Informatica 10-K 26 Feb 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Jan. 30, 2015	Jun. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	INFORMATICA CORP
Entity Trading Symbol	INFA
Entity Central Index Key	1080099
Document Type	10-K
Document Period End Date	31-Dec-14
Amendment Flag	FALSE
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
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 Public Float			$3,876,880
Entity Common Stock, Shares Outstanding		109,432

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$368,531	$297,818
Short-term investments	353,130	379,616
Accounts receivable, net of allowances of $3,465 and $4,135, respectively	235,705	204,374
Deferred tax assets	46,867	32,898
Prepaid expenses and other current assets	25,447	34,541
Total current assets	1,029,680	949,247
Property and equipment, net	159,708	157,308
Goodwill	551,196	523,142
Other intangible assets, net	43,161	41,625
Long-term deferred tax assets	32,032	44,865
Other assets	13,809	6,834
Total assets	1,829,586	1,723,021
Current liabilities:
Accounts payable	12,009	9,257
Accrued liabilities	60,404	54,740
Accrued compensation and related expenses	88,336	80,496
Income taxes payable	6,895	14,184
Deferred revenues	324,296	285,184
Total current liabilities	491,940	443,861
Long-term deferred revenues	14,679	12,938
Long-term income taxes payable	30,350	29,878
Other liabilities	3,666	594
Total liabilities	540,635	487,271
Commitments and contingencies (Note 14)
Stockholders' Equity:
Common stock, $0.001 par value; 200,000 shares authorized; 108,704 shares and 108,643 shares issued and outstanding at December 31, 2014 and 2013, respectively	109	109
Additional paid-in capital	773,419	805,728
Accumulated other comprehensive loss	-31,789	-3,212
Retained earnings	547,212	433,125
Total stockholders’ equity	1,288,951	1,235,750
Total liabilities and stockholders' equity	$1,829,586	$1,723,021

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Current assets:
Accounts receivable, allowances	$3,465	$4,135
Stockholders' Equity:
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	108,704,000	108,643,000
Common stock, shares outstanding	108,704,000	108,643,000

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues:
Software	$457,364	$413,738	$350,175
Service	590,590	534,433	461,396
Total revenues	1,047,954	948,171	811,571
Cost of revenues:
Software	13,048	9,838	7,844
Service	171,657	149,136	122,798
Amortization of acquired technology	13,141	22,307	21,980
Total cost of revenues	197,846	181,281	152,622
Gross profit	850,108	766,890	658,949
Operating expenses:
Research and development	193,866	165,875	143,607
Sales and marketing	397,024	374,315	305,682
General and administrative	82,684	77,641	63,616
Amortization of intangible assets	5,943	7,729	6,578
Facilities restructuring and facility lease termination costs	0	0	710
Acquisitions and other charges	1,103	2,467	2,797
Total operating expenses	680,620	628,027	522,990
Income from operations	169,488	138,863	135,959
Interest income	4,646	3,486	3,993
Interest expense	-487	-462	-497
Other expense, net	-3,354	-1,165	-1,688
Income before income taxes	170,293	140,722	137,767
Income tax provision	56,206	54,327	44,585
Net income	$114,087	$86,395	$93,182
Basic net income per common share	$1.04	$0.80	$0.86
Diluted net income per common share	$1.03	$0.78	$0.83
Shares used in computing basic net income per common share	109,199	108,146	107,874
Shares used in computing diluted net income per common share	110,960	111,394	112,089

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$114,087	$86,395	$93,182
Other comprehensive income (loss):
Change in foreign currency translation adjustment, net of tax benefit (expense) of $664, $(172) and $(144)	-28,433	5,133	3,363
Available-for-sale investments:
Change in net unrealized gain (loss), net of tax benefit (expense) of $111, $126 and $(244)	-181	-205	398
Less: reclassification adjustment for net (gain) loss included in net income, net of tax benefit (expense) of $(7), $16 and $(19)	-11	26	-31
Net change, net of tax benefit (expense) of $118, $110 and $(225)	-192	-179	367
Cash flow hedges:
Change in unrealized gain (loss), net of tax benefit (expense) of $(483), $794 and $226	787	-1,295	-368
Net gain from discontinuance of cash flow hedges, net of tax expense of $(3), $- and $-	6	0	0
Reclassification adjustment for net (gain) loss included in net income, net of tax benefit (expense) of $(453), $710 and $865	-739	1,159	1,410
Reclassification for net gain into earnings related to discontinuance of cash flow hedges, net of tax expense of $(3), $- and $-	-6	0	0
Net change, net of tax benefit (expense) of $(30), $84 and $(639)	48	-136	1,042
Total other comprehensive income (loss), net of tax effect	-28,577	4,818	4,772
Total comprehensive income, net of tax effect	$85,510	$91,213	$97,954

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Portion Attributable to Parent [Abstract]
Tax benefit (expense) related to foreign currency translation adjustment	$664	($172)	($144)
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax, Portion Attributable to Parent [Abstract]
Tax benefit (expense) related to available-for-sale investments before reclassification adjustment	111	126	-244
Less: Tax benefit (expense) related to reclassification adjustment for sale of securities included in net income	-7	16	-19
Tax benefit (expense) related to available-for-sale investments	118	110	-225
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Portion Attributable to Parent [Abstract]
Tax benefit (expense) related to unrealized gain (loss) on cash flow hedges arising during the period	-483	794	226
Tax expense related to net gain from discontinuance of cash flow hedges arising during the period	-3	0	0
Less: Tax benefit (expense) related to reclassification adjustment on cash flow hedges included in net income	-453	710	865
Tax expense related to reclassification adjustment on discontinuance of cash flow hedges	-3	0	0
Tax benefit (expense) related to cash flow hedges	($30)	$84	($639)

