taxes		12,503			(626	)		11,877
Income tax benefit		(18,729	)		(257	)		(18,986	)
Net income		31,232			(369	)		30,863
Earnings per share:
Basic	$	0.44		$	(0.01	)	$	0.43
Diluted	$	0.4		$	—		$	0.4
	For the Three Months Ended
	30-Jun-12
	As			Restatement			Restated
	Previously			Adjustments
	Reported
	(in thousands)
Net income	$	26,850		$	(1,154	)	$	25,696
Comprehensive income	$	26,357		$	(1,154	)	$	25,203
	For the Six Months Ended
	30-Jun-12
	As			Restatement			Restated
	Previously			Adjustments
	Reported
	(in thousands)
Net income	$	31,232		$	(369	)	$	30,863
Comprehensive income	$	31,526		$	(369	)	$	31,157
	For the Six Months Ended
	30-Jun-12
	As			Restatement			Restated
	Previously			Adjustments
	Reported
	(in thousands)
Net income	$	31,232		$	(369	)	$	30,863
Accrued expenses and other		1,382			(257	)		1,125
Deferred revenues		4,471			626			5,097

Note_1_Business_Details

Note 1 - Business (Details)	6 Months Ended
	Jun. 30, 2013
Disclosure Text Block [Abstract]	'
Number of Operating Segments	1

Note_3_Acquisitions_Details

Note 3 - Acquisitions (Details) (USD $)

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

0 Months Ended

3 Months Ended

6 Months Ended

0 Months Ended

3 Months Ended

6 Months Ended

0 Months Ended

Jun. 30, 2013

Jun. 30, 2012

Jun. 30, 2013

Jun. 30, 2012

Jun. 30, 2013

Jun. 30, 2013

Jun. 01, 2012

Jun. 01, 2012

Jun. 01, 2012

Jun. 01, 2012

Jun. 01, 2012

Jun. 01, 2012

Jun. 30, 2013

Jun. 30, 2012

Jun. 30, 2013

Jun. 30, 2012

Aug. 24, 2012

Aug. 24, 2012

Aug. 24, 2012

Aug. 24, 2012

Aug. 24, 2012

Aug. 24, 2012

Aug. 24, 2012

Jun. 30, 2013

Jun. 30, 2013

Jun. 01, 2012

Aug. 24, 2012

Jun. 01, 2012

Aug. 24, 2012

Acquisition and Other Related [Member]

Acquisition and Other Related [Member]

Anue Systems, Inc. [Member]

Anue Systems, Inc. [Member]

Anue Systems, Inc. [Member]

Anue Systems, Inc. [Member]

Anue Systems, Inc. [Member]

Anue Systems, Inc. [Member]

Anue Systems, Inc. [Member]

Anue Systems, Inc. [Member]

Anue Systems, Inc. [Member]

Anue Systems, Inc. [Member]

BreakingPoint Systems, Inc. [Member]

BreakingPoint Systems, Inc. [Member]

BreakingPoint Systems, Inc. [Member]

BreakingPoint Systems, Inc. [Member]

BreakingPoint Systems, Inc. [Member]

BreakingPoint Systems, Inc. [Member]

BreakingPoint Systems, Inc. [Member]

BreakingPoint Systems, Inc. [Member]

BreakingPoint Systems, Inc. [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

BreakingPoint Systems, Inc. [Member]

BreakingPoint Systems, Inc. [Member]

Developed Technology Rights [Member]

Customer Relationships [Member]

Trade Names [Member]

Noncompete Agreements [Member]

Other Intangible Assets [Member]

Developed Technology Rights [Member]

Customer Relationships [Member]

Trade Names [Member]

Noncompete Agreements [Member]

Other Intangible Assets [Member]

Service Agreements [Member]

Anue Systems, Inc. [Member]

BreakingPoint Systems, Inc. [Member]

Anue Systems, Inc. [Member]

BreakingPoint Systems, Inc. [Member]

Note 3 - Acquisitions (Details) [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments to Acquire Businesses, Gross

'

'

'

'

'

'

'

'

'

'

'

'

$152,400,000

'

'

'

'

'

'

'

'

'

$163,700,000

'

'

'

'

'

'

Business Combination, Acquisition Related Costs

1,093,000

3,739,000

2,365,000

4,164,000

'

'

'

'

'

'

'

'

46,000

2,600,000

269,000

3,000,000

'

'

'

'

'

'

'

1,000,000

2,100,000

'

'

'

'

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables, Increase (Decrease) in Value

'

'

'

'

'

