Informatica 10-Q 30 Apr 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Apr. 24, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	INFORMATICA CORP
Entity Trading Symbol	INFA
Entity Central Index Key	1080099
Document Type	10-Q
Document Period End Date	31-Mar-15
Amendment Flag	FALSE
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	-19
Entity Well-Known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		104,311

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$257,236	$368,531
Short-term investments	241,478	353,130
Accounts receivable, net of allowances of $3,549 and $3,465, respectively	164,219	235,705
Deferred tax assets	44,538	46,867
Prepaid expenses and other current assets	32,720	25,447
Total current assets	740,191	1,029,680
Property and equipment, net	155,699	159,708
Goodwill	542,725	551,196
Other intangible assets, net	39,265	43,161
Long-term deferred tax assets	32,677	32,032
Other assets	17,247	13,809
Total assets	1,527,804	1,829,586
Current liabilities:
Accounts payable	13,022	12,009
Accrued liabilities	56,340	60,404
Accrued compensation and related expenses	46,628	88,336
Income taxes payable	2,694	6,895
Deferred revenues	328,007	324,296
Total current liabilities	446,691	491,940
Long-term deferred revenues	17,392	14,679
Long-term income taxes payable	28,347	30,350
Other liabilities	3,577	3,666
Total liabilities	496,007	540,635
Commitments and contingencies (Note 11)
Stockholders' equity:
Common stock, $0.001 par value; 200,000 shares authorized; 104,212 shares and 108,704 shares issued and outstanding at March 31, 2015 and December 31, 2014, respectively	104	109
Additional paid-in capital	510,919	773,419
Accumulated other comprehensive loss	-47,994	-31,789
Retained earnings	568,768	547,212
Total stockholders’ equity	1,031,797	1,288,951
Total liabilities and stockholders' equity	$1,527,804	$1,829,586

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Accounts receivable, allowances	$3,549	$3,465
Common Stock, par value (usd per share)	$0.00	$0.00
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	104,212,000	108,704,000
Common stock, shares outstanding	104,212,000	108,704,000

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Revenues:
Software	$103,726	$103,043
Service	146,810	140,054
Total revenues	250,536	243,097
Cost of revenues:
Software	3,376	3,119
Service	40,551	40,229
Amortization of acquired technology	2,750	3,985
Total cost of revenues	46,677	47,333
Gross profit	203,859	195,764
Operating expenses:
Research and development	50,677	45,685
Sales and marketing	97,402	91,584
General and administrative	22,457	20,053
Amortization of intangible assets	1,091	1,536
Acquisitions and other charges	0	89
Total operating expenses	171,627	158,947
Income from operations	32,232	36,817
Interest income	871	1,153
Interest expense	-86	-127
Other income (expense), net	368	-84
Income before income taxes	33,385	37,759
Income tax provision	11,828	12,906
Net income	$21,557	$24,853
Basic net income per common share (usd per share)	$0.20	$0.23
Diluted net income per common share (usd per share)	$0.20	$0.22
Shares used in computing basic net income per common share (shares)	105,928	109,164
Shares used in computing diluted net income per common share (shares)	107,424	111,935

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$21,557	$24,853
Other comprehensive income (loss):
Change in foreign currency translation adjustment, net of tax benefit (expense) of $1,560 and $(161)	-17,003	569
Available-for-sale investments:
Change in net unrealized gain, net of tax expense of $(155) and $(57)	251	93
Less: reclassification adjustment for net gain included in net income, net of tax expense of $(2) and $(1)	-3	-2
Net change, net of tax expense of $(153) and $(56)	248	91
Cash flow hedges:
Change in unrealized gain, net of tax expense of $(476) and $(550)	771	898
Less: reclassification adjustment for net (gain) loss included in net income, net of tax benefit (expense) of $(137) and $185	-221	301
Net change, net of tax expense of $(339) and $(735)	550	1,199
Total other comprehensive (loss) income, net of tax effect	-16,205	1,859
Total comprehensive income, net of tax effect	$5,352	$26,712

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (Parenthetical) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax [Abstract]
Tax benefit (expense) related to foreign currency translation adjustment	$1,560	($161)
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax [Abstract]
Tax benefit (expense) related to available-for-sale investments, before reclassification adjustments	-155	-57
Less: Tax benefit (expense) related to reclassification adjustment for sale of securities included in net income	-2	-1
Tax benefit (expense) related to available-for-sale investments	-153	-56
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Effect [Abstract]
Tax benefit (expense) related to unrealized gain (loss) on cash flow hedges arising during the period	-476	-550
Less: Tax benefit (expense) related to reclassification adjustment on cash flow hedges included in net income	-137	185
Tax benefit (expense) related to cash flow hedges	($339)	($735)

CONDENSED_CONSOLIDATED_STATEME3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Operating activities:
Net income	$21,557	$24,853
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,770	4,300
Stock-based compensation	15,090	14,246
Deferred income taxes	1,169	-2,063
Tax benefits from stock-based compensation	1,527	284
Excess tax benefits from stock-based compensation	-1,846	-1,660
Amortization of intangible assets and acquired technology	3,841	5,521
Changes in operating assets and liabilities:
Accounts receivable	71,486	43,360
Prepaid expenses and other assets	-7,367	-3,127
Accounts payable and accrued liabilities	-44,195	-27,845
Income taxes payable	-6,703	-9,101
Deferred revenues	6,911	13,975
Net cash provided by operating activities	66,240	62,743
Investing activities:
Purchases of property and equipment	-2,330	-6,200
Purchases of investments	-17,567	-104,490
Investment in equity interest, net	-534	0
Maturities of investments	29,921	60,180
Sales of investments	99,180	2,752
Net cash provided by (used in) investing activities	108,670	-47,758
Financing activities:
Net proceeds from issuance of common stock	25,596	23,303
Repurchases and retirement of common stock	-300,000	-23,323
Withholding taxes related to restricted stock units net share settlement	-4,719	-3,056
Payment of contingent consideration	0	-3,061
Excess tax benefits from stock-based compensation	1,846	1,660
Net cash used in financing activities	-277,277	-4,477
Effect of foreign exchange rate changes on cash and cash equivalents	-8,928	122
Net (decrease) increase in cash and cash equivalents	-111,295	10,630
Cash and cash equivalents at beginning of period	368,531	297,818
Cash and cash equivalents at end of period	$257,236	$308,448

Summary_of_Significant_Account

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies
	Basis of Presentation
	The accompanying condensed consolidated financial statements of Informatica Corporation (“Informatica,” or the “Company”) have been prepared in conformity with generally accepted accounting principles (“GAAP”) in the United States of America. However, certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed, or omitted, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). In the opinion of management, the financial statements include all normal and recurring adjustments that are necessary to fairly present the results of the interim periods presented. All of the amounts included in this Quarterly Report on Form 10-Q related to the condensed consolidated financial statements and notes thereto as of March 31, 2015 and for the three months ended March 31, 2015 and 2014 are unaudited. The interim results presented are not necessarily indicative of results for any subsequent interim period, the year ending December 31, 2015, or any other future period. On April 6, 2015, the Company entered into a definitive agreement to be acquired by the Canada Pension Plan Investment Board and investment funds advised by Permira Advisers LLC for $48.75 in cash for each share of our common stock. For further information, see Note 14. Subsequent Events of Notes to Condensed Consolidated Financial Statements in Part I, Item 1 of this Report.
	The preparation of the Company's condensed consolidated financial statements in conformity with GAAP requires management to make certain estimates, judgments, and assumptions. For example, the Company makes estimates, judgments, and assumptions in determining vendor-specific objective evidence ("VSOE") and, estimated selling price ("ESP") used in revenue recognition, the realizability of deferred tax assets, uncertain tax positions, fair value of acquired tangible and intangible assets and liabilities assumed during acquisitions, the number of reporting segments, the recoverability of intangible assets and their useful lives, the fair value of stock options and forfeiture estimates used in calculating stock-based compensations, number of performance-based restricted stock units that the Company expects to vest, and the collectability of accounts receivable. The Company believes that the estimates, judgments, and assumptions upon which it relies are reasonable based on information available at the time that these estimates, judgments, and assumptions are made. These estimates, judgments, and assumptions can affect the reported amounts of assets and liabilities as of the date of the financial statements as well as the reported amounts of revenues and expenses during the periods presented. Any material differences between these estimates and actual results will impact the Company's condensed consolidated financial statements. In many cases, the accounting treatment of a particular transaction is specifically dictated by GAAP and does not require management's judgment in its application. There are also areas in which management's judgment in selecting any available alternative would not produce a materially different result.
	The condensed consolidated financial statements include the accounts of the Company and its wholly-owned and majority-owned subsidiaries. All intercompany accounts and transactions have been eliminated.
	These unaudited, condensed consolidated financial statements should be read in conjunction with the Company's audited consolidated financial statements and notes thereto for the year ended December 31, 2014 included in the Company's Annual Report on Form 10-K, as amended, filed with the SEC. The consolidated balance sheet as of December 31, 2014 has been derived from the audited consolidated financial statements of the Company. The Company's significant accounting policies are described in Note 2 to the audited consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2014.
	Certain reclassifications have been made within the condensed consolidated statement of cash flows to conform to the current year presentation. A change was made to present redemptions by issuers of debt securities held by the Company as part of net cash provided by maturities of investments to reflect that these redemptions are an acceleration of the maturity of the debt investment. Redemptions were previously presented as part of net cash provided by sales of investments. This change in presentation did not affect total net cash used in investing activities and conforming changes have been made for all prior periods presented. Net cash provided by redemptions of $14.0 million was reclassified from sales of investments to maturities of investments for the three months ended March 31, 2014.
	Recent Accounting Pronouncements
	In April 2015, the FASB issued Accounting Standards Update ("ASU") 2015-05, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40), Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement, as part of its simplification initiative and clarifies how customers in cloud computing arrangements should determine whether the arrangement includes a software license. Existing GAAP does not include explicit guidance about a customer's accounting for fees paid in a cloud computing arrangement. This ASU eliminates the current requirement that customers analogize to the leases standard when determining the assets acquired in a software license arrangement. If a cloud computing arrangement includes a software license, then the customer should account for the software licenses element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. As a result of this ASU, all software licenses within the scope of Subtopic 350-40 will be accounted for consistent with other licenses of intangible assets. The ASU is effective for us beginning in 2016, with early adoption permitted. An entity can elect to adopt the ASU either (1) prospectively to all arrangements entered into or materially modified after the effective date; or (2) retrospectively. For prospective transition, the only disclosure requirements at transition are the nature of and reason for the change in accounting principle, the transition method, and a qualitative description of the description of the financial statement line items affected by the change. For retrospective transition, the disclosure requirements at transition include the requirements for prospective transition and quantitative information about the effects of the accounting change. The Company is currently assessing its pending adoption of ASU 2015-05 on its consolidated financial statements and disclosures.
	In April 2015, the FASB issued ASU 2015-03, Interest—Imputation of Interest (Subtopic 835-30), Simplifying the Presentation of Debt Issuance Costs, that requires debt issuance costs related to a recognized debt liability to be presented in the balance sheet as a direct reduction from the debt liability, consistent with debt discounts, rather than as an asset. The recognition and measurement guidance for debt issuance costs is not affected by the amendments in this update. This ASU is part of the FASB's initiative to reduce complexity in accounting standards and is effective for the Company beginning in 2016 and early adoption is permitted. The standard requires full retrospective adoption, meaning the standard is applied to all periods presented. The Company is currently assessing its pending adoption of ASU 2015-03 on its consolidated financial statements and disclosures.
	In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), to supersede nearly all existing revenue recognition guidance under U.S. GAAP. The core principle of ASU 2014-09 is to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those good and services. The standard will be effective for the Company in the first quarter of 2017. ASU 2014-09 allows for two methods of adoption: (a) "full retrospective" adoption, meaning the standard is applied to all periods presented, or (b) "modified retrospective" adoption, meaning the cumulative effect of applying ASU 2014-09 is recognized as an adjustment to the 2017 opening retained earnings balance. Early adoption is not permitted. The Company has not yet selected a transition method and is currently evaluating the impact of its pending adoption of ASU 2014-09 on its consolidated financial statements and disclosures.
	In June 2014, the FASB issued ASU 2014-12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. ASU 2014-12 requires that a performance target that affects vesting and could be achieved after the requisite service period be treated as a performance condition. ASU 2014-12 is effective for the Company in its first quarter of 2016 with early adoption permitted. The Company does not expect its pending adoption of ASU 2014-12 to have a material impact on its consolidated financial statements and disclosures.
	In August 2014, the FASB issued ASU 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern, to provide guidance on management’s responsibility in evaluating whether there is substantial doubt about a company’s ability to continue as a going concern and to provide related footnote disclosures. ASU 2014-15 is effective for the Company in the first quarter of 2017 with early adoption permitted. The Company does not expect its pending adoption of ASU 2014-15 to have an impact on the consolidated financial statements and disclosures.
	There have been no other changes to the Company's significant accounting policies since the end of 2014.
	Fair Value Measurement of Financial Assets and Liabilities
	The following table summarizes financial assets and financial liabilities that the Company measures at fair value on a recurring basis as of March 31, 2015 (in thousands):
				Quoted		Significant		Significant
				Prices in		Other		Unobservable
				Active		Observable		Inputs
				Markets for		Inputs		(Level 3)
				Identical		(Level 2)
		Total		Assets
				(Level 1)
	Assets:
	Money market funds (i)	$	1,369	$	1,369	$	—	$	—
	Time deposits (ii)	21,773		21,773		—		—
	Marketable debt securities (ii)	223,705		—		223,705		—
	Total money market funds, time deposits, and marketable debt securities	246,847		23,142		223,705		—
	Foreign currency derivatives (iii)	555		—		555		—
	Total assets	$	247,402	$	23,142	$	224,260	$	—
	Liabilities:
	Foreign currency derivatives (iv)	$	204	$	—	$	204	$	—
	Total liabilities	$	204	$	—	$	204	$	—
	The following table summarizes financial assets and financial liabilities that the Company measures at fair value on a recurring basis as of December 31, 2014 (in thousands):
				Quoted
				Prices in		Significant
				Active		Other		Significant
				Markets for		Observable		Unobservable
				Identical		Inputs		Inputs
		Total		Assets		(Level 2)		(Level 3)
				(Level 1)
	Assets:
	Money market funds (i)	$	15,344	$	15,344	$	—	$	—
	Time deposits (ii)	26,395		26,395		—		—
	Marketable debt securities (ii)	326,735		—		326,735		—
	Total money market funds, time deposits, and marketable debt securities	368,474		41,739		326,735		—
	Foreign currency derivatives (iii)	310		—		310		—
	Total assets	$	368,784	$	41,739	$	327,045	$	—
	Liabilities:
	Foreign currency derivatives (v)	$	915	$	—	$	915	$	—
	Total liabilities	$	915	$	—	$	915	$	—
	____________________
	(i)	Included in cash and cash equivalents on the condensed consolidated balance sheets.
	(ii)	Included in either cash and cash equivalents or short-term investments on the condensed consolidated balance sheets.
	(iii)	Included in prepaid expenses and other current assets on the condensed consolidated balance sheets.
	(iv)	Included in accrued liabilities on the consolidated balance sheets.
	(v)	Included in accrued liabilities and other liabilities on the consolidated balance sheets.
	Money Market Funds, Time Deposits, and Marketable Debt Securities
	The Company uses a market approach for determining the fair value of all its Level 1 and Level 2 money market funds, time deposits, and marketable securities. The Company's marketable securities consist of certificates of deposit, commercial paper, corporate notes and bonds, municipal securities, and U.S. government and agency notes and bonds.
	To value its money market funds and time deposits, the Company values the funds at $1 stable net asset value, which is the market pricing convention for identical assets that the Company has the ability to access. To value its certificates of deposit and commercial paper, the Company uses mathematical calculations to arrive at fair value for these securities, which generally have short maturities and infrequent secondary market trades. For example, in the absence of any observable transactions, the Company may accrete from purchase price at purchase date to face value at maturity. In the event that a transaction is observed on the same security in the marketplace, and the price on that subsequent transaction clearly reflects the market price on that day, the Company will adjust the price in the system to the observed transaction price and follow a revised accretion schedule to determine the daily price.
	To determine the fair value of its corporate notes and bonds, municipal securities, and U.S. government and agency notes and bonds, the Company uses a third party pricing source for each security. If the market price is not available from the third party source, pricing from the Company's investment custodian is used.
	Foreign Currency Derivatives and Hedging Instruments
	The Company uses the income approach to value the derivatives using observable Level 2 market inputs at the measurement date and standard valuation techniques to convert future amounts to a single present value amount, assuming that participants are motivated but not compelled to transact. Level 2 inputs are limited to quoted prices that are observable for the derivative assets and liabilities. The Company records its derivative assets and liabilities at gross in the condensed consolidated balance sheet and uses mid-market pricing as a practical expedient for fair value measurements. Key inputs for foreign currency derivatives are the spot rates, forward rates, interest rates, and credit derivative market rates. The spot rate for each foreign currency is the same spot rate used for all balance sheet translations at the measurement date and is sourced from the Federal Reserve Bulletin. The following values are interpolated from commonly quoted intervals available from Bloomberg: forward points and the London Interbank Offered Rate (“LIBOR”) used to discount and determine the fair value of assets and liabilities. Credit default swap spread curves identified per counterparty at month end in Bloomberg are used to discount derivative assets for counterparty non-performance risk, all of which have terms of twelve months or less. The Company discounts derivative liabilities to reflect the Company’s own potential non-performance risk to lenders and has used the spread over LIBOR on its most recent corporate borrowing rate.
	The counterparties associated with the Company’s foreign currency forward contracts are large credit-worthy financial institutions, and the derivatives transacted with these entities are relatively short in duration; therefore, the Company does not consider counterparty concentration and non-performance to be material risks at this time. Both the Company and the counterparties are expected to perform under the contractual terms of the instruments.
There were no transfers between Level 1 and Level 2 categories during the three months ended March 31, 2015 and 2014.
See Note 5. Accumulated Other Comprehensive Income (Loss), Note 6. Derivative Financial Instruments, and Note 11. Commitments and Contingencies of Notes to Condensed Consolidated Financial Statements for a further discussion.