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (USD $)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings [Member]	Parent [Member]	Noncontrolling Interest [Member]
In Thousands, unless otherwise specified
Total equity, beginning balance at Dec. 31, 2011	$992,203
Stockholders' equity attributable to noncontrolling interest, beginning balance at Dec. 31, 2011							0
Total Informatica Corporation stockholders' equity, beginning balance at Dec. 31, 2011		107	751,350	-12,802	253,548	992,203
Shares, issued at beginning of the year at Dec. 31, 2011		106,946
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock options exercised, shares	1,884	1,884
Common stock options exercised, value	25,243	2	25,241			25,243
Common stock issued under employee stock purchase plans, shares		528
Common stock issued under employee stock purchase plan, value	16,108	0	16,108			16,108
Restricted stock units vested, shares		535
Restricted stock units vested, value	0	0	0			0
Withholding taxes related to restricted stock units net share settlement, shares		-157
Withholding taxes related to restricted stock units net share settlement, value	-6,686	0	-6,686			-6,686
Stock-based compensation, value	42,803		42,803			42,803
Tax benefit of stock-based compensation	16,463		16,463			16,463
Stock repurchased and retired during period, shares	-2,435	-2,435
Stock repurchased and retired during period, value	-80,983	-2	-80,981			-80,983
Noncontrolling interest from acquisition	2,418	0	0			0	2,418
Net income	93,182				93,182	93,182	0
Other comprehensive income (loss), net of tax	4,772			4,772		4,772	0
Total equity, ending balance at Dec. 31, 2012	1,105,523
Stockholders' equity attributable to noncontrolling interest, ending balance at Dec. 31, 2012							2,418
Total Informatica Corporation stockholders' equity, ending balance at Dec. 31, 2012		107	764,298	-8,030	346,730	1,103,105
Shares, issued at end of the year at Dec. 31, 2012		107,301
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock options exercised, shares	2,671	2,671
Common stock options exercised, value	40,711	3	40,708			40,711
Common stock issued under employee stock purchase plans, shares		652
Common stock issued under employee stock purchase plan, value	17,958	1	17,957			17,958
Restricted stock units vested, shares		711
Restricted stock units vested, value	0	0	0			0
Withholding taxes related to restricted stock units net share settlement, shares		-204
Withholding taxes related to restricted stock units net share settlement, value	-7,342	0	-7,342			-7,342
Stock-based compensation, value	56,091		56,091			56,091
Tax benefit of stock-based compensation	26,082		26,082			26,082
Stock repurchased and retired during period, shares	-2,488	-2,488
Stock repurchased and retired during period, value	-92,068	-2	-92,066			-92,068
Noncontrolling interest, redemptions or purchase of Interests	-2,418	0	0			0	-2,418
Net income	86,395				86,395	86,395	0
Other comprehensive income (loss), net of tax	4,818			4,818		4,818	0
Total equity, ending balance at Dec. 31, 2013	1,235,750
Stockholders' equity attributable to noncontrolling interest, ending balance at Dec. 31, 2013							0
Total Informatica Corporation stockholders' equity, ending balance at Dec. 31, 2013	1,235,750	109	805,728	-3,212	433,125	1,235,750
Shares, issued at end of the year at Dec. 31, 2013	108,643	108,643
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock options exercised, shares	2,942	2,942
Common stock options exercised, value	38,915	3	38,912			38,915
Common stock issued under employee stock purchase plans, shares		667
Common stock issued under employee stock purchase plan, value	20,108	1	20,107			20,108
Restricted stock units vested, shares		743
Restricted stock units vested, value	0	0	0			0
Withholding taxes related to restricted stock units net share settlement, shares		-217
Withholding taxes related to restricted stock units net share settlement, value	-7,927	0	-7,927			-7,927
Stock-based compensation, value	59,362		59,362			59,362
Tax benefit of stock-based compensation	-1,520		-1,520			-1,520
Stock repurchased and retired during period, shares	-4,074	-4,074
Stock repurchased and retired during period, value	-141,247	-4	-141,243			-141,247
Net income	114,087				114,087	114,087	0
Other comprehensive income (loss), net of tax	-28,577			-28,577		-28,577	0
Total equity, ending balance at Dec. 31, 2014	1,288,951
Stockholders' equity attributable to noncontrolling interest, ending balance at Dec. 31, 2014							0
Total Informatica Corporation stockholders' equity, ending balance at Dec. 31, 2014	$1,288,951	$109	$773,419	($31,789)	$547,212	$1,288,951
Shares, issued at end of the year at Dec. 31, 2014	108,704	108,704

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities:
Net income	$114,087	$86,395	$93,182
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	19,107	14,978	12,284
Stock-based compensation	59,362	57,204	42,803
Deferred income taxes	-1,398	-24,067	-4,651
Tax benefits from stock-based compensation	373	26,082	16,463
Excess tax benefits from stock-based compensation	-3,831	-27,495	-17,021
Amortization of intangible assets and acquired technology	19,084	30,036	28,558
Loss on investment in equity interest	1,998	0	0
Other operating activities, net	0	-352	-854
Changes in operating assets and liabilities:
Accounts receivable	-30,721	-32,009	8,723
Prepaid expenses and other assets	-233	418	10,593
Accounts payable	988	979	-1,416
Accrued expenses and other liabilities	16,900	12,860	-866
Income taxes payable	-1,292	9,596	1,553
Accrued facilities restructuring charges	0	0	-23,977
Deferred revenues	38,767	46,525	35,127
Net cash provided by operating activities	233,191	201,150	200,501
Investing activities:
Purchases of property and equipment	-21,045	-26,508	-141,610
Purchases of investments	-260,933	-367,834	-266,088
Investment in equity interest, net	-282	-2,001	-257
Maturities of investments	220,991	249,294	199,535
Sales of investments	64,147	83,473	8,864
Business acquisitions, net of cash acquired	-58,614	-7,464	-90,542
Purchase of developed technology and patent license	-300	-400	0
Net cash used in investing activities	-56,036	-71,440	-290,098
Financing activities:
Net proceeds from issuance of common stock	59,023	58,669	41,351
Repurchases and retirement of common stock	-141,247	-92,068	-80,983
Withholding taxes related to restricted stock units net share settlement	-7,927	-7,342	-6,686
Payment of contingent consideration	-3,061	-4,170	-8,050
Payment of issuance costs on credit facility	-934	0	0
Excess tax benefits from stock-based compensation	3,831	27,495	17,021
Purchase of acquiree stock and noncontrolling interest	0	-6,365	-437
Net cash used in financing activities	-90,315	-23,781	-37,784
Effect of foreign exchange rate changes on cash and cash equivalents	-16,127	1,762	673
Net increase (decrease) in cash and cash equivalents	70,713	107,691	-126,708
Cash and cash equivalents at beginning of the year	297,818	190,127	316,835
Cash and cash equivalents at end of the year	368,531	297,818	190,127
Supplemental disclosures:
Income taxes paid, net of refunds	58,522	42,717	31,218
Supplemental disclosures of non-cash investing and financing activities:
Unrealized gain (loss) on investments	($192)	($179)	$367