'

'

'

'

'

'

'

173,000

'

'

'

'

'

'

'

'

'

'

58,000

'

'

'

'

'

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable, Accrued Expenses and Other Liabilities, Increase (Decrease) in Value

'

'

'

'

'

'

'

'

'

'

'

'

-172,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent, Increase (Decrease) in Value

'

'

'

'

'

'

'

'

'

'

'

'

-22,000

'

'

'

'

'

'

'

'

'

'

264,000

'

'

'

'

'

Goodwill, Other Changes

'

'

'

'

'

'

'

'

'

'

'

'

367,000

'

'

'

'

'

'

'

'

'

'

322,000

'

'

'

'

'

Finite-lived Intangible Assets Acquired

'

'

'

'

'

'

45,000,000

21,900,000

4,000,000

2,100,000

1,700,000

74,700,000

'

'

'

'

22,700,000

20,600,000

2,900,000

2,200,000

600,000

16,600,000

65,600,000

'

'

'

'

'

'

Acquired Finite-lived Intangible Assets, Weighted Average Useful Life

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'6 months

'14 days

'6 years

'6 years

Business Acquisition, Potential Cash Payment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,800,000

'

'

'

'

'

'

Business Acquisition, Potential Cash Payment, Payment Period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'2 years

Payments to Certain Pre-acquisition Employees

'

'

'

'

474,000

1,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,700,000

'

'

'

'

'

Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual

'

3,900,000

'

3,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual

'

$800,000

'

$800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Note_3_Acquisitions_Details_Pr

Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price (USD $)	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2011	Jun. 01, 2012	Aug. 24, 2012
In Thousands, unless otherwise specified				Anue Systems, Inc. [Member]	BreakingPoint Systems, Inc. [Member]
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price [Line Items]	'	'	'	'	'
Cash and cash equivalents	'	'	'	$3,659	$13,417
Accounts receivable	'	'	'	12,016	4,610
Inventories	'	'	'	4,380	3,156
Prepaid and other assets	'	'	'	2,980	796
Fixed assets	'	'	'	1,600	936
Identifiable intangible assets	'	'	'	74,700	65,600
Goodwill	260,032	260,457	66,429	91,008	102,594
Total assets acquired	'	'	'	190,343	191,109
Accounts payable, accrued expenses and other liabilities	'	'	'	-7,942	-6,889
Deferred revenues	'	'	'	-6,997	-6,387
Deferred tax liability, net	'	'	'	-22,964	-14,146
Net assets acquired	'	'	'	$152,440	$163,687

Note_3_Acquisitions_Details_Pr1

Note 3 - Acquisitions (Details) - Pro Forma Revenues and Net Income of the Combined Entity (USD $)	3 Months Ended	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2012	Jun. 30, 2012
Pro Forma Revenues and Net Income of the Combined Entity [Abstract]	'	'
Total revenues	$116,629	$225,458
Net income	$5,586	$6,839

Note_4_Restructuring_Details

Note 4 - Restructuring (Details) (USD $)	3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 30, 2012	Jun. 30, 2013	Dec. 31, 2012
Note 4 - Restructuring (Details) [Line Items]	'	'	'
Restructuring and Related Cost, Number of Positions Eliminated	29	'	'
Restructuring Charges	'	$58,000	$4,077,000
Restructuring Reserve	'	591,000	1,026,000
Accounts Payable and Accrued Liabilities [Member]	'	'	'
Note 4 - Restructuring (Details) [Line Items]	'	'	'
Restructuring Reserve	'	591,000	1,000,000
AUSTRALIA | Facility Closing [Member]	'	'	'
Note 4 - Restructuring (Details) [Line Items]	'	'	'
Restructuring Charges	'	'	1,400,000
Employee Severance [Member]	'	'	'
Note 4 - Restructuring (Details) [Line Items]	'	'	'
Restructuring Charges	'	'	$2,700,000

Note_4_Restructuring_Details_A

Note 4 - Restructuring (Details) - Activity Related to Restructuring Plan (USD $)	6 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Activity Related to Restructuring Plan [Abstract]	'	'
Accrual	$1,026	'
Charges	58	4,077
Payments	-391	-2,275
Other or non-cash items	-102	-776
Accrual	$591	$1,026