Cash_Cash_Equivalents_and_Shor

Cash, Cash Equivalents, and Short-Term Investments	3 Months Ended
	Mar. 31, 2015
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Cash, Cash Equivalents, and Short-term Investments	Cash, Cash Equivalents, and Short-Term Investments
	The Company's short-term investments are classified as available-for-sale as of the balance sheet date and are reported at fair value with unrealized gains and losses reported as a separate component of accumulated other comprehensive income in stockholders' equity, net of tax. Realized gains or losses and other-than-temporary impairments, if any, on available-for-sale securities are reported in other income or expense as incurred. Realized gains recognized for the three months ended March 31, 2015 and 2014 were negligible. The cost of securities sold was determined based on the specific identification method.
	The following table summarizes the Company’s cash, cash equivalents, and short-term investments as of March 31, 2015 (in thousands):
				Gross			Gross			Estimated
		Cost		Unrealized			Unrealized			Fair Value
				Gains			Losses
	Cash	$	251,867	$	—		$	—		$	251,867
	Cash equivalents:
	Money market funds	1,369		—			—			1,369
	Commercial Paper	4,000		—			—			4,000
	Total cash equivalents	5,369		—			—			5,369
	Total cash and cash equivalents	257,236		—			—			257,236
	Short-term investments:
	Certificates of deposit	1,920		—			—			1,920
	Commercial paper	8,992		—			—			8,992
	Corporate notes and bonds	114,165		157			(86		)	114,236
	Federal agency notes and bonds	29,072		35			(6		)	29,101
	Time deposits	21,773		—			—			21,773
	Municipal notes and bonds	65,363		98			(5		)	65,456
	Total short-term investments	241,285		290			(97		)	241,478
	Total cash, cash equivalents, and short-term investments	$	498,521	$	290		$	(97	)	$	498,714
	The following table summarizes the Company’s cash, cash equivalents, and short-term investments as of December 31, 2014 (in thousands):
				Gross			Gross			Estimated
		Cost		Unrealized			Unrealized			Fair Value
				Gains			Losses
	Cash	$	353,187	$	—		$	—		$	353,187
	Cash equivalents:
	Money market funds	15,344		—			—			15,344
	Total cash equivalents	15,344		—			—			15,344
	Total cash and cash equivalents	368,531		—			—			368,531
	Short-term investments:
	Certificates of deposit	1,920		—			—			1,920
	Commercial paper	1,996		—			—			1,996
	Corporate notes and bonds	196,401		84			(371		)	196,114
	Federal agency notes and bonds	51,987		13			(44		)	51,956
	Time deposits	26,395		—			—			26,395
	Municipal notes and bonds	74,639		128			(18		)	74,749
	Total short-term investments	353,338		225			(433		)	353,130
	Total cash, cash equivalents, and short-term investments	$	721,869	$	225		$	(433	)	$	721,661
	See Note 1. Summary of Significant Accounting Policies of Notes to Condensed Consolidated Financial Statements for further information regarding the fair value of the Company's financial instruments.
	The following table summarizes the fair value and gross unrealized losses related to the Company’s short-term investments, aggregated by investment category that have been in a continuous unrealized loss position for less than twelve months, at March 31, 2015 (in thousands):
		Less Than 12 months
				Gross
		Fair		Unrealized
		Value		Losses
	Corporate notes and bonds	$	32,411	$	(83	)
	Federal agency notes and bonds	12,009		(6		)
	Municipal notes and bonds	6,542		(5		)
	Total	$	50,962	$	(94	)
	The following table summarizes the fair value and gross unrealized losses related to the Company’s short-term investments, aggregated by investment category that have been in a continuous unrealized loss position for greater than twelve months, at March 31, 2015 (in thousands):
		Greater Than 12 months
				Gross
		Fair		Unrealized
		Value		Losses
	Corporate notes and bonds	$	1,026	$	(3	)
	Total	$	1,026	$	(3	)
	The changes in value of these investments are primarily related to changes in interest rates and are considered to be temporary in nature.
	The following table summarizes the cost and estimated fair value of the Company’s short-term investments by contractual maturity at March 31, 2015 (in thousands):
		Cost		Fair
				Value
	Due within one year	$	152,265	$	152,363
	Due in one year to two years	66,507		66,541
	Due after two years	22,513		22,574
	Total	$	241,285	$	241,478

Intangible_Assets_and_Goodwill

Intangible Assets and Goodwill	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets and Goodwill	Intangible Assets and Goodwill
	The carrying amounts of the intangible assets other than goodwill as of March 31, 2015 and December 31, 2014 are as follows (in thousands, except years):
		March 31, 2015								December 31, 2014							Weighted
																	Average
																	Useful Life
		Cost			Accumulated			Net		Cost		Accumulated			Net		(Years)
					Amortization							Amortization
	Developed and core technology	$	145,875		$	(114,919	)	$	30,956	$	145,929	$	(112,169	)	$	33,760	6
	Other Intangible Assets:
	Customer relationships	45,177			(40,659		)	4,518		45,178		(39,766		)	5,412		5
	All other (i)	19,145			(15,354		)	3,791		19,145		(15,156		)	3,989		9-Apr
	Total other intangible assets	64,322			(56,013		)	8,309		64,323		(54,922		)	9,401
	Total intangible assets, net	$	210,197		$	(170,932	)	$	39,265	$	210,252	$	(167,091	)	$	43,161
	____________________
	(i)	All other includes vendor relationships, trade names, covenants not to compete, and patents.
	Total amortization expense related to intangible assets was $3.8 million and $5.5 million for the three months ended March 31, 2015 and 2014, respectively. Certain intangible assets were recorded in foreign currencies; and therefore, the gross carrying amount and accumulated amortization are subject to foreign currency translation adjustments.
	As of March 31, 2015, the amortization expense related to identifiable intangible assets in future periods is expected to be as follows (in thousands):
		Acquired			Other			Total
		Technology			Intangible			Intangible
					Assets (ii)			Assets
	Remaining 2015	$	7,615		$	3,210		$	10,825
	2016	8,883			2,449			11,332
	2017	6,870			1,152			8,022
	2018	4,756			729			5,485
	2019	2,331			449			2,780
	Thereafter	501			320			821
	Total expected amortization expense	$	30,956		$	8,309		$	39,265
	____________________
	(ii)	Other Intangible Assets includes customer relationships, vendor relationships, trade names, covenants not to compete, and patents.
	The changes in the carrying amount of goodwill for the three months ended March 31, 2015 are as follows (in thousands):
		March 31,
		2015
	Beginning balance as of December 31, 2014	$	551,196
	Goodwill from acquisition	—
	Subsequent goodwill adjustments	(8,471		)
	Ending balance as of March 31, 2015	$	542,725
	During the three months ended March 31, 2015, the Company recorded subsequent goodwill net reductions of $8.5 million primarily related to foreign currency translation adjustments. The goodwill is partially deductible for tax purposes. See Note 13. Acquisitions of Notes to Condensed Consolidated Financial Statements in Part I, Item 1 of this Report for a further discussion of goodwill from acquisitions.

Borrowings

Borrowings	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Borrowings	Borrowings
	Credit Agreement
	On September 26, 2014, the Company entered into a Credit Agreement (the “Credit Agreement”) that matures on September 26, 2019. The Credit Agreement provides for an unsecured revolving credit facility in an amount of up to $220.0 million, with an option for the Company to request to increase the revolving loan commitments or to enter into tranches of term loans in an aggregate amount of up to $30.0 million, for a total credit facility of up to $250.0 million. The revolving credit facility has sublimits for swingline loans available on a same day basis of up to $10.0 million and for the issuance of standby letters of credit in a face amount up to $20.0 million. No amounts were outstanding under the Credit Agreement as of March 31, 2015, and a total of $220.0 million remained available for borrowing.
	Revolving loans accrue interest at a per annum rate based on either, at the Company's election, (i) the base rate plus a margin ranging from 0.50% to 1.00% depending on the Company's consolidated leverage ratio, or (ii) the LIBO rate (based on 1-, 2-, 3-, or 6-month interest periods) plus a margin ranging from 1.50% to 2.00% depending on the Company's consolidated leverage ratio. The base rate is equal to the highest of (i) JPMorgan Chase Bank, N.A.'s prime rate, (ii) the federal funds rate plus a margin equal to 0.50%, and (iii) LIBO rate for a 1-month interest period plus a margin equal to 1.00%. Swingline loans accrue interest at a per annum rate based on the base rate plus the applicable margin for base rate loans. Revolving loans may be borrowed, repaid and reborrowed until September 26, 2019, at which time all amounts borrowed must be repaid. Swingline loans shall be repaid on the 15th day of a calendar month, or the last day of a calendar month, or September 26, 2019, whichever is earlier.
	Accrued interest on the revolving loans is payable (i) quarterly in arrears with respect to base rate loans, (ii) at the end of each interest rate period (or at each 3- month interval in the case of loans with interest periods greater than 3 months) with respect to LIBO rate loans, and (iii) the day that the borrowing is required to be repaid with respect to swingline loans. The Company is also obligated to pay other customary closing fees, arrangement fees, administrative fees, commitment fees, and letter of credit fees. A quarterly commitment fee is applied to the average daily unborrowed amount under the credit facility at a per annum rate ranging from 0.225% to 0.35% depending on the Company's consolidated leverage ratio. The Company may prepay the loans or terminate or reduce the commitments in whole or in part at any time, without premium or penalty, subject to certain conditions including minimum amounts in the case of commitment reductions and reimbursement of certain costs in the case of prepayments of LIBO rate loans.
	The Credit Agreement contains customary representations and warranties, covenants, and events of default, including the requirement to maintain a maximum consolidated leverage ratio of 2.75 to 1.00 and a minimum consolidated interest coverage ratio of 3.50 to 1.00. The occurrence of an event of default could result in the acceleration of the obligations under the Credit Agreement. Under certain circumstances, a default interest rate will apply on all obligations during the existence of a payment default under the Credit Agreement at a per annum rate equal to 2.00% above the applicable interest rate for any overdue principal and 2.00% above the rate applicable to base rate loans for any other overdue amounts. The Company was in compliance with all covenants under the Credit Agreement as of March 31, 2015.
	For further information, see Note 14. Subsequent Events of Notes to Condensed Consolidated Financial Statements in Part I, Item 1 of this Report.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss)
	The following table summarizes the changes in accumulated balances for each component of other comprehensive income (loss) for the three months ended March 31, 2015, net of taxes (in thousands):
			Cumulative			Net Unrealized				Net Unrealized				Total
			Translation			Gain (Loss) on				Gain (Loss) on
			Adjustments			Available-for-Sale				Cash Flow Hedges
						Investments
	Accumulated other comprehensive loss as of December 31, 2014		$	(31,312	)	$	(129	)		$	(348	)		$	(31,789	)
	Other comprehensive income (loss):
	Other comprehensive income (loss) before reclassifications, net of tax benefit (expense) of $1,560, $(155) and $(476)		(17,003		)	251				771				(15,981		)
	Net gain reclassified from accumulated other comprehensive income (loss), net of tax expense of $ —, $(2) and $(137)		—			(3		)	(i)	(221		)	(ii)	(224		)
	Total other comprehensive income (loss), net of tax effect (iii)		(17,003		)	248				550				(16,205		)
	Accumulated other comprehensive income (loss) as of March 31, 2015		$	(48,315	)	$	119			$	202			$	(47,994	)
	____________________
	(i)	The before-tax gain of $5 was included in other expense, net on the condensed consolidated statements of income.
	(ii)	The before-tax gain of $87 and $271 were included in cost of service revenues and operating expenses, primarily research and development expense, respectively on the condensed consolidated statements of income.
	(iii)	The tax expense related to the net gain reclassified from accumulated other comprehensive income (loss) was included in income tax provision on the condensed consolidated statements of income.
	The following table summarizes the changes in accumulated balances for each component of other comprehensive income (loss) for the three months ended March 31, 2014, net of taxes (in thousands):
			Cumulative			Net Unrealized				Net Unrealized				Total
			Translation			Gain (Loss) on				Loss on
			Adjustments			Available-for-Sale				Cash Flow Hedges
						Investments
	Accumulated other comprehensive income (loss) as of December 31, 2013		$	(2,879	)	$	63			$	(396	)		$	(3,212	)
	Other comprehensive income (loss):
	Other comprehensive income before reclassifications, net of tax expense of $(161), $(57) and $(550)		569			93				898				1,560
	Net (gain) loss reclassified from accumulated other comprehensive income (loss), net of tax benefit (expense) of $ —, $(1) and $185		—			(2		)	(i)	301			(ii)	299
	Total other comprehensive income (loss), net of tax effect (iii)		569			91				1,199				1,859
	Accumulated other comprehensive income (loss) as of March 31, 2014		$	(2,310	)	$	154			$	803			$	(1,353	)
	____________________
	(i)	The before-tax loss of $3 was included in other expense, net on the condensed consolidated statements of income.
	(ii)	The before-tax losses of $120 and $366 were included in cost of service revenues and operating expenses, primarily research and development expense, respectively on the condensed consolidated statements of income.
	(iii)	The tax benefit related to the net loss reclassified from accumulated other comprehensive income (loss) was included in income tax provision on the condensed consolidated statements of income.