Organization_and_Business

Organization and Business	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Business	Organization and Business
	Informatica Corporation (“Informatica” or the “Company”) was incorporated in California in February 1993 and reincorporated in Delaware in April 1999. The Company is the leading independent provider of enterprise data integration software and services. The Company's solutions enable a wide variety of complex, enterprise-wide data integration initiatives through technologies including cloud data integration, data quality, big data, master data management, data security, data exchange, and data preparation.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies
	Principles of Consolidation
	The 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.
	Use of Estimates
	The Company's consolidated financial statements are prepared in accordance with generally accepted accounting principles (“GAAP”) in the United States, which require the Company 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 upon information available to it 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 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.
	Reclassifications
	Certain reclassifications have also been made within the consolidated balance sheet as of December 31, 2013 to conform to the current year presentation. The Company reclassified $0.9 million out of accounts payable and into accrued liabilities and $9.2 million out of accrued liabilities into accrued compensation and related expenses. Total current liabilities as of December 31, 2013 did not change as a result of these reclassifications.
	Certain reclassifications have also been made within the 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 $61 million and $110 million were reclassified from sales of investments to maturities of investments for the years ended December 31, 2013 and 2012, respectively.
	Revenue Recognition
	The Company derives its revenues from sales of software licenses, subscription-based licenses for a variety of cloud, and data-as-a-service offerings, maintenance and support services, and professional services, consisting of consulting and education services. The Company recognizes revenue in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 985-605, Software Revenue Recognition, ASC 605-25, Multiple Element Arrangements, ASC 605-35, Revenue Recognition for Construction-Type and Production-Type Contracts, the Securities and Exchange Commission's Staff Accounting Bulletin Topic 13, Revenue Recognition, and other authoritative accounting literature.
	Revenue is recognized when persuasive evidence of an arrangement exists, delivery has occurred, the fee is fixed or determinable, and collection is probable.
	Multiple Element Arrangements
	The Company enters into multiple element arrangements that contain software and software-related elements, such as software licenses, subscription-based licenses, maintenance and support, consulting, and education services. The Company uses the residual method to allocate revenue to the software license and recognize license revenue upon delivery when vendor-specific objective evidence (“VSOE”) of fair value exists for all undelivered elements of the arrangement. If VSOE does not exist for any undelivered software product element of the arrangement, all revenue is deferred until all elements have been delivered, or VSOE is established. If VSOE does not exist for any undelivered services elements of the arrangement, all revenue is recognized ratably over the period that the services are expected to be performed.
	The Company enters into multiple element arrangements that contain both software, such as software licenses, and deliverables not within the scope of ASC 985-605, such as cloud offerings. The Company first allocates the total arrangement consideration based on the relative selling prices of the software group of elements as a whole, and to the elements not within the scope of ASC 985-605. The allocation of arrangement consideration is based on the selling price hierarchy, which includes (i) VSOE if available, (ii) third party evidence (“TPE”) if VSOE is not available, or (iii) estimated selling price (“ESP”) if neither VSOE nor TPE is available. The Company then further allocates consideration within the software group to the respective elements within that group following the guidance in ASC 985-605. Revenue allocated to each element is then recognized when the basic revenue recognition criteria are met for each element as described above.
	The Company establishes VSOE for each element based on the price charged when an element is sold separately. In certain limited instances, the Company is not able to establish VSOE for all deliverables in an arrangement with multiple elements. This may be due to the infrequent selling of each element separately, not pricing products or services within a narrow range, or only having a limited sales history.
	For multiple element arrangements that contain both software and deliverables not within the scope of ASC 985-605, when VSOE cannot be established for deliverables not within the scope of ASC 985-605, the Company attempts to establish a selling price based on TPE. TPE is determined based on competitor prices for similar deliverables when sold separately. When the Company is unable to establish a selling price using VSOE or TPE, the Company uses ESP in the allocation of the arrangement consideration. The Company determines ESP by reviewing historical transactions, including transactions whereby the deliverable was sold on a standalone basis and considering several other external and internal factors including, but not limited to, pricing practices including discounting levels dependent on the size of transactions, whether an order represents an upgrade of a previous order and the type of customer. The determination of ESP is made through consultation with the Company's management, taking into consideration the Company's pricing practices and go-to-market strategy.
	Software
	Under ASC 985-605, revenue is recognized when persuasive evidence of an arrangement exists, delivery has occurred, the fee is fixed or determinable, and collection is probable.
	Persuasive evidence of an arrangement exists.  The Company determines that persuasive evidence of an arrangement exists when it has a written contract, signed by both the customer and the Company, and written purchase authorization.
	Delivery has occurred.  Software is considered delivered when title to the physical software media passes to the customer or, in the case of electronic delivery, when the customer has been provided with the access codes to download and operate the software.
	Fee is fixed or determinable.  The Company considers arrangements with extended payment terms not to be fixed or determinable. The Company also consider factors including financing arrangements, the category of customer (end-user customer, distributor, or reseller), rights of return or refund, and history of enforcing terms and conditions of customer contracts. If the license fee in an arrangement is not fixed or determinable, revenue is recognized as payments become due or upon cash receipt, whichever is earlier. The Company's standard agreements do not contain product return rights.
	Collection is probable.  The Company first assesses the credit-worthiness and collectability at a country level based on the country's overall economic climate and general business risk. Then, for the customers in the countries that are deemed credit-worthy, it assesses credit and collectability based on their payment history and credit profile. When a customer is not deemed credit-worthy, revenue is recognized at the time that payment is received.
	The Company requires evidence of sell-through from resellers and distributors for order acceptance. The Company then recognizes revenue from resellers and distributors upon shipment if all other revenue recognition criteria are met, which in substantially all cases is when cash is collected or when the reseller or distributor is deemed credit-worthy based on their payment history and credit profile to conclude that collectability is probable.
	The Company also enters into Original Equipment Manufacturer (“OEM”) arrangements that provide for license fees based on inclusion of technology and/or products in the OEM's products. These arrangements provide for fixed and irrevocable royalty payments. The Company recognizes royalty payments as revenues based on the royalty report that it receives from the OEMs. In the case of OEMs with fixed royalty payments, revenue is recognized upon execution of the agreement, delivery of the software, and when all other criteria for revenue recognition have been met.