Note_5_Convertible_Senior_Note1

Note 5 - Convertible Senior Notes (Details) (USD $)	1 Months Ended	0 Months Ended
	Dec. 21, 2012	Dec. 07, 2010	Jun. 30, 2013	Dec. 31, 2012
Note 5 - Convertible Senior Notes (Details) [Line Items]	'	'	'	'
Convertible Notes Payable, Noncurrent (in Dollars)	'	$200,000,000	$200,000,000	$200,000,000
Debt Instrument, Interest Rate, Stated Percentage	'	3.00%	'	'
Debt Instrument, Convertible, Conversion Ratio	'	51.4536	'	'
Debt Insturment, Convertible, Principal Amount (in Dollars)	'	1,000	'	'
Debt Instrument, Convertible, Conversion Price (in Dollars per share)	'	$19.43	'	'
Minimum Aggregate Principal Amount of Outstanding Notes Threshold, Percent	'	25.00%	'	'
Debt Instrument, Waiver on Notes Outstanding, Percent	'	50.00%	'	'
Debt Instrument, Basis Spread on Variable Rate	'	0.50%	'	'
Debt Instrument, Interest, Default Principal Due, Percent	'	25.00%	'	'
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)	150,000,000	'	'	'
Debt Covenants, Available Liquidity (in Dollars)	25,000,000	'	'	'
Through June 30, 2014 [Member] | Maximum [Member]	'	'	'	'
Note 5 - Convertible Senior Notes (Details) [Line Items]	'	'	'	'
Leverage Ratio	3.5	'	'	'
After June 30, 2014 [Member] | Maximum [Member]	'	'	'	'
Note 5 - Convertible Senior Notes (Details) [Line Items]	'	'	'	'
Leverage Ratio	3	'	'	'
Fair Value, Inputs, Level 2 [Member]	'	'	'	'
Note 5 - Convertible Senior Notes (Details) [Line Items]	'	'	'	'
Convertible Debt, Fair Value Disclosures (in Dollars)	'	'	$241,400,000	'
Maximum [Member]	'	'	'	'
Note 5 - Convertible Senior Notes (Details) [Line Items]	'	'	'	'
Interest Coverage Ratio	3.5	'	'	'

Note_6_Selected_Balance_Sheet_2

Note 6 - Selected Balance Sheet Data (Details) (USD $)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Disclosure Text Block Supplement [Abstract]	'	'	'
Available-for-sale Securities, Weighted Remaining Contractual Maturity	'	'1 year 204 days	'1 year 131 days
Available-for-sale Securities, Gross Realized Gain (Loss)	$3,200,000	$3,169,000	'
Available-for-sale Securities, Gross Realized Losses	'	0	'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	279,000	279,000	'
Allowance for Doubtful Other Receivables, Current	1,300,000	1,300,000	1,400,000
Accrued Vacation	$8,300,000	$8,300,000	$7,600,000

Note_6_Selected_Balance_Sheet_3

Note 6 - Selected Balance Sheet Data (Details) - Investments in Marketable Securities (USD $)	Jun. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	$177,613	$126,576
Gross Unrealized Gains	1,078	3,417
Gross Unrealized Losses	-279	-23
Fair Value	178,412	129,970
US Treasury and Government [Member] | Short-term Investments [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	86,606	77,823
Gross Unrealized Gains	21	48
Gross Unrealized Losses	-46	-1
Fair Value	86,581	77,870
US Treasury and Government [Member] | Long-term Investments [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair Value	86,581	77,870
Corporate Debt Securities [Member] | Short-term Investments [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	90,638	47,933
Gross Unrealized Gains	1,056	1,068
Gross Unrealized Losses	-233	-20
Fair Value	91,461	48,981
Corporate Debt Securities [Member] | Long-term Investments [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair Value	91,461	48,981
Auction Rate Securities [Member] | Long-term Investments [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	369	820
Gross Unrealized Gains	1	2,301
Gross Unrealized Losses	'	-2
Fair Value	370	3,119
Short-term Investments [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	177,244	125,756
Gross Unrealized Gains	1,077	1,116
Gross Unrealized Losses	-279	-21
Fair Value	178,042	126,851
Long-term Investments [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	369	820
Gross Unrealized Gains	1	2,301
Gross Unrealized Losses	'	-2
Fair Value	$370	$3,119

Note_6_Selected_Balance_Sheet_4

Note 6 - Selected Balance Sheet Data (Details) - Amortized Cost and Fair Value of Investments (USD $)	Jun. 30, 2013
In Thousands, unless otherwise specified
Amortized Cost and Fair Value of Investments [Abstract]	'
Due in less than 1 year	$38,159
Due in less than 1 year	38,206
Due within 1-2 years	86,642
Due within 1-2 years	86,658
Due within 2-5 years	51,300
Due within 2-5 years	51,119
Due after 5 years	1,512
Due after 5 years	2,429
Total	177,613
Total	$178,412