Derivative_Financial_Instrumen

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments
	The Company’s earnings and cash flows are subject to fluctuations due to changes in foreign currency exchange rates. The Company uses derivative instruments to manage its exposures to fluctuations in certain foreign currency exchange rates which exist as part of ongoing business operations. The Company and its subsidiaries do not enter into derivative contracts for speculative purposes.
	Cash Flow Hedges
	The Company enters into certain cash flow hedge programs in an attempt to reduce the impact of certain foreign currency fluctuations. These contracts are designated and documented as cash flow hedges. The purpose of these programs is to reduce the volatility of identified cash flow and expenses caused by movement in certain foreign currency exchange rates, in particular, the Indian rupee. The Company is currently using foreign exchange forward contracts to hedge the foreign currency anticipated expenses of its subsidiary in India.
	The Company releases the amounts accumulated in other comprehensive income into earnings in the same period or periods during which the forecasted hedge transaction affects earnings. The Company will reclassify all amounts accumulated in other comprehensive income into earnings within the next 12 months.
	The Company has forecasted the amount of its anticipated foreign currency expenses based on its historical performance and its projected financial plan. As of March 31, 2015, the remaining open foreign exchange contracts, carried at fair value, are hedging Indian rupee expenses and have a maturity of twelve months or less. These foreign exchange contracts mature monthly as the foreign currency denominated expenses are paid and any gain or loss is offset against operating expense. Once the hedged item is recognized, the cash flow hedge is de-designated and subsequent changes in value are recognized in other income (expense) to offset changes in the value of the resulting non-functional currency monetary assets or liabilities.
	The notional amounts of these foreign exchange forward contracts in U.S. dollar equivalents were to buy $41.0 million and $45.9 million of Indian rupees as of March 31, 2015 and December 31, 2014, respectively.
	Balance Sheet Hedges
	Balance Sheet hedges consist of cash flow hedge contracts that have been de-designated and non-designated balance sheet hedges. These foreign exchange contracts are carried at fair value and either did not or no longer qualify for hedge accounting treatment and are not designated as hedging instruments. Changes in the value of the foreign exchange contracts are recognized in other income (expense) and offset the foreign currency gain or loss on the underlying net monetary assets or liabilities. The notional amounts of foreign currency contracts open at period end in US dollar equivalents were to buy $10.4 million and $10.6 million of Indian rupees at March 31, 2015 and December 31, 2014, respectively. The notional amounts of foreign currency contracts open at period end in U.S. dollar equivalents were to sell $6.2 million of Indian rupees and $57.1 million of Euros at March 31, 2015 and December 31, 2014, respectively.
	The following table reflects the fair value amounts for the foreign exchange contracts designated and not designated as hedging instruments at March 31, 2015 and December 31, 2014 (in thousands):
		March 31, 2015						December 31, 2014
		Fair Value			Fair Value			Fair Value		Fair Value
		Derivative			Derivative			Derivative		Derivative
		Assets(i)			Liabilities(ii)			Assets(i)		Liabilities(iii)
	Derivatives designated as hedging instruments	$	385		$	14		$	141	$	761
	Derivatives not designated as hedging instruments	170			190			169		154
	Total fair value of derivative instruments	$	555		$	204		$	310	$	915
	____________________
	(i)	Included in prepaid expenses and other current assets on the condensed consolidated balance sheets.
	(ii)	Included in accrued liabilities on the condensed consolidated balance sheets.
	(iii)	Included in accrued liabilities and other liabilities on the condensed consolidated balance sheets.
	The Company presents its derivative assets and derivative liabilities at gross fair values in the condensed consolidated balance sheets. However, under the master netting agreements with the respective counterparties of the foreign exchange contracts, subject to applicable requirements, the Company is allowed to net settle transactions of the same currency with a single net amount payable by one party to the other. The derivatives held by the Company are not subject to any credit contingent features negotiated with its counterparties. The Company is not required to pledge nor is entitled to receive cash collateral related to the above contracts.
	The following table sets forth the offsetting of derivative assets as of March 31, 2015 and December 31, 2014 (in thousands):
										Gross Amounts Not Offset
										in the Condensed Consolidated
										Balance Sheets
		Gross			Gross			Net Amounts					Cash		Net
		Amounts of			Amounts Offset			of Assets		Financial			Collateral		Amount
		Recognized			in the Condensed			Presented		Instruments(i)			Pledged
		Assets			Consolidated			in the Condensed
					Balance Sheets			Consolidated
								Balance Sheets
	As of March 31,
	2015:00:00
	Foreign exchange contracts	$	555		$	—		$	555	$	(78	)	$	—	$	477
	As of December 31,
	2014:00:00
	Foreign exchange contracts	$	310		$	—		$	310	$	(62	)	$	—	$	248
	____________________
	(i)	The balances at March 31, 2015 and December 31, 2014 were related to derivative liabilities which are allowed to be net settled against derivative assets in accordance with the master netting agreements.
	The following table sets forth the offsetting of derivative liabilities as of March 31, 2015 and December 31, 2014 (in thousands):
										Gross Amounts Not Offset
										in the Condensed Consolidated
										Balance Sheets
		Gross			Gross			Net Amounts		Financial			Cash		Net
		Amounts of			Amounts Offset			of Liabilities		Instruments(ii)			Collateral		Amount
		Recognized			in the Condensed			Presented					Pledged
		Liabilities			Consolidated			in the Condensed
					Balance Sheets			Consolidated
								Balance Sheets
	As of March 31,
	2015:00:00
	Foreign exchange contracts	$	204		$	—		$	204	$	(78	)	$	—	$	126
	As of December 31,
	2014:00:00
	Foreign exchange contracts	$	915		$	—		$	915	$	(62	)	$	—	$	853
	____________________
	(ii)	The balances at March 31, 2015 and December 31, 2014 were related to derivative assets which are allowed to be net settled against derivative liabilities in accordance with the master netting agreements.
	The Company evaluates prospectively as well as retrospectively the effectiveness of its hedge programs using statistical analysis. Prospective testing is performed at the inception of the hedge relationship and quarterly thereafter. Retrospective testing is performed on a quarterly basis.
	The before-tax effects of derivative instruments designated as cash flow hedges on the accumulated other comprehensive income (loss) and condensed consolidated statements of income for the three months ended March 31, 2015 and 2014 are as follows (in thousands):
		Three Months Ended
		March 31,
		2015			2014
	Amount of gain recognized in other comprehensive income (effective portion)	$	1,247		$	1,448
Amount of gain (loss) reclassified from accumulated other comprehensive income to cost of service revenues and operating expenses (effective portion)	$	358		$	(486	)
Amount of gain on derivatives due to hedge ineffectiveness recognized in cost of service revenues and operating expenses	$	116		$	—
No amounts were excluded from the assessment of hedge effectiveness during the three months ended March 31, 2015 and 2014.
The before-tax loss recognized in other expense, net for non-designated foreign currency forward contracts for the three months ended March 31, 2015 and 2014 are as follows (in thousands):
	Three Months Ended
	March 31,
	2015			2014
Gain (loss) recognized in other expense, net	$	(77	)	$	75
See Note 1. Summary of Significant Accounting Policies, Note 5. Accumulated Other Comprehensive Income (Loss), and Note 11. Commitments and Contingencies of Notes to Condensed Consolidated Financial Statements for a further discussion.

Stock_Repurchase_Program

Stock Repurchase Program	3 Months Ended
	Mar. 31, 2015
Stock Repurchase Program [Abstract]
Stock Repurchase Program	Stock Repurchase Program
	The Company's Board of Directors has approved a stock repurchase program for the Company to repurchase its common stock. The primary purpose of the program is to enhance shareholder value, including partially offsetting the dilutive impact of stock-based incentive plans. The number of shares to be purchased and the timing of the purchases are based on several factors, including the price of the Company's common stock, the Company's liquidity and working capital needs, general business and market conditions, and other investment opportunities. These purchases can be made from time to time in the open market and are funded from the Company’s available working capital. In each of January, July, and October of 2014, the Board of Directors approved the repurchase of up to an additional $100 million of the Company's outstanding common stock, with such authorizations aggregating to $300 million. In January 2015, we announced that the Board of Directors approved an additional $337 million to augment its existing authorization under our stock repurchase program. Subsequently in February 2015, we entered into separate accelerated stock repurchase ("ASR") agreements with two financial institutions to repurchase an aggregate of $300 million of our common stock. Under the terms of the ASR agreements, we paid an aggregate of $300 million in cash and received an initial delivery of approximately 5.7 million shares on February 4, 2015. The final number of shares to be repurchased will be based on our volume-weighted average stock price less a discount during the term of the transactions. This final settlement of shares is expected to occur no later than the end of the second quarter of 2015.
	The repurchase program authorized by the Board of Directors does not have an expiration date. Repurchased shares are retired and reclassified as authorized and unissued shares of common stock. As of March 31, 2015, $200 million of the previous authorizations remained available for future repurchases.

StockBased_Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation
	The Company grants stock options, restricted stock units (“RSUs”) and performance-based restricted stock units (“PRSUs”) under its 2009 Equity Incentive Plan. Eligible employees may elect to purchase shares of common stock through the Employee Stock Purchase Plan ("ESPP"). The fair value of each option award and ESPP share is estimated on the date of grant using the Black-Scholes-Merton option pricing model that uses the assumptions in the following table. The Company has consistently used a blend of average historical and market-based implied volatilities for calculating the expected volatilities for employee stock options, and uses market-based implied volatilities for its ESPP. The expected term of employee stock options granted is derived from historical exercise patterns of the options, and the expected term of ESPP is based on the contractual terms. The expected term of options granted to employees is derived from the historical option exercises, post-vesting cancellations, and estimates concerning future exercises and cancellations for vested and unvested options that remain outstanding. The risk-free interest rate for the expected term of the option and ESPP is based on the U.S. Treasury yield curve in effect at the time of grant. The Company recognizes its stock-based compensation related to options using a straight-line method over the vesting term of the awards. The Company recognizes its stock-based compensation related to ESPP using a straight-line method over the offering period, which is six months.
	The fair value of RSUs is the grant date closing price of our common stock. Beginning in the first quarter of 2015, the Company granted two types of PRSUs. The fair value of PRSUs, with service and performance conditions, is the grant date closing price of our common stock. The grant date fair value of the PRSUs requiring the satisfaction of service, performance, and market conditions was determined by using a Monte Carlo simulation model, which utilized multiple input variables that determined the probability of satisfying the market condition requirements. The Company recognizes expense related to RSUs using a straight-line method over the vesting term of the awards. The Company recognizes expense for PRSUs, with service and performance conditions, based on the probability of achieving the performance criteria, as defined in the PRSU agreements. The Company recognizes expense for PRSUs with service, performance, and market conditions based on the probability of achieving the performance conditions as long as the requisite service is rendered, even if the market conditions are not met. PRSUs are expensed using the graded vesting attribution method over the requisite service period.
	The Company records stock-based compensation for options, RSUs and PRSUs granted net of estimated forfeiture rates. ASC 718, Stock Compensation, requires the Company to estimate forfeiture rates at the time of grant and revise those estimates in subsequent periods if actual forfeitures differ from those estimates. The Company uses historical forfeitures to estimate its future forfeiture rates.
	The fair value of the Company’s stock-based awards was estimated based on the following assumptions:
		Three Months Ended
		March 31,
		2015			2014
	Option grants:
	Expected volatility	31	%		37 - 40%
	Expected dividends	—			—
	Expected term of options (in years)	3.5			3.5
	Risk-free interest rate	1.1	%		1	%
	ESPP: (i)
	Expected volatility	29	%		36	%
	Expected dividends	—			—
	Expected term of ESPP (in years)	0.5			0.5
	Risk-free interest rate	0.1	%		0.1	%
	PRSUs with market conditions:
	Expected volatility	30% - 39%			—
	Expected dividends	—			—
	Risk-free interest rate	1	%		—
	____________________
	(i)	ESPP purchases are scheduled for the last day of January and July of each year.
	The allocations of the stock-based compensation, net of estimated income tax benefit, for the three months ended March 31, 2015 and 2014 are as follows (in thousands):
		Three Months Ended
		March 31,
		2015				2014
	Cost of service revenues	$	1,539			$	1,464
	Research and development	5,060				4,662
	Sales and marketing	4,769				4,706
	General and administrative	3,722				3,414
	Total stock-based compensation	15,090				14,246
	Estimated tax benefit of stock-based compensation	(4,040		)		(3,862		)
	Total stock-based compensation, net of estimated tax benefit	$	11,050			$	10,384
	Stock Option Activity
	A summary of stock option activity through March 31, 2015 is presented below (in thousands, except per share amounts):
					Weighted-				Weighted	Aggregate
					Average				Average	Intrinsic
		Number of			Exercise Price				Remaining	Value
		Shares			Per Share				Contractual
									Term (Years)
	Outstanding at December 31, 2014	7,186			$	35.82			4.25	$	31,514
	Granted	464			$	42.5
	Exercised	(601	)		$	22.96
	Forfeited or expired	(208	)		$	36.17
	Outstanding at March 31, 2015	6,841			$	37.4			4.24	$	48,057
	Exercisable at March 31, 2015	3,950			$	36.99			3.41	$	30,817
	Restricted Stock Unit Activity
	A summary of RSU activity, excluding PRSUs, through March 31, 2015 is presented below (in thousands, except per share amounts):
					Weighted-
					Average
		Number of			Grant Date
		Shares			Fair Value
	Outstanding at December 31, 2014	2,513			—
	Awarded	835			$	42.5
	Released	(167	)		$	40.3
	Forfeited	(129	)		$	37.6
	Outstanding at March 31, 2015	3,052			—
	Performance-Based Restricted Stock Unit Activity
	During the first quarter of 2015, the Company granted approximately 237,000 target PRSUs.
	•	Approximately 149,000 of these PRSUs have a performance period that is the 2015 fiscal year. If certain performance goals are met, PRSUs would become eligible to vest, and vest ratably over four years on the annual anniversary dates of the vesting commencement date, contingent upon the recipient’s continued service to the company. Certain participants have the ability to receive up to 125% of the target number of shares originally granted. The Compensation Committee of the Board of Directors will certify actual performance achievement for these PRSUs in the first quarter of 2016. The weighted-average grant date fair value of these PRSUs was $43.06 per share.
	•	Approximately 88,000 of these PRSUs have a performance period that is the three year period beginning with January 1, 2015 through December 31, 2017 with certain revenue based performance goals and the achievement of an objective relative total stockholder return against other companies in the S&P Software & Services Select Index measured over a three-year performance period. Participants have the ability to receive up to 188% of the target number of shares originally granted. The Compensation Committee of the Board of Directors will certify actual performance achievement for these PRSUs in the first quarter of 2018, after which they will vest immediately in full. The weighted-average grant date fair value of 2015 PRSUs was $46.93 per share, which was determined using a Monte Carlo simulation model.
	During the first quarter of 2014, the Company granted approximately 223,000 target PRSUs. The performance period for the PRSUs granted in 2014 was the 2014 fiscal year. In the first quarter of 2015, the Compensation Committee of the Board of Directors certified actual performance achievement for PRSUs granted in 2014, and as a result, 138,000 shares became eligible to vest. The achieved PRSUs vest ratably over two or four years on the annual anniversary dates of the grant, contingent upon the recipient’s continued service to the Company. Certain participants had the ability to receive up to 125% to 150% of the target number of shares originally granted. The weighted-average grant date fair value of PRSUs granted in 2014 was $38.25 per share.
A summary of PRSU activity based upon PRSUs granted in 2013 and 2014, certified and actually achieved through the three months ended March 31, 2015 is presented below (in thousands):
	Number of
	Shares
Outstanding at December 31, 2014	306
Achieved	138
Released	(136	)
Forfeited	(20	)
Outstanding at March 31, 2015	288
The fair value of PRSUs released during the three months ended March 31, 2015 was approximately $5.1 million.
A summary of PRSU activity through the three months ended March 31, 2015 for awards that have not been certified by the Compensation Committee of the Board of Directors as achieved is presented below (in thousands):
	Number of
	Shares
Outstanding at December 31, 2014	—
Granted	237
Forfeited	(2	)
Outstanding at March 31, 2015	235
As of March 31, 2015, there were approximately 523,000 unvested PRSUs with a fair value of $21.3 million.