	Multiple contracts with a single counterparty executed within close proximity of each other are evaluated to determine if the contracts should be combined and accounted for as a single arrangement. The Company recognizes revenues net of applicable sales taxes, financing charges absorbed by the Company, and amounts retained by our resellers and distributors, if any.
	Subscription revenues, primarily consisting of revenues from customers and partners under subscription-based licenses for a variety of cloud and data-as-a-service offerings, are recognized ratably over the subscription term.
	Services
	The Company recognizes maintenance revenues, which consist of fees for ongoing support and product updates, if and when available, ratably over the term of the contract, typically one year.
	Consulting revenues are primarily related to configuration, installation, and implementation of our products. These services are generally performed on a time-and-materials basis and, accordingly, revenues are recognized as the services are performed. Occasionally, contracts are on a fixed-fee basis and, accordingly, revenues are recognized on a proportional performance model based on actual services performed. If uncertainty exists about the Company's ability to complete the project, ability to collect the amounts due, or in the case of fixed-fee consulting arrangements, ability to estimate the remaining costs to be incurred to complete the project, revenue is deferred until the uncertainty is resolved. Consulting services, if included as part of the software arrangement, generally do not require significant modification or customization of the software and are not considered essential to the functionality of the software. If, in the Company's judgment, the software arrangement includes significant modification or customization of the software, then software license revenue is recognized as the consulting services revenue is recognized.
	Education service revenues are generated from classes offered at our headquarters, sales and training offices, customer locations, and on-line. Revenues are recognized as the classes are delivered.
	Deferred Revenues
	Deferred revenues include deferred license, subscription, maintenance, consulting, and education revenues. For customers not deemed credit-worthy, the Company's practice is to net unpaid deferred revenue for that customer against the related receivable balance.
	Cash and Cash Equivalents
	The Company considers highly liquid investment securities with maturities of 90 days or less at the date of purchase to be cash equivalents. Cash equivalents include money market funds, time deposits, and marketable debt securities. Cash and cash equivalents outside of marketable debt securities are stated at cost, which approximates fair value.
	Investments
	Investments are comprised of time deposits and marketable debt securities. The Company's marketable debt securities consist primarily of certificates of deposit, commercial paper, corporate notes and bonds, U.S. government and agency notes and bonds, and municipal securities with original maturities beyond 90 days. The Company's marketable debt securities are classified as available-for-sale and are reported at fair value, with unrealized gains and losses, net of tax, reported as a separate component of accumulated other comprehensive income (loss) in stockholders' equity. The Company classifies all available-for-sale marketable debt securities, including those with original maturity dates greater than one year, as short-term investments. Realized gains or losses and permanent declines in value, if any, on available-for-sale securities are reported in other income (expense) as incurred. The Company recognizes realized gains and losses upon sales of investment and reclassifies unrealized gains and losses out of accumulated other comprehensive income (loss) into earnings using the specific identification method.
	In accordance with ASC 320, Investments - Debt and Equity Securities, the Company periodically evaluates the investments for other-than-temporary impairment. The Company considers factors such as the length of time and extent to which the investment has been in a continuous unrealized loss position, the financial condition and near-term prospects of the issuer, and the Company's intent to sell, or whether it is more likely than not the Company will be required to sell the investment before recovery of the investment's amortized cost basis. The Company also considers industry analysts' reports and credit ratings in evaluating for other-than-temporary impairment. If the Company believes that an other-than-temporary decline exists, the Company will write down the investment to its fair value. During 2014, 2013, and 2012, the Company did not consider any of its short-term investments to be other-than-temporarily impaired.
	The Company also has investments in privately-held companies that are accounted for under the cost method and included in other non-current assets. The Company periodically evaluates these investments for other-than-temporary impairment. During 2014, the Company realized a loss of $2.0 million on the investment in a privately-held company. During 2013 and 2012, the Company did not consider these investments to be other-than-temporarily impaired.
	Allowance for Doubtful Accounts
	The Company makes estimates as to the overall collectability of accounts receivable and provides an allowance for accounts receivable considered uncollectible. The Company specifically analyzes its accounts receivable based on historical bad debt experience, customer concentrations, customer credit-worthiness, the age of the receivable, current economic trends, and changes in its customer payment terms when evaluating the adequacy of the allowance for doubtful accounts. The Company records the adjustment in general and administrative expense. At December 31, 2014 and 2013, the Company's allowance for doubtful accounts was $3.5 million and $4.1 million, respectively.
	Property and Equipment
	Property and equipment are stated at cost, net of accumulated depreciation. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets. Building, building improvements, and site improvements are amortized over the estimated useful life of 25 years, 10-15 years and 15 years, respectively. Leasehold improvements are amortized over the shorter of the lease term or the estimated useful life of the asset, which range from one to ten years. Computers and equipment and furniture and fixtures are stated at cost and depreciated using the straight-line method over the estimated useful lives of the assets, generally one to five years.
	Software Development Costs
	The Company accounts for software development costs in accordance with ASC 985-20, Costs of Software to Be Sold, Leased, or Marketed. Software development costs are expensed as incurred until the establishment of technological feasibility, at which time those costs are capitalized until the product is available for general release to customers and amortized over the estimated life of the product. Technological feasibility is established upon completion of a working model. To date, costs incurred subsequent to the establishment of technological feasibility have not been significant, and all software development costs have been charged to research and development expense in the accompanying consolidated statements of income.
	Pursuant to ASC 350-40, Internal - Use Software, the Company capitalizes certain costs relating to software acquired, developed, or modified solely to meet the Company's internal requirements and for which there are no substantive plans to market the software. The Company capitalized $1.2 million of internal use software costs for the year ended December 31, 2014. There was a negligible amount capitalized during the year ended December 31, 2013. These capitalized costs are depreciated on a straight-line basis over the estimated useful life.
	Business Combinations
	The Company records the acquired tangible and intangible assets and liabilities assumed based on their estimated fair values at the acquisition date. Goodwill as of the acquisition date is measured as the excess of consideration transferred and the net of the acquisition fair values of the assets acquired and the liabilities assumed. The valuation process requires management to make significant estimates and assumptions, especially at the acquisition date with respect to intangible assets, support obligations assumed, estimated restructuring liabilities, and pre-acquisition contingencies.