Note_6_Selected_Balance_Sheet_5

Note 6 - Selected Balance Sheet Data (Details) - Inventories (USD $)	Jun. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Inventories [Abstract]	'	'
Raw materials	$2,909	$4,530
Work in process	18,143	14,144
Finished goods	15,329	18,546
	$36,381	$37,220

Note_7_Goodwill_and_Other_Inta2

Note 7 - Goodwill and Other Intangible Assets (Details) - Activity for Goodwill (USD $)	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2013	Dec. 31, 2012	Jun. 01, 2012	Jun. 30, 2013	Dec. 31, 2012	Aug. 24, 2012
In Thousands, unless otherwise specified				Anue Systems, Inc. [Member]	Anue Systems, Inc. [Member]	Anue Systems, Inc. [Member]	BreakingPoint Systems, Inc. [Member]	BreakingPoint Systems, Inc. [Member]	BreakingPoint Systems, Inc. [Member]
Goodwill [Line Items]	'	'	'	'	'	'	'	'	'
Balance	$260,032	$260,457	$66,429	'	'	$91,008	'	'	$102,594
Goodwill acquired	'	'	'	'	91,376	'	'	102,652	'
Goodwill adjustment	'	'	'	-367	'	'	-58	'	'
Balance	$260,032	$260,457	$66,429	'	'	$91,008	'	'	$102,594

Note_7_Goodwill_and_Other_Inta3

Note 7 - Goodwill and Other Intangible Assets (Details) - Purchased Intangible Assets (USD $)	6 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Other intangible assets:	'	'
Gross	$252,836	$252,383
Accumulated Amortization	-115,573	-95,380
Net	137,263	157,003
Technology-Based Intangible Assets [Member]	'	'
Other intangible assets:	'	'
Weighted Average Useful Life	'5 years 146 days	'5 years 146 days
Gross	141,215	141,215
Accumulated Amortization	-77,655	-66,704
Net	63,560	74,511
Customer Relationships [Member]	'	'
Other intangible assets:	'	'
Weighted Average Useful Life	'6 years	'6 years
Gross	70,376	70,376
Accumulated Amortization	-24,071	-18,289
Net	46,305	52,087
Service Agreements [Member]	'	'
Other intangible assets:	'	'
Weighted Average Useful Life	'5 years 255 days	'5 years 255 days
Gross	22,700	22,700
Accumulated Amortization	-7,265	-5,272
Net	15,435	17,428
Noncompete Agreements [Member]	'	'
Other intangible assets:	'	'
Weighted Average Useful Life	'4 years 73 days	'4 years 73 days
Gross	5,700	5,700
Accumulated Amortization	-2,207	-1,520
Net	3,493	4,180
Trademarks [Member]	'	'
Other intangible assets:	'	'
Weighted Average Useful Life	'5 years 109 days	'5 years 109 days
Gross	8,976	8,976
Accumulated Amortization	-3,016	-2,333
Net	5,960	6,643
Other Intangible Assets [Member]	'	'
Other intangible assets:	'	'
Weighted Average Useful Life	'4 years	'3 years 292 days
Gross	3,869	3,416
Accumulated Amortization	-1,359	-1,262
Net	$2,510	$2,154

Note_7_Goodwill_and_Other_Inta4

Note 7 - Goodwill and Other Intangible Assets (Details) - Estimated Future Amortization Expense of Purchased Intangible Assets (USD $)	Jun. 30, 2013
In Thousands, unless otherwise specified
Estimated Future Amortization Expense of Purchased Intangible Assets [Abstract]	'
2013	$19,668
2014	33,928
2015	29,251
2016	25,898
2017	18,853
Thereafter	9,665
	$137,263

Note_8_Shareholders_Equity_Det

Note 8 - Shareholders' Equity (Details) (USD $)

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

1 Months Ended

3 Months Ended

6 Months Ended

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Share-based Compensation Expense [Member]

Share-based Compensation Expense [Member]

Subject to Options and Share Appreciation Rights [Member]

Subject to Restricted Stock Unit and Restricted Stock Awards [Member]

Subject to Cash Awards [Member]

Amended and Restated 2008 Equity Incentive Plan [Member]

Amended and Restated 2008 Equity Incentive Plan [Member]

The 2010 Employee Stock Purchase Plan [Member]

The 2010 Employee Stock Purchase Plan [Member]

Tax on Realized Gains on Sale of Available-for-sale Securities [Member]