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes
	The Company's effective tax rates were 35% and 34% for the three months ended March 31, 2015 and 2014, respectively. The rates for the three months ended March 31, 2015 were similar to the federal statutory rate of 35% as the benefits of foreign earnings in lower-tax jurisdictions and the domestic manufacturing deduction were offset by nondeductible stock-based compensation, state income taxes, and the accrual of reserves related to uncertain tax positions. The tax rates for both periods do not include the federal research and development tax credit benefit as the credit was not reinstated for the respective interim periods.
	The Company is a U.S.-based multinational corporation subject to tax in various U.S. and foreign tax jurisdictions. This causes the Company's effective tax rate to be sensitive to its geographic mix of earnings. The geographic mix of earnings is impacted by the fluctuation in currency exchange rates between the U.S. dollar and the functional currencies of the Company's foreign subsidiaries. The Company's results of operations will continue to be adversely affected to the extent that its geographic mix of earnings becomes more weighted toward jurisdictions with higher tax rates, and will be favorably affected to the extent the relative geographic mix shifts to lower tax jurisdictions. As of March 31, 2015, the Company has not provided for residual U.S. taxes in any of these lower-tax jurisdictions since it intends to indefinitely reinvest the net undistributed earnings of its foreign subsidiaries offshore.
	ASC 740, Income Taxes, provides for the recognition of deferred tax assets if realization of such assets is more likely than not. In assessing the need for any additional valuation allowance in the quarter ended March 31, 2015, the Company considered all available evidence both positive and negative, including historical levels of income, legislative developments, expectations and risks associated with estimates of future taxable income, and ongoing prudent and feasible tax planning strategies.
	As a result of this analysis for the quarter ended March 31, 2015, consistent with prior periods, it was considered more likely than not that the Company's deferred tax assets would be realized except for any increase to the deferred tax assets related to the California research and development credit and certain operating losses incurred outside of the United States. A valuation allowance has been recorded against this portion of the state tax credit, even though this attribute has an indefinite life. In addition, the Company recorded a valuation allowance related to the deferred tax assets attributable to certain operating losses incurred outside of the United States.
	The unrecognized tax benefits related to ASC 740, if recognized, would impact the income tax provision by $27.6 million and $27.1 million as of March 31, 2015 and 2014, respectively. The Company has elected to include interest and penalties as a component of income tax expenses. Accrued interest and penalties as of March 31, 2015 and 2014 were approximately $2.1 million and $2.3 million, respectively. As of March 31, 2015, the gross unrecognized tax benefit was approximately $35.9 million.
	The Company files U.S. federal income tax returns as well as income tax returns in various states and foreign jurisdictions. The Company has been informed by certain state and foreign taxing authorities that it was selected for examination. Most state and foreign jurisdictions have three to six open tax years at any point in time. The field work for certain state and foreign audits have commenced and are at various stages of completion as of March 31, 2015.
	Although the outcome of any tax audit is uncertain, the Company believes that it has adequately provided in its financial statements for any additional taxes that it may be required to pay as a result of these examinations. The Company regularly assesses the likelihood of outcomes resulting from these examinations to determine the adequacy of its provision for income taxes and believes its current reserve to be reasonable. If tax payments ultimately prove to be unnecessary, the reversal of these tax liabilities would result in tax benefits in the period that the Company had determined such liabilities were no longer necessary. However, if an ultimate tax assessment exceeds its estimate of tax liabilities, an additional tax provision might be required.

Net_Income_per_Common_Share

Net Income per Common Share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Net Income per Common Share	Net Income per Common Share
	The following table sets forth the calculation of basic and diluted net income per share for the three months ended March 31, 2015 and 2014 (in thousands, except per share amounts):
		Three Months Ended
		March 31,
		2015		2014
	Net income	$	21,557	$	24,853
	Weighted-average shares of common stock used to compute basic net income per share (excluding unvested restricted stock)	105,928		109,164
	Effect of dilutive common stock equivalents:
	Dilutive effect of unvested restricted stock units	928		654
	Dilutive effect of employee stock options	568		2,117
	Shares used in computing diluted net income per common share	107,424		111,935
	Basic net income per common share	$	0.2	$	0.23
	Diluted net income per common share	$	0.2	$	0.22
	Weighted average stock options and restricted stock units excluded from calculation due to anti-dilutive effect	3,898		4,653

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies
	Lease Obligations
	The Company leases certain office facilities under various non-cancelable operating leases, which expire at various dates through 2024 and require the Company to pay operating costs, including property taxes, insurance, and maintenance.
	Future minimum lease payments as of March 31, 2015 under non-cancelable operating leases with original terms in excess of one year are summarized as follows (in thousands):
		Operating
		Leases
	Remaining 2015	$	8,634
	2016	9,504
	2017	8,102
	2018	7,511
	2019	6,003
	Thereafter	8,034
	Total future minimum operating lease payments	$	47,788
	Warranties
	The Company generally provides a warranty for its software products and services to its customers for a period of three to six months. The Company’s software products’ media are generally warranted to be free from defects in materials and workmanship under normal use, and the products are also generally warranted to substantially perform as described in certain Company documentation and the product specifications. The Company’s services are generally warranted to be performed in a professional manner and to materially conform to the specifications set forth in a customer’s signed contract. In the event there is a failure of such warranties, the Company generally will correct or provide a reasonable work-around or replacement product. To date, the Company’s product warranty expense has not been significant. The warranty accrual as of March 31, 2015 and December 31, 2014 was not material.
	Indemnification
	The Company's software license agreements generally include certain provisions for indemnifying the customer against losses, expenses, liabilities, and damages that may be awarded against the customer in the event the Company’s software is found to infringe upon a patent, copyright, trademark, or other proprietary right of a third party. The agreements generally limit the scope of and remedies for such indemnification obligations in a variety of industry-standard respects, including but not limited to certain time and scope limitations and a right to replace an infringing product with a non-infringing product.
	The Company believes its internal development processes and other policies and practices limit its exposure related to these indemnification provisions. In addition, the Company requires its employees to sign a proprietary information and inventions agreement, which assigns the rights to its employees’ development work to the Company. To date, the Company has not had to reimburse any of its customers for any losses related to these indemnification provisions, and no material claims against the Company are outstanding as of March 31, 2015. The Company cannot determine the maximum amount of potential future payments, if any, related to such indemnification provisions due to the limited and infrequent history of prior indemnification claims.
	As permitted under Delaware law, the Company has agreements whereby the Company indemnifies its officers and directors for certain events or occurrences while the officer or director is, or was serving, at our request, in such capacity. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is unlimited; however, the Company has director and officer insurance coverage that reduces the Company's exposure and enables the Company to recover a portion of any future amounts paid. The Company believes the estimated fair value of these indemnification agreements in excess of applicable insurance coverage is minimal.
	The Company accrues for loss contingencies when available information indicates that it is probable that an asset has been impaired or a liability has been incurred and the amount of the loss can be reasonably estimated in accordance with ASC 450, Contingencies.
	Derivative Financial Instruments
	The Company uses derivative instruments to manage its exposure to fluctuations in certain foreign currency exchange rates which exist as part of ongoing business operations. See Note 1. Summary of Significant Accounting Policies, Note 5. Accumulated Other Comprehensive Income (Loss), and Note 6. Derivative Financial Instruments of Notes to Condensed Consolidated Financial Statements in Part I, Item 1 of this Report for a further discussion.
	Litigation
	The Company is a party to various legal proceedings and claims arising from the normal course of its business activities, including proceedings and claims related to patents and other intellectual property related matters. The Company reviews the status of each matter and records a provision for a liability when it is considered both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. These provisions are reviewed quarterly and adjusted as additional information becomes available. If both of the criteria are not met, the Company assesses whether there is at least a reasonable possibility that a loss, or additional losses, may be incurred. If there is a reasonable possibility that a material loss may be incurred, the Company discloses the estimate of the possible loss, range of loss, or a statement that such an estimate cannot be made.
	Litigation is subject to inherent uncertainties. Were an unfavorable outcome to occur, there exists the possibility of a material adverse impact on the Company's financial position and results of operation for the period in which the unfavorable outcome occurred, and potentially in future periods. See Note 14. Subsequent Events of Notes to Condensed Consolidated Financial Statements in Part I, Item 1 of this Report.

Significant_Customer_Informati

Significant Customer Information and Segment Information	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Significant Customer Information and Segment Information	Significant Customer Information and Segment Information
	The Company is organized and operates in a single segment:  the design, development, marketing, and sales of software solutions. The Company’s chief operating decision maker is its Chief Executive Officer, who reviews financial information presented on a consolidated basis for purposes of making operating decisions and assessing financial performance. The Company markets its products and services in the United States and in foreign countries through its direct sales force and indirect distribution channels.
	No customer accounted for more than 10% of revenue in the three months ended March 31, 2015 and 2014. At March 31, 2015 and December 31, 2014, no customer accounted for more than 10% of the accounts receivable balance. North America revenues include the United States and Canada. Revenue from international customers (defined as those customers outside of North America) accounted for 35% and 37% of total revenues in the first quarter of 2015 and 2014, respectively.
	Total revenue by geographic region is summarized as follows (in thousands):
		Three Months Ended
		March 31,
		2015		2014
	Revenues:
	North America	$	163,874	$	153,844
	Europe, the Middle East, and Africa	56,705		60,202
	Other	29,957		29,051
	Total revenues	$	250,536	$	243,097
	Property and equipment, net by geographic region are summarized as follows (in thousands):
		March 31,		December 31,
		2015		2014
	Property and equipment, net:
	North America	$	141,803	$	143,482
	Europe, the Middle East, and Africa	9,058		10,902
	Other	4,838		5,324
	Total property and equipment, net	$	155,699	$	159,708

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Acquisitions	Acquisitions
	Acquisition in Fiscal Year 2014:
	Proact Business Transformation Inc.
	In November 2014, the Company acquired assets of Proact Business Transformation Inc. (“Proact”) for $4.0 million in cash. Proact provides enterprise architecture business transformation solutions including frameworks, methods, and industry reference models to assist with strategic planning of clients' information technology needs. The purchase was accounted for using the acquisition method. Total assets acquired were approximately $4.0 million of which approximately $2.7 million and $1.3 million was allocated to goodwill and identifiable intangible assets, respectively. The goodwill is deductible for tax purposes.
	StrikeIron
	In June 2014, the Company acquired all outstanding shares of StrikeIron, Inc. (“StrikeIron”), for aggregate consideration of approximately $54.6 million. StrikeIron provides cloud-based data-as-a-service for email and contact validation, and will enable the Company to enhance its cloud-based product portfolio. The goodwill is not deductible for tax purposes.
	Approximately $8.3 million of the consideration otherwise payable to former StrikeIron stockholders was placed into an escrow fund and held as partial security for the indemnification obligations of the former StrikeIron stockholders. The escrow fund will remain in place until September 2015.
	The following table summarizes the fair value of assets acquired and liabilities assumed of $50.5 million and the acquiree's transaction related costs and debt settlement of $4.1 million, which were paid by the Company (in thousands):
	Assumed liabilities, net of assets	$	(3,499	)
	Identifiable intangible assets:
	Developed and core technology	13,900
	Customer relationships	3,500
	Covenants not to compete	450
	Trade names	40
	Total identifiable net assets	14,391
	Goodwill	36,116
	Total assets acquired and liabilities assumed	50,507
	Acquiree's transaction related costs and debt settlement	4,138
	Total	$	54,645