	In connection with the measurement process for acquisitions, the Company estimates the fair value of the support obligations assumed. The estimated fair value of the support obligations is determined utilizing a cost build-up approach by estimating the costs related to fulfilling the obligations plus a normal profit margin. The estimated costs to fulfill the support obligations are based on the historical costs related to fulfilling the obligations. The sum of these costs and operating profit approximates, in theory, the amount that we would be required to pay a third party to assume the support obligations.
	The Company expenses transaction costs and restructuring expenses related to the acquisition as incurred. Additionally, the Company identifies pre-acquisition contingencies and determines their respective fair values as of the end of the purchase price allocation period. Any adjustments to pre-acquisition contingencies are recorded in the Company's operating results in the period in which the adjustment is determined. Furthermore, any adjustments to estimates of acquisition related tax contingencies are recorded to goodwill during the measurement period, and in the Company's operating results after the conclusion of the measurement period. Moreover, the Company identifies in-process research and development costs and classifies them as an indefinite lived intangible asset until the asset is put to use or deemed to be impaired.
	Goodwill and Indefinite-Lived Intangible Assets
	The Company tests goodwill and intangible assets with indefinite useful lives for impairment annually on October 31 of each year and whenever events or changes in circumstances indicate that the carrying value of the asset may not be recoverable in accordance with ASC 350, Intangibles - Goodwill and Other. While the Company is permitted to conduct a qualitative assessment to determine whether it is necessary to perform a two-step quantitative goodwill impairment test, for its annual goodwill impairment test in the fourth quarter of 2014, the Company performed a quantitative test for its reporting unit.
	Consistent with the Company's assessment that it has only one reporting segment, the Company has determined that it has only one reporting unit and tests goodwill for impairment at the entity level. The Company tests its goodwill using the two-step process in accordance with ASC 350. In the first step, the Company compares the carrying amount of the reporting unit to the fair value based on quoted market prices of the Company's common stock. If the fair value of the reporting unit exceeds the carrying value, goodwill is not considered impaired and no further testing is required. If the carrying value of the reporting unit exceeds the fair value, goodwill is potentially impaired and the second step of the impairment test must be performed. In the second step, the Company compares the implied fair value of the goodwill, as defined by ASC 350, to its carrying amount to determine the impairment loss, if any. Recoverability of indefinite-lived intangible assets is measured by comparison of the carrying amount of the asset to the future undiscounted cash flows attributable to that asset.
	The Company performed its annual goodwill and indefinite-lived intangible assets impairment tests as of October 31, 2014, 2013, and 2012 and concluded that there was no impairment.
	Impairment of Long-Lived Assets
	The Company evaluates long-lived assets, which includes amortized intangible assets and tangible assets, for impairment whenever events or changes in circumstances indicate that the carrying value of these assets may not be recoverable. Recoverability of these assets is measured by comparison of the carrying amount of an asset to the future undiscounted cash flows attributable to that asset. The Company measures any amount of impairment based on the difference between the carrying value and the fair value of the impaired asset. The Company did not recognize any impairment charges of long-lived assets in 2014, 2013, or 2012.
	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 December 31, 2014 (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)	$	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	$	—
The following table summarizes financial assets and financial liabilities that the Company measures at fair value on a recurring basis as of December 31, 2013 (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)	$	21,893		$	21,893	$	—	$	—
Time deposits (ii)	21,585			21,585		—		—
Marketable debt securities (ii)	370,384			—		370,384		—
Total money market funds, time deposits, and marketable debt securities	413,862			43,478		370,384		—
Foreign currency derivatives (iii)	284			—		284		—
Total assets	$	414,146		$	43,478	$	370,668	$	—
Liabilities:
Foreign currency derivatives (iv)	$	1,024		$	—	$	1,024	$	—
Acquisition-related contingent consideration (iv)	3,071			—		—		3,071
Total liabilities	$	4,095		$	—	$	1,024	$	3,071
___________________
(i)	Included in cash and cash equivalents on the consolidated balance sheets.
(ii)	Included in either cash and cash equivalents or short-term investments on the consolidated balance sheets.
(iii)	Included in prepaid expenses and other current assets on the consolidated balance sheets.
(iv)	Included in accrued liabilities on the consolidated balance sheets.
(v)	Included in accrued 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 debt securities.
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.
The Company's marketable debt 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 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 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 its 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 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 thirteen 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 years ended December 31, 2014 and 2013.
See Note 9. Accumulated Other Comprehensive Loss, Note 10. Derivative Financial Instruments, and Note 14. Commitments and Contingencies of Notes to Consolidated Financial Statements for a further discussion.
Acquisition-related Contingent Consideration
The Company estimated the fair value of the acquisition-related contingent consideration using a probability-weighted discounted cash flow model. This fair value measure was based on significant inputs not observed in the market and thus represented a Level 3 instrument. Level 3 instruments are valued based on unobservable inputs that are supported by little or no market activity and reflect the Company's own assumptions in measuring fair value. There were no transfers into or out of the Level 3 category during the years ended December 31, 2014 and 2013. The change in fair value of acquisition-related contingent consideration is included in acquisitions and other charges in the consolidated statements of income.
The changes in the acquisition-related contingent consideration liability for the year ended December 31, 2014 consisted of the following (in thousands):
	December 31, 2014
Beginning balance as of December 31, 2013	$	3,071
Change in fair value of contingent consideration	(10		)
Payment of contingent consideration	(3,061		)
Ending balance as of December 31, 2014	$	—
Fair Value of Assets and Liabilities on a Nonrecurring Basis
The Company has direct investments in privately held companies accounted for under the cost method, which are periodically assessed for other-than-temporary impairment. The carrying value of these investments was $2.3 million and $4.1 million at December 31, 2014 and 2013, respectively. If it is determined that an other-than-temporary impairment has occurred, the Company writes down the investment to its fair value. The Company estimates fair value of cost method investments considering available information such as pricing in recent rounds of financing, current cash positions, earnings and cash flow forecasts, recent operational performance, and any other readily available data. During 2014, the Company made an additional investment of $0.3 million in a privately-held company, and realized a $2.0 million loss on investments in equity interest of another company. During 2013 and 2012, the Company did not consider these investments to be other-than-temporarily impaired based on the information available at those periods.