Tax on Realized Gains on Sale of Available-for-sale Securities [Member]

Amended and Restated 2008 Equity Incentive Plan [Member]

Amended and Restated 2008 Equity Incentive Plan [Member]

Amended and Restated 2008 Equity Incentive Plan [Member]

Non-Employee Director [Member]

Note 8 - Shareholders' Equity (Details) [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax

$3,100,000

$3,200,000

'

'

'

'

'

'

'

'

'

'

'

Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax

'

'

'

'

'

'

'

'

'

'

'

1,200,000

1,200,000

Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments and Tax

286,000

517,000

'

'

'

'

'

'

'

'

'

'

'

Available-for-sale Securities, Income Tax Expense on Change in Unrealized Holding Gain (Loss)

80,000

145,000

'

'

'

'

'

'

'

'

'

'

'

Increase in Number of Shares of Common Stock Available for Future Grants (in Shares)

'

'

'

'

'

'

'

'

9,800,000

2,000,000

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)

'

'

'

'

'

'

'

'

29,000,000

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)

'

'

'

'

'

'

'

'

13,300,000

'

'

'

'

Award Limits, Share Limit on an Eligible Participant in a Calendar Year (in Shares)

'

'

'

'

1,000,000

1,000,000

'

'

'

'

'

'

'

Award Limits, Value Limit on an Eligible Participant in a Calendar Year

'

'

'

'

'

'

2,000,000

500,000

'

'

'

'

'

Quantifying Misstatement in Current Year Financial Statements, Amount

'

'

($4,000,000)

($2,800,000)

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in Shares)

'

'

'

'

'

'

'

'

'

'

500,000

'

'

Note_9_Earnings_Per_Share_Deta

Note 9 - Earnings Per Share (Details)	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2013
	Stock Opions and Other Share Based Awards [Member]	Stock Opions and Other Share Based Awards [Member]	Convertible Debt Securities [Member]	Convertible Debt Securities [Member]	Stock Opions and Other Share Based Awards [Member]	Stock Opions and Other Share Based Awards [Member]
Note 9 - Earnings Per Share (Details) [Line Items]	'	'	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1.7	1.6	10.3	10.3	2.2	1.3

Note_9_Earnings_Per_Share_Deta1

Note 9 - Earnings Per Share (Details) - Computation of Basic and Diluted Earnings Per Share (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Computation of Basic and Diluted Earnings Per Share [Abstract]	'	'	'	'
Net income (in Dollars)	$3,017	$25,696	$10,837	$30,863
Weighted average common shares outstanding	75,667	71,579	75,194	71,079
Basic earnings per share (in Dollars per share)	$0.04	$0.36	$0.14	$0.43
Net income (in Dollars)	3,017	25,696	10,837	30,863
Interest expense on convertible senior notes, net of tax (in Dollars)	'	1,100	'	2,200
Net income used for diluted earnings per share (in Dollars)	$3,017	$26,796	$10,837	$33,063
Weighted average common shares outstanding	75,667	71,579	75,194	71,079
Stock options and other share-based awards	1,511	1,934	1,780	2,139
Convertible senior notes	'	10,290	'	10,290
Dilutive potential common shares	77,178	83,803	76,974	83,508
Diluted earnings per share (in Dollars per share)	$0.04	$0.32	$0.14	$0.40

Note_10_Concentrations_Details

Note 10 - Concentrations (Details)	Jun. 30, 2013
Risks and Uncertainties [Abstract]	'
Revenue Concentration Benchmark	10.00%

Note_10_Concentrations_Details1

Note 10 - Concentrations (Details) - Revenue Concentrations (Sales Revenue, Net [Member])	3 Months Ended			6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012
Customer A [Member] | Customer Concentration Risk [Member]	'		'	'		'
Concentration Risk [Line Items]	'		'	'		'
Customer	15.70%		'	17.20%		'	[1]
Customer B [Member] | Customer Concentration Risk [Member]	'		'	'		'
Concentration Risk [Line Items]	'		'	'		'
Customer	'	[1]	14.90%	10.40%		16.00%
Geographic Concentration Risk [Member] | International [Member]	'		'	'		'
Concentration Risk [Line Items]	'		'	'		'
Customer	33.70%		44.50%	35.80%		46.70%
Geographic Concentration Risk [Member] | JAPAN	'		'	'		'
Concentration Risk [Line Items]	'		'	'		'
Customer	'	[1]	14.40%	'	[1]	14.20%
[1]	Less than 10%