Subsequent_Events

Subsequent Events	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events
	Merger Agreement
	On April 6, 2015, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Italics Inc. (“Newco”) and Italics Merger Sub Inc., a wholly owned subsidiary of Newco (“Merger Sub”), providing for the merger of Merger Sub with and into the Company (the “Merger”), with the Company surviving the Merger as a wholly owned subsidiary of Newco.
	At the effective time of the Merger, each share of the Company’s common stock issued and outstanding as of immediately prior to the effective time, subject to certain exceptions, will be canceled and extinguished and automatically converted into the right to receive cash in an amount equal to $48.75, without interest thereon. Generally, all outstanding employee stock options immediately before the effective date of the transaction will be canceled and converted into a right to receive an amount in cash equal to $48.75 per stock option, without interest, less the exercise price. All stock options with an exercise price greater than $48.75 will be canceled without payment. Generally, the performance and market conditions for the PRSUs granted during 2015 will be deemed achieved at 100% of the applicable target levels unless the applicable agreements governing the PRSUs specify a greater level of achievement, in which case this greater number of PRSUs will be deemed achieved. All vested RSUs and vested PRSUs (as determined by the Merger Agreement) will be canceled and converted into a right to receive cash in an amount equal to $48.75 per RSU and PRSU, without interest. Generally, the remaining unvested RSUs and PRSUs will be assumed and converted to a right to receive cash equal to $48.75 per award subject to continued employment through the accelerated vesting period. For purposes of the unvested RSUs and PRSUs, each vest date underlying the applicable awards will be accelerated by 12 months. The Company will terminate the current ESPP purchase period on the effective time of the Merger Agreement. The current ESPP purchase period, which is otherwise scheduled to end July 31, 2015, will continue until the earlier of July 31, 2015 or immediately before the effective date of the transaction, and each participant's accumulated payroll deductions shall be used to purchase the Company's common stock in accordance with the terms of the ESPP; such shares shall be treated the same as all other common shares. No further purchase periods will commence under the ESPP on or following April 6, 2015. See Note 8. Stock-Based Compensation of Notes to Condensed Consolidated Financial Statements in Part I, Item 1 of this Report.
	Newco and Merger Sub have secured committed financing, consisting of a combination of equity to be provided by the Canada Pension Plan Investment Board (“CPPIB”) and investment funds (the “Permira Funds”) advised by Permira Advisers LLC and debt financing from BofA Merrill Lynch, Goldman Sachs, Credit Suisse, Macquarie Capital, Morgan Stanley, Nomura, RBC and Deutsche Bank, the aggregate proceeds of which, together with the Company’s available cash, cash equivalents or marketable securities will be sufficient for Newco and Merger Sub to pay the aggregate merger consideration and all related fees and expenses.  Newco and Merger Sub have committed to use their reasonable best efforts to obtain the debt financing on the terms and conditions described in the debt commitment letter entered into as of April 6, 2015. The transaction is not subject to a financing condition.
	Consummation of the Merger is subject to customary closing conditions, including, without limitation, the absence of certain legal impediments, the expiration or termination of the required waiting periods under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, antitrust regulatory approval in the European Union, Turkey, Russia and Israel, the receipt of written notice from the Committee on Foreign Investment in the United States that it has concluded its review of the joint voluntary notice that will be made by the parties to the Merger Agreement pursuant to Section 721 of the Defense Production Act, as amended, with a determination that there are no unresolved national security concerns with respect to the transaction contemplated by the Merger Agreement, and approval by the Company’s stockholders.
	The Company has made customary representations and warranties in the Merger Agreement and have agreed to customary covenants regarding the operation of the Company’s business prior to the effective time of the Merger. The Company is also subject to customary restrictions on its ability to solicit alternative acquisition proposals from third parties and to provide non-public information to, and participate in discussions and engage in negotiations with, third parties regarding alternative acquisition proposals, with customary exceptions for a Superior Proposal (as such term is defined in the Merger Agreement).
	The Merger Agreement contains certain termination rights for the Company and Newco. Under specified circumstances, the Company will be required to pay Newco a termination fee of $160 million. This fee will become payable by the Company, in each case subject to the terms and conditions of the Merger Agreement, if before receiving stockholder approval of the Merger the Company terminates the Merger Agreement in connection with a competing acquisition transaction or Newco terminates the Merger Agreement in connection with a breach of covenant by the Company that would cause a failure of our closing conditions to be satisfied, in each case a competing acquisition transaction has been publicly announced, and within one year of termination the Company completes a competing acquisition transaction, or enters into an agreement for a competing acquisition transaction that is subsequently consummated, the Company terminates the Merger Agreement to take a Superior Proposal, or Newco terminates the Merger Agreement in connection with the Company’s board of directors failing to make, or withdrawing, its recommendation of the Merger.
	Under other specified circumstances, Newco will be required to pay the Company a termination fee of $320 million.  This fee will become payable by Newco, in each case subject to the terms and conditions of the Merger Agreement, if the Company terminates the Merger Agreement, provided that Newco is not permitted to terminate the Merger Agreement at such time, in connection with a breach by Newco that would cause a failure of Newco’s closing conditions to be satisfied, or if the Company terminates the Merger Agreement in connection with the Termination Date (as defined below), and at the time of termination we would have been entitled to terminate due to Newco’s breach such that Newco’s closing conditions would not be satisfied or due to Newco’s failure to close the Merger notwithstanding the satisfaction of our closing conditions and Newco’s obligation to close.
	CPPIB and the Permira Funds have provided the Company with a fee funding agreement in favor of Informatica (the “Fee Funding Agreement”). In the aggregate, the Fee Funding Agreement guarantees the payment of the termination fee payable by Newco, any interest that may be due thereon and certain reimbursement obligations that may be owed by Newco to the Company pursuant to the Merger Agreement.  The Merger Agreement also provides that either party may specifically enforce the other party’s obligations under the Merger Agreement, provided that the Company may only cause Newco to fund the equity financing if certain conditions are satisfied, including the funding or availability of the debt financing at closing.
	In addition to the foregoing termination rights, and subject to certain limitations, the Company or Newco may terminate the Merger Agreement if the Merger is not consummated on or before the first business day after October 6, 2015 (the “Termination Date”).
	The foregoing description of the Merger Agreement and the transactions contemplated thereby does not purport to be complete and is subject to, and qualified in its entirety by, the full text of such agreement attached as an exhibit to the Current Report on Form 8-K filed with the SEC on April 7, 2015.
	The terms of the Credit Agreement entered into on September 26, 2014 define a change in control as an event of default. At the effective time of the Merger, the lenders are allowed to terminate their commitments under the agreement and declare any then outstanding loans along with the accrued interest and fees to be due and payable immediately in whole or in part. See Note 4. Borrowings of Notes to Condensed Consolidated Financial Statements in Part I, Item 1 of this Report for a further discussion of our Credit Agreement.
	Stockholder Lawsuits
	On April 16, 2015, two stockholder class action complaints were filed in the Court of Chancery of the State of Delaware on behalf of a putative class of the Company’s stockholders: Luciano Scotto v. Sohaib Abbasi et al., Case No. 10913 (filed April 16, 2015) and Janice Ridgeway v. Informatica Corporation et al., Case No. 10917 (filed April 16, 2015).   The complaints generally allege that, in connection with the proposed acquisition of the Company by Newco, the Informatica directors breached their fiduciary duties owed to the Company’s stockholders by agreeing to sell the company for purportedly inadequate consideration, engaging in a flawed sales process, and agreeing to a number of purportedly preclusive deal protection devices.  The complaints further allege that Newco, Merger Sub, the Permira Funds, CPPIB, and the Company aided and abetted the Board of Directors in the alleged breaches of fiduciary duties.  The complaints seek, among other things, an order enjoining the close of the proposed transaction or, in the event that the proposed transaction is consummated, an award of rescission and/or rescissory damages.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation
	The accompanying condensed consolidated financial statements of Informatica Corporation (“Informatica,” or the “Company”) have been prepared in conformity with generally accepted accounting principles (“GAAP”) in the United States of America. However, certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed, or omitted, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). In the opinion of management, the financial statements include all normal and recurring adjustments that are necessary to fairly present the results of the interim periods presented. All of the amounts included in this Quarterly Report on Form 10-Q related to the condensed consolidated financial statements and notes thereto as of March 31, 2015 and for the three months ended March 31, 2015 and 2014 are unaudited. The interim results presented are not necessarily indicative of results for any subsequent interim period, the year ending December 31, 2015, or any other future period. On April 6, 2015, the Company entered into a definitive agreement to be acquired by the Canada Pension Plan Investment Board and investment funds advised by Permira Advisers LLC for $48.75 in cash for each share of our common stock. For further information, see Note 14. Subsequent Events of Notes to Condensed Consolidated Financial Statements in Part I, Item 1 of this Report.
	The preparation of the Company's condensed consolidated financial statements in conformity with GAAP requires management to make certain estimates, judgments, and assumptions. For example, the Company makes estimates, judgments, and assumptions in determining vendor-specific objective evidence ("VSOE") and, estimated selling price ("ESP") used in revenue recognition, the realizability of deferred tax assets, uncertain tax positions, fair value of acquired tangible and intangible assets and liabilities assumed during acquisitions, the number of reporting segments, the recoverability of intangible assets and their useful lives, the fair value of stock options and forfeiture estimates used in calculating stock-based compensations, number of performance-based restricted stock units that the Company expects to vest, and the collectability of accounts receivable. The Company believes that the estimates, judgments, and assumptions upon which it relies are reasonable based on information available at the time that these estimates, judgments, and assumptions are made. These estimates, judgments, and assumptions can affect the reported amounts of assets and liabilities as of the date of the financial statements as well as the reported amounts of revenues and expenses during the periods presented. Any material differences between these estimates and actual results will impact the Company's condensed consolidated financial statements. In many cases, the accounting treatment of a particular transaction is specifically dictated by GAAP and does not require management's judgment in its application. There are also areas in which management's judgment in selecting any available alternative would not produce a materially different result.
	The condensed consolidated financial statements include the accounts of the Company and its wholly-owned and majority-owned subsidiaries. All intercompany accounts and transactions have been eliminated.
	These unaudited, condensed consolidated financial statements should be read in conjunction with the Company's audited consolidated financial statements and notes thereto for the year ended December 31, 2014 included in the Company's Annual Report on Form 10-K, as amended, filed with the SEC. The consolidated balance sheet as of December 31, 2014 has been derived from the audited consolidated financial statements of the Company. The Company's significant accounting policies are described in Note 2 to the audited consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2014.
Reclassifications to Conform to Current Year Presentation	Certain reclassifications have been made within the condensed consolidated statement of cash flows to conform to the current year presentation. A change was made to present redemptions by issuers of debt securities held by the Company as part of net cash provided by maturities of investments to reflect that these redemptions are an acceleration of the maturity of the debt investment. Redemptions were previously presented as part of net cash provided by sales of investments. This change in presentation did not affect total net cash used in investing activities and conforming changes have been made for all prior periods presented.
Recent Accounting Pronouncements	Recent Accounting Pronouncements
	In April 2015, the FASB issued Accounting Standards Update ("ASU") 2015-05, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40), Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement, as part of its simplification initiative and clarifies how customers in cloud computing arrangements should determine whether the arrangement includes a software license. Existing GAAP does not include explicit guidance about a customer's accounting for fees paid in a cloud computing arrangement. This ASU eliminates the current requirement that customers analogize to the leases standard when determining the assets acquired in a software license arrangement. If a cloud computing arrangement includes a software license, then the customer should account for the software licenses element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. As a result of this ASU, all software licenses within the scope of Subtopic 350-40 will be accounted for consistent with other licenses of intangible assets. The ASU is effective for us beginning in 2016, with early adoption permitted. An entity can elect to adopt the ASU either (1) prospectively to all arrangements entered into or materially modified after the effective date; or (2) retrospectively. For prospective transition, the only disclosure requirements at transition are the nature of and reason for the change in accounting principle, the transition method, and a qualitative description of the description of the financial statement line items affected by the change. For retrospective transition, the disclosure requirements at transition include the requirements for prospective transition and quantitative information about the effects of the accounting change. The Company is currently assessing its pending adoption of ASU 2015-05 on its consolidated financial statements and disclosures.
	In April 2015, the FASB issued ASU 2015-03, Interest—Imputation of Interest (Subtopic 835-30), Simplifying the Presentation of Debt Issuance Costs, that requires debt issuance costs related to a recognized debt liability to be presented in the balance sheet as a direct reduction from the debt liability, consistent with debt discounts, rather than as an asset. The recognition and measurement guidance for debt issuance costs is not affected by the amendments in this update. This ASU is part of the FASB's initiative to reduce complexity in accounting standards and is effective for the Company beginning in 2016 and early adoption is permitted. The standard requires full retrospective adoption, meaning the standard is applied to all periods presented. The Company is currently assessing its pending adoption of ASU 2015-03 on its consolidated financial statements and disclosures.
	In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), to supersede nearly all existing revenue recognition guidance under U.S. GAAP. The core principle of ASU 2014-09 is to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those good and services. The standard will be effective for the Company in the first quarter of 2017. ASU 2014-09 allows for two methods of adoption: (a) "full retrospective" adoption, meaning the standard is applied to all periods presented, or (b) "modified retrospective" adoption, meaning the cumulative effect of applying ASU 2014-09 is recognized as an adjustment to the 2017 opening retained earnings balance. Early adoption is not permitted. The Company has not yet selected a transition method and is currently evaluating the impact of its pending adoption of ASU 2014-09 on its consolidated financial statements and disclosures.
	In June 2014, the FASB issued ASU 2014-12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. ASU 2014-12 requires that a performance target that affects vesting and could be achieved after the requisite service period be treated as a performance condition. ASU 2014-12 is effective for the Company in its first quarter of 2016 with early adoption permitted. The Company does not expect its pending adoption of ASU 2014-12 to have a material impact on its consolidated financial statements and disclosures.
	In August 2014, the FASB issued ASU 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern, to provide guidance on management’s responsibility in evaluating whether there is substantial doubt about a company’s ability to continue as a going concern and to provide related footnote disclosures. ASU 2014-15 is effective for the Company in the first quarter of 2017 with early adoption permitted. The Company does not expect its pending adoption of ASU 2014-15 to have an impact on the consolidated financial statements and disclosures.
Fair Value Measurement of Financial Assets and Liabilities	Money Market Funds, Time Deposits, and Marketable Debt Securities
	The Company uses a market approach for determining the fair value of all its Level 1 and Level 2 money market funds, time deposits, and marketable securities. The Company's marketable securities consist of certificates of deposit, commercial paper, corporate notes and bonds, municipal securities, and U.S. government and agency notes and bonds.
	To value its money market funds and time deposits, the Company values the funds at $1 stable net asset value, which is the market pricing convention for identical assets that the Company has the ability to access. To value its certificates of deposit and commercial paper, the Company uses mathematical calculations to arrive at fair value for these securities, which generally have short maturities and infrequent secondary market trades. For example, in the absence of any observable transactions, the Company may accrete from purchase price at purchase date to face value at maturity. In the event that a transaction is observed on the same security in the marketplace, and the price on that subsequent transaction clearly reflects the market price on that day, the Company will adjust the price in the system to the observed transaction price and follow a revised accretion schedule to determine the daily price.
	To determine the fair value of its corporate notes and bonds, municipal securities, and U.S. government and agency notes and bonds, the Company uses a third party pricing source for each security. If the market price is not available from the third party source, pricing from the Company's investment custodian is used.
	Foreign Currency Derivatives and Hedging Instruments
	The Company uses the income approach to value the derivatives using observable Level 2 market inputs at the measurement date and standard valuation techniques to convert future amounts to a single present value amount, assuming that participants are motivated but not compelled to transact. Level 2 inputs are limited to quoted prices that are observable for the derivative assets and liabilities. The Company records its derivative assets and liabilities at gross in the condensed consolidated balance sheet and uses mid-market pricing as a practical expedient for fair value measurements. Key inputs for foreign currency derivatives are the spot rates, forward rates, interest rates, and credit derivative market rates. The spot rate for each foreign currency is the same spot rate used for all balance sheet translations at the measurement date and is sourced from the Federal Reserve Bulletin. The following values are interpolated from commonly quoted intervals available from Bloomberg: forward points and the London Interbank Offered Rate (“LIBOR”) used to discount and determine the fair value of assets and liabilities. Credit default swap spread curves identified per counterparty at month end in Bloomberg are used to discount derivative assets for counterparty non-performance risk, all of which have terms of twelve months or less. The Company discounts derivative liabilities to reflect the Company’s own potential non-performance risk to lenders and has used the spread over LIBOR on its most recent corporate borrowing rate.
	The counterparties associated with the Company’s foreign currency forward contracts are large credit-worthy financial institutions, and the derivatives transacted with these entities are relatively short in duration; therefore, the Company does not consider counterparty concentration and non-performance to be material risks at this time. Both the Company and the counterparties are expected to perform under the contractual terms of the instruments.
Marketable Securities, Available-for-sale Securities, Policy [Policy Text Block]	The cost of securities sold was determined based on the specific identification method.
Derivatives, Offsetting Fair Value Amounts, Policy	The Company presents its derivative assets and derivative liabilities at gross fair values in the condensed consolidated balance sheets. However, under the master netting agreements with the respective counterparties of the foreign exchange contracts, subject to applicable requirements, the Company is allowed to net settle transactions of the same currency with a single net amount payable by one party to the other. The derivatives held by the Company are not subject to any credit contingent features negotiated with its counterparties. The Company is not required to pledge nor is entitled to receive cash collateral related to the above contracts.
Derivatives, Methods of Accounting, Hedge Effectiveness	The Company evaluates prospectively as well as retrospectively the effectiveness of its hedge programs using statistical analysis. Prospective testing is performed at the inception of the hedge relationship and quarterly thereafter. Retrospective testing is performed on a quarterly basis.
Stock-Based Compensation	The Company grants stock options, restricted stock units (“RSUs”) and performance-based restricted stock units (“PRSUs”) under its 2009 Equity Incentive Plan. Eligible employees may elect to purchase shares of common stock through the Employee Stock Purchase Plan ("ESPP"). The fair value of each option award and ESPP share is estimated on the date of grant using the Black-Scholes-Merton option pricing model that uses the assumptions in the following table. The Company has consistently used a blend of average historical and market-based implied volatilities for calculating the expected volatilities for employee stock options, and uses market-based implied volatilities for its ESPP. The expected term of employee stock options granted is derived from historical exercise patterns of the options, and the expected term of ESPP is based on the contractual terms. The expected term of options granted to employees is derived from the historical option exercises, post-vesting cancellations, and estimates concerning future exercises and cancellations for vested and unvested options that remain outstanding. The risk-free interest rate for the expected term of the option and ESPP is based on the U.S. Treasury yield curve in effect at the time of grant. The Company recognizes its stock-based compensation related to options using a straight-line method over the vesting term of the awards. The Company recognizes its stock-based compensation related to ESPP using a straight-line method over the offering period, which is six months.
	The fair value of RSUs is the grant date closing price of our common stock. Beginning in the first quarter of 2015, the Company granted two types of PRSUs. The fair value of PRSUs, with service and performance conditions, is the grant date closing price of our common stock. The grant date fair value of the PRSUs requiring the satisfaction of service, performance, and market conditions was determined by using a Monte Carlo simulation model, which utilized multiple input variables that determined the probability of satisfying the market condition requirements. The Company recognizes expense related to RSUs using a straight-line method over the vesting term of the awards. The Company recognizes expense for PRSUs, with service and performance conditions, based on the probability of achieving the performance criteria, as defined in the PRSU agreements. The Company recognizes expense for PRSUs with service, performance, and market conditions based on the probability of achieving the performance conditions as long as the requisite service is rendered, even if the market conditions are not met. PRSUs are expensed using the graded vesting attribution method over the requisite service period.
	The Company records stock-based compensation for options, RSUs and PRSUs granted net of estimated forfeiture rates. ASC 718, Stock Compensation, requires the Company to estimate forfeiture rates at the time of grant and revise those estimates in subsequent periods if actual forfeitures differ from those estimates. The Company uses historical forfeitures to estimate its future forfeiture rates.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table summarizes financial assets and financial liabilities that the Company measures at fair value on a recurring basis as of March 31, 2015 (in thousands):
				Quoted		Significant		Significant
				Prices in		Other		Unobservable
				Active		Observable		Inputs
				Markets for		Inputs		(Level 3)
				Identical		(Level 2)
		Total		Assets
				(Level 1)
	Assets:
	Money market funds (i)	$	1,369	$	1,369	$	—	$	—
	Time deposits (ii)	21,773		21,773		—		—
	Marketable debt securities (ii)	223,705		—		223,705		—
	Total money market funds, time deposits, and marketable debt securities	246,847		23,142		223,705		—
	Foreign currency derivatives (iii)	555		—		555		—
	Total assets	$	247,402	$	23,142	$	224,260	$	—
	Liabilities:
	Foreign currency derivatives (iv)	$	204	$	—	$	204	$	—
	Total liabilities	$	204	$	—	$	204	$	—
	The following table summarizes financial assets and financial liabilities that the Company measures at fair value on a recurring basis as of December 31, 2014 (in thousands):
				Quoted
				Prices in		Significant
				Active		Other		Significant
				Markets for		Observable		Unobservable
				Identical		Inputs		Inputs
		Total		Assets		(Level 2)		(Level 3)
				(Level 1)
	Assets:
	Money market funds (i)	$	15,344	$	15,344	$	—	$	—
	Time deposits (ii)	26,395		26,395		—		—
	Marketable debt securities (ii)	326,735		—		326,735		—
	Total money market funds, time deposits, and marketable debt securities	368,474		41,739		326,735		—
	Foreign currency derivatives (iii)	310		—		310		—
	Total assets	$	368,784	$	41,739	$	327,045	$	—
	Liabilities:
	Foreign currency derivatives (v)	$	915	$	—	$	915	$	—
	Total liabilities	$	915	$	—	$	915	$	—
	____________________
	(i)	Included in cash and cash equivalents on the condensed consolidated balance sheets.
	(ii)	Included in either cash and cash equivalents or short-term investments on the condensed consolidated balance sheets.
	(iii)	Included in prepaid expenses and other current assets on the condensed consolidated balance sheets.
	(iv)	Included in accrued liabilities on the consolidated balance sheets.
	(v)	Included in accrued liabilities and other liabilities on the consolidated balance sheets.