Fair Value of Financial Instruments, Concentrations of Credit Risk, and Credit Evaluations
The fair value of the Company's cash, cash equivalents, short-term investments, accounts receivable, and accounts payable approximates their respective carrying amounts due to their short-term maturity.
Financial instruments, which subject the Company to concentrations of credit risk, consist primarily of cash, cash equivalents, investments in time deposits and marketable debt securities, and trade accounts receivable. The Company maintains its cash and cash equivalents and investments with financial institutions with high credit standing.
The Company performs ongoing credit evaluations of its customers and generally does not require collateral. The Company makes judgments as to its ability to collect outstanding receivables and provide allowances for the portion of receivables when collection becomes doubtful. Provisions are made based upon a specific review of all significant outstanding invoices. For those invoices not specifically reviewed, provisions are provided at differing rates, based upon the age of the receivable. In determining these percentages, the Company analyzes its historical collection experience and current economic trends. If the historical data it uses to calculate the allowance for doubtful accounts does not reflect the future ability to collect outstanding receivables, additional provisions for doubtful accounts may be needed and the future results of operations could be materially affected. The Company evaluates its counterparties associated with the Company's foreign exchange forward contracts at least quarterly as part of its cash flow hedge program. Since all these counterparties are large credit-worthy commercial banking institutions, the Company does not consider counterparty non-performance to be a material risk.
Stock-based Compensation
The Company accounts for stock-based compensation in accordance with the provisions of ASC 718, Stock Compensation. Stock-based awards granted include stock options, restricted stock units (“RSUs”), performance-based restricted stock units (“PRSUs”), and stock purchased under the Company's Employee Stock Purchase Plan. Stock-based compensation expense for stock options, RSUs, and stock purchased under the Employee Stock Purchase Plan is measured at the grant date based on the fair value of the awards and is recognized as an expense ratably on a straight line basis over the requisite service period. See Note 8. Stock-based Compensation for a description of the Company's stock-based compensation plans and more information on the assumptions used to calculate the fair value of stock-based awards.
Stock-based compensation expense is recognized for PRSUs based on the probability of achieving certain performance criteria, as defined in the PRSU agreements. The Company estimates the number of PRSUs ultimately expected to vest and recognizes expense using the graded vesting attribution method over the requisite service period.
Shipping and Handling Costs
Shipping and handling costs in connection with our packaged software products are not material and are expensed as incurred in cost of software revenues in the Company's consolidated statements of income.
Advertising Expense
Advertising costs are expensed as incurred. Advertising expenses were not significant for the years ended December 31, 2014, 2013, and 2012.
Income Taxes
The Company uses the asset and liability method of accounting for income taxes in accordance with ASC 740, Income Taxes. Under this method, income tax expenses or benefits are recognized for the amount of taxes payable or refundable for the current year. In addition, deferred tax assets and liabilities are recognized for the expected future tax consequences of events that have been recognized in the Company's consolidated financial statements or tax returns. The measurement of current and deferred tax assets and liabilities is based on provisions of currently enacted tax laws. The effects of future changes in tax laws or rates are not contemplated.
A two-step approach is applied pursuant to ASC 740 in the recognition and measurement of uncertain tax positions taken or expected to be taken in a tax return. The first step is to determine if the weight of available evidence indicates that it is more likely than not that the tax position will be sustained in an audit, including resolution of any related appeals or litigation processes. The second step is to measure the tax benefit as the largest amount that is more than 50% likely to be realized upon ultimate settlement. We recognize interest and penalties related to uncertain tax positions in our income tax provision line of our consolidated statements of income.
As part of the process of preparing consolidated financial statements, we estimate our income taxes and tax contingencies in each of the tax jurisdictions in which we operate prior to the completion and filing of tax returns for such periods. This process involves estimating actual current tax expense together with assessing temporary differences resulting from differing treatment of items, such as deferred revenue, for tax and accounting purposes. These differences result in net deferred tax assets and liabilities. We must then assess the likelihood that the deferred tax assets will be realizable, and to the extent we believe that a deferred tax asset is not likely to be realized, we must establish a valuation allowance. In assessing the need for any additional valuation allowance, we considered all the evidence available to us, 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.
Foreign Currency Translation
The Company translates the assets and liabilities of its non-U.S. dollar functional currency subsidiaries into U.S. dollars using exchange rates in effect at the end of each period. Revenue and expenses for these subsidiaries are translated using rates that approximate those in effect during the period. Gains and losses from these translations are recognized in cumulative translation adjustments included in accumulated other comprehensive loss in stockholders’ equity.
Reporting Segments
ASC 280, Segment Reporting, establishes standards for the manner in which public companies report information about operating segments in annual and interim financial statements. It also establishes standards for related disclosures about products and services, geographic areas, and major customers. The method for determining the information to report is based on the way management organizes the operating segments within the Company for making operating decisions and assessing financial performance.
The Company's chief operating decision maker is the chief executive officer, who reviews financial information presented on a consolidated basis, accompanied by disaggregated information about revenues by revenue stream and geographic region for purposes of making operating decisions and assessing financial performance. On this basis, the Company is organized and operates in a single segment: the design, development, marketing, and sales of software solutions.
Recent Accounting Pronouncements
In March 2013, the FASB issued Accounting Standards Update (“ASU”) 2013-05, Foreign Currency Matters (Topic 830): Parent's Accounting for the Cumulative Translation Adjustment upon Derecognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity. ASU 2013-05 clarifies that the cumulative translation adjustment (“CTA”) should be released into net income upon the occurrence of certain qualifying events. The Company adopted ASU 2013-05 prospectively as required on January 1, 2014. Adoption of ASU 2013-05 did not impact the Company's consolidated financial statements and disclosures.
In July 2013, the FASB issued ASU 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists, which clarifies that an unrecognized tax benefit should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward if such settlement is required or expected in the event the uncertain tax position is disallowed. In situations where a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available or the tax law of the jurisdiction does not require, and the entity does not intend to use the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. The Company adopted ASU 2013-11 prospectively as required on January 1, 2014. Adoption of ASU 2013-11 did not have a material impact to the Company's 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 its consolidated financial statements and disclosures.