Note_10_Concentrations_Details2

Note 10 - Concentrations (Details) - Accounts Receivable Concentrations (Customer Concentration Risk [Member], Accounts Receivable [Member])	6 Months Ended
	Jun. 30, 2013
Customer A [Member]	'
Concentration Risk [Line Items]	'
Customer	10.00%
Customer B [Member]	'
Concentration Risk [Line Items]	'
Customer	10.60%

Note_11_Fair_Value_Measurement2

Note 11 - Fair Value Measurements (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Note 11 - Fair Value Measurements (Details) [Line Items]	'	'
Available-for-sale Securities, Gross Realized Gain (Loss)	$3,200,000	$3,169,000
Auction Rate Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Long-term Investments [Member]	'	'
Note 11 - Fair Value Measurements (Details) [Line Items]	'	'
Available-for-sale Securities, Sold at Par	4,000,000	'
Available-for-sale Securities, Gross Realized Gain (Loss)	$2,900,000	'

Note_11_Fair_Value_Measurement3

Note 11 - Fair Value Measurements (Details) - Financial Assets Carried at Fair Value (USD $)	Jun. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Short-term investments:	'	'
Investments	$178,412	$129,970
Total financial assets	207,802	130,155
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Cash Equivalents [Member]	'	'
Cash equivalents:	'	'
Cash equivalents	251	185
Money Market Funds [Member] | Cash Equivalents [Member]	'	'
Cash equivalents:	'	'
Cash equivalents	251	185
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Cash Equivalents [Member]	'	'
Cash equivalents:	'	'
Cash equivalents	29,139	'
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Long-term Investments [Member]	'	'
Short-term investments:	'	'
Investments	91,461	48,981
Corporate Debt Securities [Member] | Cash Equivalents [Member]	'	'
Cash equivalents:	'	'
Cash equivalents	29,139	'
Corporate Debt Securities [Member] | Long-term Investments [Member]	'	'
Short-term investments:	'	'
Investments	91,461	48,981
US Treasury and Government [Member] | Fair Value, Inputs, Level 2 [Member] | Long-term Investments [Member]	'	'
Short-term investments:	'	'
Investments	86,581	77,870
US Treasury and Government [Member] | Long-term Investments [Member]	'	'
Short-term investments:	'	'
Investments	86,581	77,870
Auction Rate Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Long-term Investments [Member]	'	'
Short-term investments:	'	'
Investments	370	3,119
Auction Rate Securities [Member] | Long-term Investments [Member]	'	'
Short-term investments:	'	'
Investments	370	3,119
Fair Value, Inputs, Level 1 [Member]	'	'
Short-term investments:	'	'
Total financial assets	251	185
Fair Value, Inputs, Level 2 [Member]	'	'
Short-term investments:	'	'
Total financial assets	207,181	126,851
Fair Value, Inputs, Level 3 [Member]	'	'
Short-term investments:	'	'
Total financial assets	370	3,119
Long-term Investments [Member]	'	'
Short-term investments:	'	'
Investments	$370	$3,119

Note_11_Fair_Value_Measurement4

Note 11 - Fair Value Measurements (Details) - Summary of Activity for Auction Rate Securities (Auction Rate Securities [Member], USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Auction Rate Securities [Member]	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'
Beginning balance	$3,167	$2,954	$3,119	$2,774
Unrealized (loss) gain reclassified from/recorded in other comprehensive income	-2,346	-119	-2,298	61
Realized gain recorded in earnings	2,869	'	2,869	'
Sales	-3,320	'	-3,320	'
Ending balance	$370	$2,835	$370	$2,835

Note_12_Commitments_and_Contin1

Note 12 - Commitments and Contingencies (Details) (USD $)	1 Months Ended	3 Months Ended
In Millions, unless otherwise specified	Jan. 31, 2013	Mar. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'	'
Litigation Settlement, Amount	$1.20	'
Proceeds from Legal Settlements	'	$1.20

Note_13_Income_Taxes_Details

Note 13 - Income Taxes (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Income Tax Disclosure [Abstract]	'	'
Deferred Tax Assets, Net of Valuation Allowance, Current	$24.10	$24.20

Note_14_Restatement_Details

Note 14 - Restatement (Details) (USD $)	3 Months Ended	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2013
Accounting Changes and Error Corrections [Abstract]	'	'
Restatement of Prior Year Income, Gross	($1.20)	($1.20)