Cash_Cash_Equivalents_and_Shor1

Cash, Cash Equivalents, and Short-Term Investments (Tables)	3 Months Ended
	Mar. 31, 2015
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Schedule of Cash, Cash Equivalents and Short-term Investments [Table Text Block])	The following table summarizes the Company’s cash, cash equivalents, and short-term investments as of March 31, 2015 (in thousands):
				Gross			Gross			Estimated
		Cost		Unrealized			Unrealized			Fair Value
				Gains			Losses
	Cash	$	251,867	$	—		$	—		$	251,867
	Cash equivalents:
	Money market funds	1,369		—			—			1,369
	Commercial Paper	4,000		—			—			4,000
	Total cash equivalents	5,369		—			—			5,369
	Total cash and cash equivalents	257,236		—			—			257,236
	Short-term investments:
	Certificates of deposit	1,920		—			—			1,920
	Commercial paper	8,992		—			—			8,992
	Corporate notes and bonds	114,165		157			(86		)	114,236
	Federal agency notes and bonds	29,072		35			(6		)	29,101
	Time deposits	21,773		—			—			21,773
	Municipal notes and bonds	65,363		98			(5		)	65,456
	Total short-term investments	241,285		290			(97		)	241,478
	Total cash, cash equivalents, and short-term investments	$	498,521	$	290		$	(97	)	$	498,714
	The following table summarizes the Company’s cash, cash equivalents, and short-term investments as of December 31, 2014 (in thousands):
				Gross			Gross			Estimated
		Cost		Unrealized			Unrealized			Fair Value
				Gains			Losses
	Cash	$	353,187	$	—		$	—		$	353,187
	Cash equivalents:
	Money market funds	15,344		—			—			15,344
	Total cash equivalents	15,344		—			—			15,344
	Total cash and cash equivalents	368,531		—			—			368,531
	Short-term investments:
	Certificates of deposit	1,920		—			—			1,920
	Commercial paper	1,996		—			—			1,996
	Corporate notes and bonds	196,401		84			(371		)	196,114
	Federal agency notes and bonds	51,987		13			(44		)	51,956
	Time deposits	26,395		—			—			26,395
	Municipal notes and bonds	74,639		128			(18		)	74,749
	Total short-term investments	353,338		225			(433		)	353,130
	Total cash, cash equivalents, and short-term investments	$	721,869	$	225		$	(433	)	$	721,661
Available-for-sale Securities Continuous Unrealized Loss Position, Fair Value [Table Text Block]	The following table summarizes the fair value and gross unrealized losses related to the Company’s short-term investments, aggregated by investment category that have been in a continuous unrealized loss position for less than twelve months, at March 31, 2015 (in thousands):
		Less Than 12 months
				Gross
		Fair		Unrealized
		Value		Losses
	Corporate notes and bonds	$	32,411	$	(83	)
	Federal agency notes and bonds	12,009		(6		)
	Municipal notes and bonds	6,542		(5		)
	Total	$	50,962	$	(94	)
	The following table summarizes the fair value and gross unrealized losses related to the Company’s short-term investments, aggregated by investment category that have been in a continuous unrealized loss position for greater than twelve months, at March 31, 2015 (in thousands):
		Greater Than 12 months
				Gross
		Fair		Unrealized
		Value		Losses
	Corporate notes and bonds	$	1,026	$	(3	)
	Total	$	1,026	$	(3	)
Investments Classified by Contractual Maturity Date [Table Text Block]	The following table summarizes the cost and estimated fair value of the Company’s short-term investments by contractual maturity at March 31, 2015 (in thousands):
		Cost		Fair
				Value
	Due within one year	$	152,265	$	152,363
	Due in one year to two years	66,507		66,541
	Due after two years	22,513		22,574
	Total	$	241,285	$	241,478

Intangible_Assets_and_Goodwill1

Intangible Assets and Goodwill (Tables)	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets	The carrying amounts of the intangible assets other than goodwill as of March 31, 2015 and December 31, 2014 are as follows (in thousands, except years):
		March 31, 2015								December 31, 2014							Weighted
																	Average
																	Useful Life
		Cost			Accumulated			Net		Cost		Accumulated			Net		(Years)
					Amortization							Amortization
	Developed and core technology	$	145,875		$	(114,919	)	$	30,956	$	145,929	$	(112,169	)	$	33,760	6
	Other Intangible Assets:
	Customer relationships	45,177			(40,659		)	4,518		45,178		(39,766		)	5,412		5
	All other (i)	19,145			(15,354		)	3,791		19,145		(15,156		)	3,989		9-Apr
	Total other intangible assets	64,322			(56,013		)	8,309		64,323		(54,922		)	9,401
	Total intangible assets, net	$	210,197		$	(170,932	)	$	39,265	$	210,252	$	(167,091	)	$	43,161
	____________________
	(i)	All other includes vendor relationships, trade names, covenants not to compete, and patents.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	As of March 31, 2015, the amortization expense related to identifiable intangible assets in future periods is expected to be as follows (in thousands):
		Acquired			Other			Total
		Technology			Intangible			Intangible
					Assets (ii)			Assets
	Remaining 2015	$	7,615		$	3,210		$	10,825
	2016	8,883			2,449			11,332
	2017	6,870			1,152			8,022
	2018	4,756			729			5,485
	2019	2,331			449			2,780
	Thereafter	501			320			821
	Total expected amortization expense	$	30,956		$	8,309		$	39,265
	____________________
	(ii)	Other Intangible Assets includes customer relationships, vendor relationships, trade names, covenants not to compete, and patents.
Schedule of Goodwill	The changes in the carrying amount of goodwill for the three months ended March 31, 2015 are as follows (in thousands):
		March 31,
		2015
	Beginning balance as of December 31, 2014	$	551,196
	Goodwill from acquisition	—
	Subsequent goodwill adjustments	(8,471		)
	Ending balance as of March 31, 2015	$	542,725

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table summarizes the changes in accumulated balances for each component of other comprehensive income (loss) for the three months ended March 31, 2015, net of taxes (in thousands):
			Cumulative			Net Unrealized				Net Unrealized				Total
			Translation			Gain (Loss) on				Gain (Loss) on
			Adjustments			Available-for-Sale				Cash Flow Hedges
						Investments
	Accumulated other comprehensive loss as of December 31, 2014		$	(31,312	)	$	(129	)		$	(348	)		$	(31,789	)
	Other comprehensive income (loss):
	Other comprehensive income (loss) before reclassifications, net of tax benefit (expense) of $1,560, $(155) and $(476)		(17,003		)	251				771				(15,981		)
	Net gain reclassified from accumulated other comprehensive income (loss), net of tax expense of $ —, $(2) and $(137)		—			(3		)	(i)	(221		)	(ii)	(224		)
	Total other comprehensive income (loss), net of tax effect (iii)		(17,003		)	248				550				(16,205		)
	Accumulated other comprehensive income (loss) as of March 31, 2015		$	(48,315	)	$	119			$	202			$	(47,994	)
	____________________
	(i)	The before-tax gain of $5 was included in other expense, net on the condensed consolidated statements of income.
	(ii)	The before-tax gain of $87 and $271 were included in cost of service revenues and operating expenses, primarily research and development expense, respectively on the condensed consolidated statements of income.
	(iii)	The tax expense related to the net gain reclassified from accumulated other comprehensive income (loss) was included in income tax provision on the condensed consolidated statements of income.
	The following table summarizes the changes in accumulated balances for each component of other comprehensive income (loss) for the three months ended March 31, 2014, net of taxes (in thousands):
			Cumulative			Net Unrealized				Net Unrealized				Total
			Translation			Gain (Loss) on				Loss on
			Adjustments			Available-for-Sale				Cash Flow Hedges
						Investments
	Accumulated other comprehensive income (loss) as of December 31, 2013		$	(2,879	)	$	63			$	(396	)		$	(3,212	)
	Other comprehensive income (loss):
	Other comprehensive income before reclassifications, net of tax expense of $(161), $(57) and $(550)		569			93				898				1,560
	Net (gain) loss reclassified from accumulated other comprehensive income (loss), net of tax benefit (expense) of $ —, $(1) and $185		—			(2		)	(i)	301			(ii)	299
	Total other comprehensive income (loss), net of tax effect (iii)		569			91				1,199				1,859
	Accumulated other comprehensive income (loss) as of March 31, 2014		$	(2,310	)	$	154			$	803			$	(1,353	)
	____________________
	(i)	The before-tax loss of $3 was included in other expense, net on the condensed consolidated statements of income.
	(ii)	The before-tax losses of $120 and $366 were included in cost of service revenues and operating expenses, primarily research and development expense, respectively on the condensed consolidated statements of income.
	(iii)	The tax benefit related to the net loss reclassified from accumulated other comprehensive income (loss) was included in income tax provision on the condensed consolidated statements of income.

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The following table reflects the fair value amounts for the foreign exchange contracts designated and not designated as hedging instruments at March 31, 2015 and December 31, 2014 (in thousands):
		March 31, 2015						December 31, 2014
		Fair Value			Fair Value			Fair Value		Fair Value
		Derivative			Derivative			Derivative		Derivative
		Assets(i)			Liabilities(ii)			Assets(i)		Liabilities(iii)
	Derivatives designated as hedging instruments	$	385		$	14		$	141	$	761
	Derivatives not designated as hedging instruments	170			190			169		154
	Total fair value of derivative instruments	$	555		$	204		$	310	$	915
	____________________
	(i)	Included in prepaid expenses and other current assets on the condensed consolidated balance sheets.
	(ii)	Included in accrued liabilities on the condensed consolidated balance sheets.
	(iii)	Included in accrued liabilities and other liabilities on the condensed consolidated balance sheets.
Offsetting Assets	The following table sets forth the offsetting of derivative assets as of March 31, 2015 and December 31, 2014 (in thousands):
										Gross Amounts Not Offset
										in the Condensed Consolidated
										Balance Sheets
		Gross			Gross			Net Amounts					Cash		Net
		Amounts of			Amounts Offset			of Assets		Financial			Collateral		Amount
		Recognized			in the Condensed			Presented		Instruments(i)			Pledged
		Assets			Consolidated			in the Condensed
					Balance Sheets			Consolidated
								Balance Sheets
	As of March 31,
	2015:00:00
	Foreign exchange contracts	$	555		$	—		$	555	$	(78	)	$	—	$	477
	As of December 31,
	2014:00:00
	Foreign exchange contracts	$	310		$	—		$	310	$	(62	)	$	—	$	248
	____________________
	(i)	The balances at March 31, 2015 and December 31, 2014 were related to derivative liabilities which are allowed to be net settled against derivative assets in accordance with the master netting agreements.
Offsetting Liabilities	The following table sets forth the offsetting of derivative liabilities as of March 31, 2015 and December 31, 2014 (in thousands):
										Gross Amounts Not Offset
										in the Condensed Consolidated
										Balance Sheets
		Gross			Gross			Net Amounts		Financial			Cash		Net
		Amounts of			Amounts Offset			of Liabilities		Instruments(ii)			Collateral		Amount
		Recognized			in the Condensed			Presented					Pledged
		Liabilities			Consolidated			in the Condensed
					Balance Sheets			Consolidated
								Balance Sheets
	As of March 31,
	2015:00:00
	Foreign exchange contracts	$	204		$	—		$	204	$	(78	)	$	—	$	126
	As of December 31,
	2014:00:00
	Foreign exchange contracts	$	915		$	—		$	915	$	(62	)	$	—	$	853
	____________________
	(ii)	The balances at March 31, 2015 and December 31, 2014 were related to derivative assets which are allowed to be net settled against derivative liabilities in accordance with the master netting agreements.
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance	The before-tax effects of derivative instruments designated as cash flow hedges on the accumulated other comprehensive income (loss) and condensed consolidated statements of income for the three months ended March 31, 2015 and 2014 are as follows (in thousands):
		Three Months Ended
		March 31,
		2015			2014
	Amount of gain recognized in other comprehensive income (effective portion)	$	1,247		$	1,448
	Amount of gain (loss) reclassified from accumulated other comprehensive income to cost of service revenues and operating expenses (effective portion)	$	358		$	(486	)
	Amount of gain on derivatives due to hedge ineffectiveness recognized in cost of service revenues and operating expenses	$	116		$	—
	No amounts were excluded from the assessment of hedge effectiveness during the three months ended March 31, 2015 and 2014.
	The before-tax loss recognized in other expense, net for non-designated foreign currency forward contracts for the three months ended March 31, 2015 and 2014 are as follows (in thousands):
		Three Months Ended
		March 31,
		2015			2014
	Gain (loss) recognized in other expense, net	$	(77	)	$	75

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The fair value of the Company’s stock-based awards was estimated based on the following assumptions:
		Three Months Ended
		March 31,
		2015			2014
	Option grants:
	Expected volatility	31	%		37 - 40%
	Expected dividends	—			—
	Expected term of options (in years)	3.5			3.5
	Risk-free interest rate	1.1	%		1	%
	ESPP: (i)
	Expected volatility	29	%		36	%
	Expected dividends	—			—
	Expected term of ESPP (in years)	0.5			0.5
	Risk-free interest rate	0.1	%		0.1	%
	PRSUs with market conditions:
	Expected volatility	30% - 39%			—
	Expected dividends	—			—
	Risk-free interest rate	1	%		—
	____________________
	(i)	ESPP purchases are scheduled for the last day of January and July of each year.
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs	The allocations of the stock-based compensation, net of estimated income tax benefit, for the three months ended March 31, 2015 and 2014 are as follows (in thousands):
		Three Months Ended
		March 31,
		2015				2014
	Cost of service revenues	$	1,539			$	1,464
	Research and development	5,060				4,662
	Sales and marketing	4,769				4,706
	General and administrative	3,722				3,414
	Total stock-based compensation	15,090				14,246
	Estimated tax benefit of stock-based compensation	(4,040		)		(3,862		)
	Total stock-based compensation, net of estimated tax benefit	$	11,050			$	10,384
Schedule of Share-based Compensation, Stock Options, Activity	A summary of stock option activity through March 31, 2015 is presented below (in thousands, except per share amounts):
					Weighted-				Weighted	Aggregate
					Average				Average	Intrinsic
		Number of			Exercise Price				Remaining	Value
		Shares			Per Share				Contractual
									Term (Years)
	Outstanding at December 31, 2014	7,186			$	35.82			4.25	$	31,514
	Granted	464			$	42.5
	Exercised	(601	)		$	22.96
	Forfeited or expired	(208	)		$	36.17
	Outstanding at March 31, 2015	6,841			$	37.4			4.24	$	48,057
	Exercisable at March 31, 2015	3,950			$	36.99			3.41	$	30,817
Schedule of Share-based Compensation, Restricted Stock Units Award Activity	A summary of RSU activity, excluding PRSUs, through March 31, 2015 is presented below (in thousands, except per share amounts):
					Weighted-
					Average
		Number of			Grant Date
		Shares			Fair Value
	Outstanding at December 31, 2014	2,513			—
	Awarded	835			$	42.5
	Released	(167	)		$	40.3
	Forfeited	(129	)		$	37.6
	Outstanding at March 31, 2015	3,052			—
Schedule of Nonvested Performance-based Units Activity	A summary of PRSU activity based upon PRSUs granted in 2013 and 2014, certified and actually achieved through the three months ended March 31, 2015 is presented below (in thousands):
		Number of
		Shares
	Outstanding at December 31, 2014	306
	Achieved	138
	Released	(136	)
	Forfeited	(20	)
	Outstanding at March 31, 2015	288
	The fair value of PRSUs released during the three months ended March 31, 2015 was approximately $5.1 million.
	A summary of PRSU activity through the three months ended March 31, 2015 for awards that have not been certified by the Compensation Committee of the Board of Directors as achieved is presented below (in thousands):
		Number of
		Shares
	Outstanding at December 31, 2014	—
	Granted	237
	Forfeited	(2	)
	Outstanding at March 31, 2015	235

Net_Income_per_Common_Share_Ta

Net Income per Common Share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Schedule of Calculation of Numerator and Denominator in Earnings Per Share	The following table sets forth the calculation of basic and diluted net income per share for the three months ended March 31, 2015 and 2014 (in thousands, except per share amounts):
		Three Months Ended
		March 31,
		2015		2014
	Net income	$	21,557	$	24,853
	Weighted-average shares of common stock used to compute basic net income per share (excluding unvested restricted stock)	105,928		109,164
	Effect of dilutive common stock equivalents:
	Dilutive effect of unvested restricted stock units	928		654
	Dilutive effect of employee stock options	568		2,117
	Shares used in computing diluted net income per common share	107,424		111,935
	Basic net income per common share	$	0.2	$	0.23
	Diluted net income per common share	$	0.2	$	0.22
	Weighted average stock options and restricted stock units excluded from calculation due to anti-dilutive effect	3,898		4,653