Cash_Cash_Equivalents_and_Shor

Cash, Cash Equivalents, and Short-Term Investments	12 Months Ended
	Dec. 31, 2014
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Cash, Cash Equivalents, and Short-term Investments	Cash, Cash Equivalents, and Short-Term Investments
	Cash consists of deposits with financial institutions. Cash equivalents include money market funds, time deposits, and marketable debt securities. Investments are comprised of time deposits and marketable debt securities. The Company's marketable debt securities consist primarily of certificates of deposit, commercial paper, corporate notes and bonds, U.S. government and agency notes and bonds, and municipal securities with original maturities beyond 90 days. 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. The Company recognizes realized gains and losses upon sales of investment and reclassifies unrealized gains and losses out of accumulated other comprehensive income into earnings using the specific identification method. Realized gains recognized for the years ended December 31, 2014, 2013 and 2012 was negligible.
	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
	The following table summarizes the Company’s cash, cash equivalents, and short-term investments as of December 31, 2013 (in thousands):
				Gross			Gross			Estimated
		Cost		Unrealized			Unrealized			Fair Value
				Gains			Losses
	Cash	$	263,572	$	—		$	—		$	263,572
	Cash equivalents:
	Money market funds	21,893		—			—			21,893
	U.S. government notes and bonds	12,353		—			—			12,353
	Total cash equivalents	34,246		—			—			34,246
	Total cash and cash equivalents	297,818		—			—			297,818
	Short-term investments:
	Certificates of deposit	960		—			—			960
	Commercial paper	12,738		—			—			12,738
	Corporate notes and bonds	175,446		220			(220		)	175,446
	Federal agency notes and bonds	64,863		31			(69		)	64,825
	Time deposits	21,585		—			—			21,585
	Municipal notes and bonds	103,923		153			(14		)	104,062
	Total short-term investments	379,515		404			(303		)	379,616
	Total cash, cash equivalents, and short-term investments	$	677,333	$	404		$	(303	)	$	677,434
	See Note 2. Summary of Significant Accounting Policies of Notes to 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 December 31, 2014 (in thousands):
		Less Than 12 months
				Gross
		Fair Value		Unrealized
				Losses
	Corporate notes and bonds	$	105,704	$	(259	)
	Federal agency notes and bonds	34,434		(44		)
	Municipal notes and bonds	13,120		(18		)
	Total	$	153,258	$	(321	)
	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 December 31, 2014 (in thousands):
		Greater Than 12 months
				Gross
		Fair Value		Unrealized
				Losses
	Corporate notes and bonds	$	7,598	$	(112	)
	Total	$	7,598	$	(112	)
	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 December 31, 2014 (in thousands):
		Cost		Fair Value
	Due within one year	$	190,404	$	190,484
	Due in one year to two years	112,364		112,237
	Due after two years	50,570		50,409
	Total	$	353,338	$	353,130

Property_and_Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and Equipment
	The following table summarizes the cost of property and equipment and related accumulated depreciation at December 31, 2014 and 2013 (in thousands):
		Estimated	December 31,
		Useful Lives	2014			2013
	Land	N/A	$	20,637		$	20,637
	Buildings	25 years	105,725			105,725
	Site improvements	15 years	1,247			1,199
	Building improvements	10-15 years	11,434			11,246
	Total land and buildings		139,043			138,807
	Computer and equipment	1-5 years	67,819			62,423
	Furniture and fixtures	3-5 years	10,206			8,287
	Leasehold improvements	1-10 years	23,802			14,454
	Total property and equipment		240,870			223,971
	Less: Accumulated depreciation and amortization		(81,162		)	(66,663		)
	Total property and equipment, net		$	159,708		$	157,308
	Depreciation and amortization expense was $19.1 million, $15.0 million, and $12.3 million in 2014, 2013, and 2012, respectively.