Note_14_Restatement_Details_Re

Note 14 - Restatement (Details) - Restated Consolidated Financial Statements (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Prepaid expenses and other current assets	$51,171	'	$51,171	'	$42,942
Total current assets	412,662	'	412,662	'	358,044
Other assets	13,952	'	13,952	'	'
Total assets	857,020	'	857,020	'	819,249
Deferred revenues - current	71,669	'	71,669	'	66,096
Total current liabilities	126,494	'	126,494	'	130,735
Deferred revenues - non-current	11,036	'	11,036	'	8,695
Other liabilities	37,613	'	37,613	'	32,321
Total liabilities	375,143	'	375,143	'	371,751
Additional paid-in capital	181,235	'	181,235	'	168,980
Retained earnings	128,133	'	128,133	'	117,296
Total shareholders’ equity	481,877	'	481,877	'	447,498
Total liabilities and shareholders’ equity	857,020	'	857,020	'	819,249
Revenues:	'	'	'	'	'
Products	83,794	73,288	179,305	142,895	'
Services	28,210	17,414	54,158	34,465	'
Total revenues	112,004	90,702	233,463	177,360	'
Research and development	29,068	22,546	58,780	43,397	'
Sales and marketing	32,983	24,556	68,024	49,163	'
General and administrative	11,507	11,090	23,565	22,606	'
Total costs and operating expenses	109,105	'	221,796	'	'
Income from operations	2,899	6,463	11,667	14,765	'
Income before income taxes	4,387	5,265	11,419	11,877	'
Income tax expense	1,370	-20,431	582	-18,986	'
Net income	3,017	25,696	10,837	30,863	'
Accrued expenses and other	'	'	-14,415	1,125	'
Stock-based compensation	'	'	11,421	7,870	'
Deferred Income Taxes	'	'	-786	-23,363	'
Prepaid Expenses and Other current Assets	'	'	-8,685	1,495	'
Other Assets	'	'	1,409	-170	'
Deferred Revenues	'	'	7,914	5,097	'
Other Liabilities	'	'	3,683	'	'
Products	'	'	'	'	'
Comprehensive Income	1,123	25,203	8,764	31,157	'
Earnings per share:	'	'	'	'	'
Basic (in Dollars per share)	$0.04	$0.36	$0.14	$0.43	'
Diluted (in Dollars per share)	$0.04	$0.32	$0.14	$0.40	'
Scenario, Previously Reported [Member] | Research and Development Expense [Member]	'	'	'	'	'
Stock-based compensation included in:	'	'	'	'	'
Stock-based compensation	2,049	'	4,497	'	'
Scenario, Previously Reported [Member] | Selling and Marketing Expense [Member]	'	'	'	'	'
Stock-based compensation included in:	'	'	'	'	'
Stock-based compensation	1,836	'	3,851	'	'
Scenario, Previously Reported [Member] | General and Administrative Expense [Member]	'	'	'	'	'
Stock-based compensation included in:	'	'	'	'	'
Stock-based compensation	1,679	'	3,884	'	'
Scenario, Previously Reported [Member]	'	'	'	'	'
Prepaid expenses and other current assets	46,657	'	46,657	'	'
Total current assets	408,148	'	408,148	'	'
Other assets	10,221	'	10,221	'	'
Total assets	848,775	'	848,775	'	'
Deferred revenues - current	67,195	'	67,195	'	'
Total current liabilities	122,020	'	122,020	'	'
Deferred revenues - non-current	10,295	'	10,295	'	'
Other liabilities	32,353	'	32,353	'	'
Total liabilities	364,668	'	364,668	'	'
Additional paid-in capital	182,434	'	182,434	'	'
Retained earnings	129,164	'	129,164	'	'
Total shareholders’ equity	484,107	'	484,107	'	'
Total liabilities and shareholders’ equity	848,775	'	848,775	'	'
Revenues:	'	'	'	'	'
Products	87,818	75,938	184,454	144,981	'
Services	28,077	16,405	54,224	33,005	'
Total revenues	115,895	92,343	238,678	177,986	'
Research and development	29,539	'	59,251	'	'
Sales and marketing	33,191	'	68,232	'	'
General and administrative	12,027	'	24,085	'	'
Total costs and operating expenses	110,304	'	222,995	'	'
Income from operations	5,591	8,104	15,683	15,391	'
Income before income taxes	7,079	6,906	15,435	12,503	'