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	Future minimum lease payments as of March 31, 2015 under non-cancelable operating leases with original terms in excess of one year are summarized as follows (in thousands):
		Operating
		Leases
	Remaining 2015	$	8,634
	2016	9,504
	2017	8,102
	2018	7,511
	2019	6,003
	Thereafter	8,034
	Total future minimum operating lease payments	$	47,788

Significant_Customer_Informati1

Significant Customer Information and Segment Information (Tables)	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas	Total revenue by geographic region is summarized as follows (in thousands):
		Three Months Ended
		March 31,
		2015		2014
	Revenues:
	North America	$	163,874	$	153,844
	Europe, the Middle East, and Africa	56,705		60,202
	Other	29,957		29,051
	Total revenues	$	250,536	$	243,097
	Property and equipment, net by geographic region are summarized as follows (in thousands):
		March 31,		December 31,
		2015		2014
	Property and equipment, net:
	North America	$	141,803	$	143,482
	Europe, the Middle East, and Africa	9,058		10,902
	Other	4,838		5,324
	Total property and equipment, net	$	155,699	$	159,708

Acquisitions_Tables

Acquisitions (Tables) (StrikeIron [Member])	3 Months Ended
	Mar. 31, 2015
StrikeIron [Member]
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following table summarizes the fair value of assets acquired and liabilities assumed of $50.5 million and the acquiree's transaction related costs and debt settlement of $4.1 million, which were paid by the Company (in thousands):
	Assumed liabilities, net of assets	$	(3,499	)
	Identifiable intangible assets:
	Developed and core technology	13,900
	Customer relationships	3,500
	Covenants not to compete	450
	Trade names	40
	Total identifiable net assets	14,391
	Goodwill	36,116
	Total assets acquired and liabilities assumed	50,507
	Acquiree's transaction related costs and debt settlement	4,138
	Total	$	54,645

Summary_of_Significant_Account3

Summary of Significant Accounting Policies (Prior Period Reclassification Adjustment) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014
Sales of Investments [Member]
Summary of Significant Accounting Policies [Line Items]
Prior Period Reclassification Adjustment	($14)
Maturities of Investments [Member]
Summary of Significant Accounting Policies [Line Items]
Prior Period Reclassification Adjustment	$14

Summary_of_Significant_Account4

Summary of Significant Accounting Policies (Financial Assets and Liabilities at Fair Value) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	$257,236,000			$368,531,000
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	0		0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	0		0
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount	0		0
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net [Abstract]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3	0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Cash Equivalents and Short-term Investments	23,142,000			41,739,000
Derivative Asset, Fair Value, Gross Asset	0	[1]		0	[1]
Assets, Fair Value Disclosure, Recurring	23,142,000			41,739,000
Derivative Liability, Fair Value, Gross Liability	0	[2]		0	[3]
Liabilities, Fair Value Disclosure, Recurring	0			0
Stable Net Asset Value Per Share of Money Market Fund and Time Deposits	$1			$1
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Cash Equivalents and Short-term Investments	223,705,000			326,735,000
Derivative Asset, Fair Value, Gross Asset	555,000	[1]		310,000	[1]
Assets, Fair Value Disclosure, Recurring	224,260,000			327,045,000
Derivative Liability, Fair Value, Gross Liability	204,000	[2]		915,000	[3]
Liabilities, Fair Value Disclosure, Recurring	204,000			915,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Cash Equivalents and Short-term Investments	0			0
Derivative Asset, Fair Value, Gross Asset	0	[1]		0	[1]
Assets, Fair Value Disclosure, Recurring	0			0
Derivative Liability, Fair Value, Gross Liability	0	[2]		0	[3]
Liabilities, Fair Value Disclosure, Recurring	0			0
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Cash Equivalents and Short-term Investments	246,847,000			368,474,000
Derivative Asset, Fair Value, Gross Asset	555,000	[1]		310,000	[1]
Assets, Fair Value Disclosure, Recurring	247,402,000			368,784,000
Derivative Liability, Fair Value, Gross Liability	204,000	[2]		915,000	[3]
Liabilities, Fair Value Disclosure, Recurring	204,000			915,000
Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Short-term Investments, Fair Value Disclosure	21,773,000			26,395,000
Time Deposits [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Short-term Investments, Fair Value Disclosure	21,773,000	[4]		26,395,000	[4]
Time Deposits [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Short-term Investments, Fair Value Disclosure	0	[4]		0	[4]
Time Deposits [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Short-term Investments, Fair Value Disclosure	0	[4]		0	[4]
Time Deposits [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Short-term Investments, Fair Value Disclosure	21,773,000	[4]		26,395,000	[4]
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Debt Securities, Fair Value Disclosure	0	[4]		0	[4]
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Debt Securities, Fair Value Disclosure	223,705,000	[4]		326,735,000	[4]
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Debt Securities, Fair Value Disclosure	0	[4]		0	[4]
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Debt Securities, Fair Value Disclosure	223,705,000	[4]		326,735,000	[4]
Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	1,369,000			15,344,000
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	1,369,000	[5]		15,344,000	[5]
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0	[5]		0	[5]
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0	[5]		0	[5]
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	$1,369,000	[5]		$15,344,000	[5]
[1]	Included in prepaid expenses and other current assets on the condensed consolidated balance sheets.
[2]	Included in accrued liabilities on the consolidated balance sheets.
[3]	Included in accrued liabilities and other liabilities on the consolidated balance sheets.
[4]	Included in either cash and cash equivalents or short-term investments on the condensed consolidated balance sheets.
[5]	Included in cash and cash equivalents on the condensed consolidated balance sheets.

Summary_of_Significant_Account5

Summary of Significant Accounting Policies (Foreign Currency Derivatives and Hedging Instruments) (Details) (Foreign Exchange Forward [Member])	3 Months Ended
	Mar. 31, 2015
Foreign Exchange Forward [Member]
Derivative [Line Items]
Maximum Remaining Maturity of Foreign Currency Derivatives	12 months

Cash_Cash_Equivalents_and_Shor2

Cash, Cash Equivalents, and Short-Term Investments (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents, at cost	$257,236	$368,531	$308,448	$297,818
Cash, Available-for-sale Securities and Other Short-term Investments, Cost Basis	498,521	721,869
Available-for-sale Securities, Gross Unrealized Gain	290	225
Available-for-sale Securities, Gross Unrealized Losses	-97	-433
Cash and Cash Equivalents, Fair Value Disclosure	257,236	368,531
Total Short-term Investments, Fair Value Disclosure	241,478	353,130
Total Cash, Cash Equivalents, and Short-term Investments, Estimated Fair Value	498,714	721,661
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	50,962
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-94
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,026
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Accumulated in Investments	-3
Total	241,285	353,338
Corporate Notes and Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	114,165	196,401
Available-for-sale Securities, Gross Unrealized Gain	157	84
Available-for-sale Securities, Gross Unrealized Losses	-86	-371
Available-for-sale Securities, Estimated Fair Value	114,236	196,114
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	32,411
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-83
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,026
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Accumulated in Investments	-3
US Government Agencies Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	29,072	51,987
Available-for-sale Securities, Gross Unrealized Gain	35	13
Available-for-sale Securities, Gross Unrealized Losses	-6	-44
Available-for-sale Securities, Estimated Fair Value	29,101	51,956
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	12,009
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-6
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,920	1,920
Available-for-sale Securities, Gross Unrealized Gain	0	0
Available-for-sale Securities, Gross Unrealized Losses	0	0
Available-for-sale Securities, Estimated Fair Value	1,920	1,920
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	8,992	1,996
Available-for-sale Securities, Gross Unrealized Gain	0	0
Available-for-sale Securities, Gross Unrealized Losses	0	0
Available-for-sale Securities, Estimated Fair Value	8,992	1,996
Time Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Other Short-term Investments, Cost Basis	21,773	26,395
Available-for-sale Securities, Gross Unrealized Gain	0	0
Available-for-sale Securities, Gross Unrealized Losses	0	0
Other Short-term Investments, Estimated Fair Value	21,773	26,395
Municipal Notes and Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	65,363	74,639
Available-for-sale Securities, Gross Unrealized Gain	98	128
Available-for-sale Securities, Gross Unrealized Losses	-5	-18
Available-for-sale Securities, Estimated Fair Value	65,456	74,749
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	6,542
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	-5
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents, at cost	4,000
Cash and Cash Equivalents, Fair Value Disclosure	4,000
Cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents, at cost	251,867	353,187
Cash and Cash Equivalents, Fair Value Disclosure	251,867	353,187
Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents, at cost	1,369	15,344
Cash and Cash Equivalents, Fair Value Disclosure	1,369	15,344
Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents, at cost	5,369	15,344
Cash and Cash Equivalents, Fair Value Disclosure	$5,369	$15,344

Cash_Cash_Equivalents_and_Shor3

Cash, Cash Equivalents, and Short-Term Investments (Short-term Investment Maturities) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Cost
Due within one year	$152,265
Due in one year to two years	66,507
Due after two years	22,513
Total	241,285	353,338
Fair Value
Due within one year	152,363
Due in one year to two years	66,541
Due after two years	22,574
Total	$241,478	$353,130

Intangible_Assets_and_Goodwill2

Intangible Assets and Goodwill (Intangible Assets) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014	Dec. 31, 2014
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross	$210,197			$210,252
Finite-Lived Intangible Assets, Accumulated Amortization	-170,932			-167,091
Finite-Lived Intangible Assets, Net	39,265			43,161
Amortization of intangible assets and acquired technology	3,841		5,521
Developed Technology Rights [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross	145,875			145,929
Finite-Lived Intangible Assets, Accumulated Amortization	-114,919			-112,169
Finite-Lived Intangible Assets, Net	30,956			33,760
Finite-Lived Intangible Asset, Useful Life	6 years
Other Finite Lived Intangible Assets [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross	64,322			64,323
Finite-Lived Intangible Assets, Accumulated Amortization	-56,013			-54,922
Finite-Lived Intangible Assets, Net	8,309	[1]		9,401
Customer Relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross	45,177			45,178
Finite-Lived Intangible Assets, Accumulated Amortization	-40,659			-39,766
Finite-Lived Intangible Assets, Net	4,518			5,412
Finite-Lived Intangible Asset, Useful Life	5 years
Other Intangible Assets (Excluding Developed Technology Rights and Customer Relationships) [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross	19,145	[2]		19,145	[2]
Finite-Lived Intangible Assets, Accumulated Amortization	-15,354	[2]		-15,156	[2]
Finite-Lived Intangible Assets, Net	$3,791	[2]		$3,989	[2]
Other Intangible Assets (Excluding Developed Technology Rights and Customer Relationships) [Member] | Minimum [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Asset, Useful Life	4 years
Other Intangible Assets (Excluding Developed Technology Rights and Customer Relationships) [Member] | Maximum [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Asset, Useful Life	9 years
[1]	Other Intangible Assets includes customer relationships, vendor relationships, trade names, covenants not to compete, and patents.
[2]	All other includes vendor relationships, trade names, covenants not to compete, and patents.

Intangible_Assets_and_Goodwill3

Intangible Assets and Goodwill (Amortization Expense) (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Remaining 2015	$10,825
2016	11,332
2017	8,022
2018	5,485
2019	2,780
Thereafter	821
Finite-Lived Intangible Assets, Net	39,265		43,161
Other Finite Lived Intangible Assets [Member]
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Remaining 2015	3,210	[1]
2016	2,449	[1]
2017	1,152	[1]
2018	729	[1]
2019	449	[1]
Thereafter	320	[1]
Finite-Lived Intangible Assets, Net	8,309	[1]	9,401
Developed Technology Rights [Member]
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Remaining 2015	7,615
2016	8,883
2017	6,870
2018	4,756
2019	2,331
Thereafter	501
Finite-Lived Intangible Assets, Net	$30,956		$33,760
[1]	Other Intangible Assets includes customer relationships, vendor relationships, trade names, covenants not to compete, and patents.

Intangible_Assets_and_Goodwill4

Intangible Assets and Goodwill (Goodwill) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
Goodwill [Roll Forward]
Beginning balance as of December 31, 2014	$551,196,000
Goodwill from acquisition	0
Subsequent goodwill adjustments	-8,471,000
Ending balance as of March 31, 2015	$542,725,000

Borrowings_Credit_Agreement_De

Borrowings (Credit Agreement) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Sep. 26, 2014
Line of Credit Facility [Line Items]
Total Unsecured Revolving Credit Facility		$220,000,000
Option to request additional commitments on credit facility		30,000,000
Line of Credit Facility, Maximum Borrowing Capacity		250,000,000
Amounts Outstanding under the Credit Agreement	0
Line of Credit Facility, Remaining Borrowing Capacity	220,000,000
Maximum Consolidated Leverage Ratio	2.75
Minimum Consolidated Interest Coverage Ratio	3.5
Debt Instrument, Additional Interest Margin for Overdue Principal, Stated Percentage	2.00%
Minimum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Unborrowed Amount, Commitment Fee Percentage	0.23%
Maximum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Unborrowed Amount, Commitment Fee Percentage	0.35%
Base Rate [Member]
Line of Credit Facility [Line Items]
Line of Credit, Frequency of Interest Payment	3 months
Debt Instrument, Additional Interest Margin for Other Overdue Amounts, Stated Percentage	2.00%
Base Rate [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Base Rate [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
London Interbank Offered Rate (LIBOR) [Member] | Period One [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maturity Period, Variable Rate	1 month
London Interbank Offered Rate (LIBOR) [Member] | Period Two [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maturity Period, Variable Rate	2 months
London Interbank Offered Rate (LIBOR) [Member] | Period Three [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maturity Period, Variable Rate	3 months
London Interbank Offered Rate (LIBOR) [Member] | Period Four [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maturity Period, Variable Rate	6 months
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.00%
Line of Credit, Frequency of Interest Payment	3 months
Federal Funds Effective Swap Rate [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Swingline Loan [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		10,000,000
Standby Letters of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$20,000,000

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Income (Loss), Net of Tax) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss) at beginning of period	($31,789,000)		($3,212,000)
Other comprehensive income (loss):
Other comprehensive income (loss), before reclassifications, net of tax	-15,981,000		1,560,000
Reclassification for net (gain) loss from accumulated other comprehensive income (loss), current period, net of tax	-224,000		299,000
Other comprehensive income (loss), net of tax effect	-16,205,000		1,859,000
Accumulated other comprehensive income (loss), at end of period	-47,994,000		-1,353,000
Other Comprehensive Income (Loss), Tax [Abstract]
Tax benefit (expense) related to foreign currency translation adjustment	1,560,000		-161,000
Cumulative translation reclassification adjustment, no tax effect	0		0
Tax benefit (expense) related to available-for-sale investments, before reclassification adjustments	-155,000		-57,000
Tax benefit (expense) of reclassification adjustment for sale of securities included in net income	-2,000		-1,000
Tax benefit (expense) related to unrealized gain (loss) on cash flow hedges arising during the period	-476,000		-550,000
Tax benefit (expense) of reclassification adjustment on cash flow hedges included in net income	-137,000		185,000
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss) at beginning of period	-31,312,000		-2,879,000
Other comprehensive income (loss):
Other comprehensive income (loss), before reclassifications, net of tax	-17,003,000		569,000
Reclassification for net (gain) loss from accumulated other comprehensive income (loss), current period, net of tax	0		0
Other comprehensive income (loss), net of tax effect	-17,003,000		569,000
Accumulated other comprehensive income (loss), at end of period	-48,315,000		-2,310,000
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss) at beginning of period	-129,000		63,000
Other comprehensive income (loss):
Other comprehensive income (loss), before reclassifications, net of tax	251,000		93,000
Reclassification for net (gain) loss from accumulated other comprehensive income (loss), current period, net of tax	-3,000	[1]	-2,000	[2]
Other comprehensive income (loss), net of tax effect	248,000	[3]	91,000	[4]
Accumulated other comprehensive income (loss), at end of period	119,000		154,000
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss) at beginning of period	-348,000		-396,000
Other comprehensive income (loss):
Other comprehensive income (loss), before reclassifications, net of tax	771,000		898,000
Reclassification for net (gain) loss from accumulated other comprehensive income (loss), current period, net of tax	-221,000	[5]	301,000	[6]
Other comprehensive income (loss), net of tax effect	550,000	[3]	1,199,000	[4]
Accumulated other comprehensive income (loss), at end of period	$202,000		$803,000
[1]	The before-tax gain of $5 was included in other expense, net on the condensed consolidated statements of income.
[2]	The before-tax loss of $3 was included in other expense, net on the condensed consolidated statements of income.
[3]	The tax expense related to the net gain reclassified from accumulated other comprehensive income (loss) was included in income tax provision on the condensed consolidated statements of income.
[4]	The tax benefit related to the net loss reclassified from accumulated other comprehensive income (loss) was included in income tax provision on the condensed consolidated statements of income.
[5]	The before-tax gain of $87 and $271 were included in cost of service revenues and operating expenses, primarily research and development expense, respectively on the condensed consolidated statements of income.
[6]	The before-tax losses of $120 and $366 were included in cost of service revenues and operating expenses, primarily research and development expense, respectively on the condensed consolidated statements of income.