Income tax expense	3,316	-19,944	3,567	-18,729	'
Net income	3,763	26,850	11,868	31,232	'
Accrued expenses and other	'	'	'	1,382	'
Stock-based compensation	'	'	12,621	'	'
Deferred Income Taxes	'	'	-1,649	'	'
Prepaid Expenses and Other current Assets	'	'	-4,172	'	'
Other Assets	'	'	-282	'	'
Deferred Revenues	'	'	2,699	4,471	'
Other Liabilities	'	'	4,708	'	'
Products	'	'	'	'	'
Comprehensive Income	1,869	26,357	9,795	31,526	'
Earnings per share:	'	'	'	'	'
Basic (in Dollars per share)	$0.05	$0.38	$0.16	$0.44	'
Diluted (in Dollars per share)	$0.05	$0.33	$0.15	$0.40	'
Scenario, Adjustment [Member] | Research and Development Expense [Member]	'	'	'	'	'
Stock-based compensation included in:	'	'	'	'	'
Stock-based compensation	-471	'	-471	'	'
Scenario, Adjustment [Member] | Selling and Marketing Expense [Member]	'	'	'	'	'
Stock-based compensation included in:	'	'	'	'	'
Stock-based compensation	-208	'	-208	'	'
Scenario, Adjustment [Member] | General and Administrative Expense [Member]	'	'	'	'	'
Stock-based compensation included in:	'	'	'	'	'
Stock-based compensation	-520	'	-520	'	'
Scenario, Adjustment [Member] | Products Revenues [Member] | Implied Arrangement Error [Member]	'	'	'	'	'
Products	'	'	'	'	'
Error	'	-2,650	'	-2,086	'
Scenario, Adjustment [Member] | Services Revenues [Member] | Implied Arrangement Error [Member]	'	'	'	'	'
Products	'	'	'	'	'
Error	'	669	'	432	'
Scenario, Adjustment [Member] | Services Revenues [Member] | Accounting Practice Error [Member]	'	'	'	'	'
Products	'	'	'	'	'
Error	'	340	'	1,028	'
Scenario, Adjustment [Member]	'	'	'	'	'
Prepaid expenses and other current assets	4,514	'	4,514	'	'
Total current assets	4,514	'	4,514	'	'
Other assets	3,731	'	3,731	'	'
Total assets	8,245	'	8,245	'	'
Deferred revenues - current	4,474	'	4,474	'	'
Total current liabilities	4,474	'	4,474	'	'
Deferred revenues - non-current	741	'	741	'	'
Other liabilities	5,260	'	5,260	'	'
Total liabilities	10,475	'	10,475	'	'
Additional paid-in capital	-1,199	'	-1,199	'	'
Retained earnings	-1,031	'	-1,031	'	'
Total shareholders’ equity	-2,230	'	-2,230	'	'
Total liabilities and shareholders’ equity	8,245	'	8,245	'	'
Revenues:	'	'	'	'	'
Products	-4,024	-2,650	-5,149	-2,086	'
Services	133	1,009	-66	1,460	'
Total revenues	-3,891	-1,641	-5,215	-626	'
Research and development	-471	'	-471	'	'
Sales and marketing	-208	'	-208	'	'
General and administrative	-520	'	-520	'	'
Total costs and operating expenses	-1,199	'	-1,199	'	'
Income from operations	-2,692	-1,641	-4,016	-626	'
Income before income taxes	-2,692	-1,641	-4,016	-626	'
Income tax expense	-1,946	-487	-2,985	-257	'
Net income	-746	-1,154	-1,031	-369	'
Accrued expenses and other	'	'	'	-257	'
Stock-based compensation	'	'	-1,200	'	'
Deferred Income Taxes	'	'	863	'	'
Prepaid Expenses and Other current Assets	'	'	-4,513	'	'
Other Assets	'	'	1,691	'	'
Deferred Revenues	'	'	5,215	626	'
Other Liabilities	'	'	-1,025	'	'
Products	'	'	'	'	'
Comprehensive Income	-746	-1,154	-1,031	-369	'
Earnings per share:	'	'	'	'	'
Basic (in Dollars per share)	($0.01)	($0.02)	($0.02)	($0.01)	'
Diluted (in Dollars per share)	($0.01)	($0.01)	($0.01)	'	'
Research and Development Expense [Member]	'	'	'	'	'
Stock-based compensation included in:	'	'	'	'	'
Stock-based compensation	1,578	945	4,026	2,224	'
Selling and Marketing Expense [Member]	'	'	'	'	'
Stock-based compensation included in:	'	'	'	'	'
Stock-based compensation	1,628	911	3,643	1,934	'
General and Administrative Expense [Member]	'	'	'	'	'
Stock-based compensation included in:	'	'	'	'	'
Stock-based compensation	$1,159	$1,809	$3,364	$3,475	'