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Income (Loss) (Reclassification out of Accumulated Other Comprehensive Income) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other (income) expense, net	($368)		$84
Cost of service revenues	40,551		40,229
Operating expenses	171,627		158,947
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other (income) expense, net	-5	[1]	3	[2]
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of service revenues	87	[3]	-120	[4]
Operating expenses	$271	[3]	($366)	[4]
[1]	The before-tax gain of $5 was included in other expense, net on the condensed consolidated statements of income.
[2]	The before-tax loss of $3 was included in other expense, net on the condensed consolidated statements of income.
[3]	The before-tax gain of $87 and $271 were included in cost of service revenues and operating expenses, primarily research and development expense, respectively on the condensed consolidated statements of income.
[4]	The before-tax losses of $120 and $366 were included in cost of service revenues and operating expenses, primarily research and development expense, respectively on the condensed consolidated statements of income.

Derivative_Financial_Instrumen2

Derivative Financial Instruments (Fair Value) (Details) (Foreign Exchange Forward [Member], USD $)	3 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Maximum Remaining Maturity of Foreign Currency Derivatives	12 months
Derivative Asset, Fair Value, Gross Asset	$555,000	[1]	$310,000	[1]
Derivative Liability, Fair Value, Gross Liability	204,000	[2]	915,000	[3]
Cash Flow Hedging [Member] | Long [Member]
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	41,000,000		45,900,000
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	385,000	[1]	141,000	[1]
Derivative Liability, Fair Value, Gross Liability	14,000	[2]	761,000	[3]
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	170,000	[1]	169,000	[1]
Derivative Liability, Fair Value, Gross Liability	190,000	[2]	154,000	[3]
Not Designated as Hedging Instrument [Member] | Long [Member]
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	10,400,000		10,600,000
Not Designated as Hedging Instrument [Member] | Short [Member]
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	$6,200,000		$57,100,000
[1]	Included in prepaid expenses and other current assets on the condensed consolidated balance sheets.
[2]	Included in accrued liabilities on the condensed consolidated balance sheets.
[3]	Included in accrued liabilities and other liabilities on the condensed consolidated balance sheets.

Derivative_Financial_Instrumen3

Derivative Financial Instruments (Offsetting of Derivative Assets) (Details) (Foreign Exchange Forward [Member], USD $)	Mar. 31, 2015		Dec. 31, 2014
In Thousands, unless otherwise specified
Foreign Exchange Forward [Member]
Offsetting Assets [Line Items]
Derivative Asset, Fair Value, Gross Asset	$555	[1]	$310	[1]
Derivative Asset, Fair Value, Gross Liability	0		0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	555		310
Derivative, Collateral, Obligation to Return Securities	-78	[2]	-62	[2]
Derivative, Collateral, Obligation to Return Cash	0		0
Derivative Asset, Fair Value, Amount Offset Against Collateral	$477		$248
[1]	Included in prepaid expenses and other current assets on the condensed consolidated balance sheets.
[2]	The balances at March 31, 2015 and December 31, 2014 were related to derivative liabilities which are allowed to be net settled against derivative assets in accordance with the master netting agreements.

Derivative_Financial_Instrumen4

Derivative Financial Instruments (Offsetting of Derivative Liabilities) (Details) (Foreign Exchange Forward [Member], USD $)	Mar. 31, 2015		Dec. 31, 2014
In Thousands, unless otherwise specified
Foreign Exchange Forward [Member]
Offsetting Liabilities [Line Items]
Derivative Liability, Fair Value, Gross Liability	$204	[1]	$915	[2]
Derivative Liability, Fair Value, Gross Asset	0		0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	204		915
Derivative, Collateral, Right to Reclaim Securities	-78	[3]	-62	[3]
Derivative, Collateral, Right to Reclaim Cash	0		0
Derivative Liability, Fair Value, Amount Offset Against Collateral	$126		$853
[1]	Included in accrued liabilities on the condensed consolidated balance sheets.
[2]	Included in accrued liabilities and other liabilities on the condensed consolidated balance sheets.
[3]	The balances at March 31, 2015 and December 31, 2014 were related to derivative assets which are allowed to be net settled against derivative liabilities in accordance with the master netting agreements.

Derivative_Financial_Instrumen5

Derivative Financial Instruments (Effects on the Accumulated Other Comprehensive Income and Condensed Consolidated Statements of Income) (Details) (Foreign Exchange Forward [Member], USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Amount of gain recognized in other comprehensive income (effective portion)	$1,247	$1,448
Amount of gain (loss) reclassified from accumulated other comprehensive income to cost of service revenues and operating expenses (effective portion)	358	-486
Amount of gain on derivatives due to hedge ineffectiveness recognized in cost of service revenues and operating expenses	116	0
Not Designated as Hedging Instrument [Member]
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Gain (loss) recognized in other expense, net	($77)	$75

Stock_Repurchase_Program_Detai

Stock Repurchase Program (Details) (USD $)	0 Months Ended
Share data in Millions, unless otherwise specified	Feb. 04, 2015	Mar. 31, 2015	Feb. 28, 2015	Feb. 04, 2015	Jan. 31, 2015	Dec. 31, 2014	Oct. 31, 2014	Jul. 31, 2014	Jan. 31, 2014
			counterparty
Stock Repurchase Program [Abstract]
Stock Repurchase Program, Authorized Amount					$337,000,000	$300,000,000	$100,000,000	$100,000,000	$100,000,000
Accelerated Share Repurchases Agreements, Number of Counterparties			2
Accelerated Share Repurchases, Agreement Amount			300,000,000
Accelerated Share Repurchases, Upfront Payment				300,000,000
Stock Repurchased and Retired During Period, Shares	5.7
Stock Repurchase Program, Remaining Amount Authorized to be Repurchased		$200,000,000

StockBased_Compensation_Valuat

Stock-Based Compensation (Valuation Assumptions) (Details)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Option Grants [Member]
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Expected volatility rate	31.00%
Expected volatility rate, minimum			37.00%
Expected volatility rate, maximum			40.00%
Expected dividends	0.00%		0.00%
Expected term	3 years 6 months		3 years 6 months
Risk-free interest rate	1.10%		1.00%
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Expected volatility rate	29.00%	[1]	36.00%	[1]
Expected dividends	0.00%	[1]	0.00%	[1]
Expected term	6 months	[1]	6 months	[1]
Risk-free interest rate	0.10%	[1]	0.10%	[1]
Performance Shares [Member]
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Expected volatility rate			0.00%
Expected volatility rate, minimum	30.00%
Expected volatility rate, maximum	39.00%
Expected dividends	0.00%		0.00%
Risk-free interest rate	1.00%		0.00%
[1]	ESPP purchases are scheduled for the last day of January and July of each year.

StockBased_Compensation_Alloca

Stock-Based Compensation (Allocation of Stock-Based Compensation Expense) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$15,090	$14,246
Estimated tax benefit of stock-based compensation	-4,040	-3,862
Total stock-based compensation, net of estimated tax benefit	11,050	10,384
Cost of service revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	1,539	1,464
Research and development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	5,060	4,662
Sales and marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	4,769	4,706
General and administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$3,722	$3,414

StockBased_Compensation_Stock_

Stock-Based Compensation (Stock Option Activity) (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Number of Shares
Outstanding at December 31, 2014 (shares)	7,186
Granted (shares)	464
Exercised (shares)	-601
Forfeited or expired (shares)	-208
Outstanding at March 31, 2015 (shares)	6,841	7,186
Exercisable at March 31, 2015 (shares)	3,950
Weighted- Average Exercise Price Per Share
Outstanding at December 31, 2014 (usd per share)	$35.82
Granted (usd per share)	$42.50
Exercised (usd per share)	$22.96
Forfeited or expired (usd per share)	$36.17
Outstanding at March 31, 2015 (usd per share)	$37.40	$35.82
Exercisable at March 31, 2015 (usd per share)	$36.99
Additional Disclosures
Weighted average remaining contractual term of outstanding options (in years)	4 years 2 months 27 days	4 years 3 months
Weighted average remaining contractual term of options exercisable at end of period	3 years 4 months 28 days
Aggregate intrinsic value of options outstanding	$48,057	$31,514
Aggregate intrinsic value of options exercisable at end of period	$30,817

StockBased_Compensation_Restri

Stock-Based Compensation (Restricted Stock Unit Activity) (Details) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015
Restricted Stock Units (RSUs) [Member]
Number of Shares
Outstanding at December 31, 2014 (shares)	2,513
Granted (shares)	835
Released (shares)	-167
Forfeited (shares)	-129
Outstanding at March 31, 2015 (shares)	3,052
Weighted- Average Grant Date Fair Value
Outstanding at December 31, 2014 (usd per share)	$0
Awarded (usd per share)	$42.50
Released (usd per share)	$40.30
Forfeited (usd per share)	$37.60
Outstanding at March 31, 2015 (usd per share)	$0
Future Performance Period (3 years) [Member] | Performance Shares [Member]
Weighted- Average Grant Date Fair Value
Outstanding at March 31, 2015 (usd per share)	$46.93
Award vesting period	3 years
Current Performance Period [Member] | Performance Shares [Member]
Weighted- Average Grant Date Fair Value
Outstanding at March 31, 2015 (usd per share)	$43.06
Award vesting period	4 years

StockBased_Compensation_Perfor

Stock-Based Compensation (Performance Restricted Share Activity) (Details) (Performance Shares [Member], USD $)	3 Months Ended
In Millions, except Share data in Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$5.10
Target number of shares awarded	237
Number of Shares
Outstanding at March 31, 2015 (shares)	523
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$21.30
Current and Future Performance Periods [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	237
Number of Shares
Outstanding at December 31, 2014 (shares)	0
Forfeited (shares)	-2
Outstanding at March 31, 2015 (shares)	235
Prior Performance Period [Member]
Number of Shares
Outstanding at December 31, 2014 (shares)	306
Achieved (shares)	138
Released (shares)	-136
Forfeited (shares)	-20
Outstanding at March 31, 2015 (shares)	288
Current Performance Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target number of shares awarded	149
Award vesting period	4 years
Maximum percentage of target number of shares eligible to receive	125.00%
Weighted average grant date fair value per share (usd per share)	$43.06
Future Performance Period (3 years) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target number of shares awarded	88
Award vesting period	3 years
Maximum percentage of target number of shares eligible to receive	188.00%
Weighted average grant date fair value per share (usd per share)	$46.93
Prior Performance Period One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target number of shares awarded		223
Weighted average grant date fair value per share (usd per share)		$38.25
Number of Shares
Achieved (shares)		138
Minimum [Member] | Prior Performance Period One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		2 years
Maximum [Member] | Prior Performance Period One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		4 years
Award Recipients, Group One [Member] | Prior Performance Period One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum percentage of target number of shares eligible to receive		125.00%
Award Recipients, Group Two [Member] | Prior Performance Period One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum percentage of target number of shares eligible to receive		150.00%

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Percent	35.00%	34.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$27.60	$27.10
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	2.1	2.3
Unrecognized Tax Benefits	$35.90
State and Local Jurisdiction, and Foreign Tax Authority [Member] | Minimum [Member]
Income Taxes [Line Items]
Open Tax Years	3 years
State and Local Jurisdiction, and Foreign Tax Authority [Member] | Maximum [Member]
Income Taxes [Line Items]
Open Tax Years	6 years

Net_Income_per_Common_Share_De

Net Income per Common Share (Details) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Net income	$21,557	$24,853
Weighted-average shares of common stock used to compute basic net income per share (excluding unvested restricted stock) (shares)	105,928	109,164
Weighted Average Number Diluted Shares Outstanding Adjustment [Abstract]
Shares used in computing diluted net income per common share (shares)	107,424	111,935
Basic net income per common share (usd per share)	$0.20	$0.23
Diluted net income per common share (usd per share)	$0.20	$0.22
Weighted average stock options and restricted stock units excluded from calculation due to anti-dilutive effect (shares)	3,898	4,653
Restricted Stock Units (RSUs) [Member]
Weighted Average Number Diluted Shares Outstanding Adjustment [Abstract]
Dilutive effect of incremental common shares (shares)	928	654
Option Grants [Member]
Weighted Average Number Diluted Shares Outstanding Adjustment [Abstract]
Dilutive effect of incremental common shares (shares)	568	2,117

Commitments_and_Contingencies_1

Commitments and Contingencies (Lease Commitments) (Details) (USD $)	Mar. 31, 2015
In Thousands, unless otherwise specified
Operating Leases, Future Minimum Payments Receivable [Abstract]
Remaining 2015	$8,634
Due in 2016	9,504
Due in 2017	8,102
Due in 2018	7,511
Due in 2019	6,003
Thereafter	8,034
Total future minimum operating lease payments	$47,788

Commitments_and_Contingencies_2

Commitments and Contingencies (Warranty Accrual) (Details)	3 Months Ended
	Mar. 31, 2015
Minimum [Member]
Product Liability Contingency [Line Items]
Product Warranty Period	3 months
Maximum [Member]
Product Liability Contingency [Line Items]
Product Warranty Period	6 months

Significant_Customer_Informati2

Significant Customer Information and Segment Information (Revenues) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$250,536	$243,097
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	163,874	153,844
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	56,705	60,202
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$29,957	$29,051

Significant_Customer_Informati3

Significant Customer Information and Segment Information (Long-Lived Assets) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$155,699	$159,708
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	141,803	143,482
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	9,058	10,902
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$4,838	$5,324

Significant_Customer_Informati4

Significant Customer Information and Segment Information (Additional Information) (Details)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
	customer	customer	customer
Segment Reporting Information [Line Items]
Number of Customers with More Than Ten Percent of Revenues	0	0
Number of Customers with More Than Ten Percent of Accounts Receivable	0		0
Outside North America [Member] | Sales [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	35.00%	37.00%

Acquisitions_Details

Acquisitions (Details) (USD $)	1 Months Ended
	Nov. 30, 2014	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2014
Business Combination, Consideration Transferred [Abstract]
Goodwill		$542,725,000	$551,196,000
Proact [Member]
Business Combination, Consideration Transferred [Abstract]
Payments to Acquire Businesses, Gross	4,000,000
Goodwill	2,700,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets, other than goodwill	1,300,000
StrikeIron [Member]
Business Combination, Consideration Transferred [Abstract]
Amount of Consideration Placed into Escrow				8,300,000
Goodwill				36,116,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Net tangible assets acquired and (liabilities assumed)				-3,499,000
Total identifiable net assets				14,391,000
Acquiree's transaction related costs and debt settlement				4,138,000
Total Consideration				54,645,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net				50,507,000
StrikeIron [Member] | Developed and Core Technology [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Finite-lived intangibles				13,900,000
StrikeIron [Member] | Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Finite-lived intangibles				3,500,000
StrikeIron [Member] | Noncompete Agreements [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Finite-lived intangibles				450,000
StrikeIron [Member] | Trade Names [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Finite-lived intangibles				$40,000

Subsequent_Events_Details

Subsequent Events (Details) (Subsequent Event [Member], USD $)	0 Months Ended
In Millions, except Per Share data, unless otherwise specified	Apr. 06, 2015	Apr. 16, 2015
		claims
Subsequent Event [Line Items]
Acquisition share price (in dollars per share)	$48.75
Termination fee upon cancellation of merger	$160
Period Subsquent to Merger Agreement Termination	1 year
Termination fee receivable upon cancellation of merger by counter party	$320
Number of class action complaints		2
Employee Stock Option [Member]
Subsequent Event [Line Items]
Acquisition share price (in dollars per share)	$48.75
Performance Shares [Member]
Subsequent Event [Line Items]
Acquisition share price (in dollars per share)	$48.75
Percentage of Target Number of Shares Eligible to Receive at effective time of merger	100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Period	12 months
Restricted Stock Units (RSUs) [Member]
Subsequent Event [Line Items]
Acquisition share price (in dollars per share)	$48.75
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Period	12 months