Intangible_Assets_and_Goodwill

Intangible Assets and Goodwill	12 Months Ended
	Dec. 31, 2014
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 December 31, 2014 and 2013 are as follows (in thousands, except years):
		December 31, 2014								December 31, 2013							Weighted
																	Average
																	Useful Life
		Cost			Accumulated			Net		Cost		Accumulated			Net		(Years)
					Amortization							Amortization
	Developed and core technology	$	145,929		$	(112,169	)	$	33,760	$	130,744	$	(99,026	)	$	31,718	6
	Other intangible assets:
	Customer relationships	45,178			(39,766		)	5,412		41,683		(35,216		)	6,467		5
	All other (i)	19,145			(15,156		)	3,989		17,205		(13,765		)	3,440		9-Apr
	Total other intangible assets	64,323			(54,922		)	9,401		58,888		(48,981		)	9,907
	Total intangible assets, net	$	210,252		$	(167,091	)	$	43,161	$	189,632	$	(148,007	)	$	41,625
	____________________
	(i)	All other includes vendor relationships, trade names, covenants not to compete, and patents.
	Total amortization expense related to intangible assets was $19.1 million, $30.0 million, and $28.6 million for the years ended December 31, 2014, 2013, and 2012, respectively. Of the $19.1 million amortization of intangible assets recorded in 2014, $5.9 million was recorded in operating expenses and $13.1 million was recorded in cost of revenues. Of the $30.0 million amortization of intangible assets recorded in 2013, $7.7 million was recorded in operating expenses and $22.3 million was recorded in cost of revenues. Of the $28.6 million amortization of intangible assets recorded in 2012, $6.6 million was recorded in operating expenses and $22.0 million was recorded in cost of revenues. 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 December 31, 2014, 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			Assets
	2015	$	10,382		$	4,302		$	14,684
	2016	8,899			2,449			11,348
	2017	6,881			1,152			8,033
	2018	4,762			729			5,491
	2019	2,335			449			2,784
	Thereafter	501			320			821
	Total expected amortization expense	$	33,760		$	9,401		$	43,161
	The changes in the carrying amount of goodwill for the years ended December 31, 2014 and 2013 are as follows (in thousands):
		December 31,
		2014			2013
	Beginning balance	$	523,142		$	510,121
	Goodwill from acquisitions	38,776			7,110
	Subsequent goodwill adjustments	(10,722		)	5,911
	Ending balance	$	551,196		$	523,142
	During the year ended December 31, 2014, the Company recorded subsequent goodwill net reductions of $10.7 million primarily related to foreign currency translation adjustments. During the year ended December 31, 2013, the Company recorded subsequent goodwill adjustments of $5.9 million which consist of a $2.8 million measurement period adjustment related to Heiler Software accrued liabilities and foreign currency translation adjustments of $4.0 million, partially offset by income tax related balance sheet adjustments of $0.9 million within the measurement period related to prior acquisitions. The goodwill is partially deductible for tax purposes. See Note 19. Acquisitions for further discussion of goodwill from acquisitions.

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2014
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 replaces the former agreement that matured on September 29, 2014. 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 Agreements as of December 31, 2014 and 2013, 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) 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 December 31, 2014.

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Stockholders' Equity	Stockholders' Equity
	Preferred Stock
	The Company is authorized to issue 2.0 million shares of preferred stock with a par value of $0.001 per share of which 200,000 shares have been designated as Series A preferred stock. The Company may issue preferred stock from time to time in one or more series. The Board of Directors is authorized to provide for the rights, preferences, privileges, and restrictions of the shares of such series. As of December 31, 2014 and 2013, no shares of preferred stock had been issued.
	Common Stock
	The Company has authorized 200 million shares of common stock with a par value of $0.001 per share. Each share of common stock has the right to one vote. The holders of common stock are also entitled to receive dividends whenever funds are legally available and when declared by the Board of Directors, subject to the rights of holders of all classes of stock having priority rights as to dividends. No cash dividends have been declared or paid through December 31, 2014.
	Stock Repurchase Plan
	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 to offset 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. As of December 31, 2014, $162.8 million remained available for repurchase under this program. For further information about additional repurchases after December 31, 2014, see Note 20. Subsequent Event of Notes to Consolidated Financial Statements in Part II, Item 8 of this Report.
	This repurchase program does not have an expiration date. Repurchased shares are retired and reclassified as authorized and unissued shares of common stock. The Company may continue to repurchase shares from time to time, as determined by management under programs approved by the Board of Directors.
	The Company repurchased approximately 4,074,000 shares for $141.2 million, 2,488,000 shares for $92.1 million, and 2,435,000 shares for $81.0 million in 2014, 2013, and 2012, respectively.

StockBased_Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-based Compensation
	Summary of Plans
	1999 Stock Incentive Plan
	The Company's stockholders approved the 1999 Stock Incentive Plan (the “1999 Incentive Plan”) in April 1999 under which 2,600,000 shares were reserved for issuance. In addition, any shares not issued under the 1996 Stock Plan were also available for grant. The number of shares reserved under the 1999 Incentive Plan automatically increased annually beginning on January 1, 2000 by the lesser of 16,000,000 shares or 5% of the total amount of fully diluted shares of common stock outstanding as of such date. Under the 1999 Incentive Plan, eligible employees, officers, and directors may be granted stock options, stock appreciation rights, restricted shares, and stock units. The exercise price for incentive stock options and non-qualified options may not be less than 100% and 85%, respectively, of the fair value of the Company's common stock at the option grant date. Options granted are exercisable over a maximum term of seven to ten years from the date of the grant and generally vest ratably over a period of four years, with options for new employees generally including a 1-year cliff period. This plan expired in March 2009. No further shares will be awarded from this plan. As of December 31, 2014, there were approximately 500,000 options outstanding under the 1999 Incentive Plan.
	2009 Equity Incentive Plan
	The Company's stockholders approved the 2009 Equity Incentive Plan (the “2009 Incentive Plan”) in April 2009 under which 9,000,000 shares have been reserved for issuance. In May 2011, the Company's stockholders approved amendments to the 2009 Equity Incentive Plan to increase the number of shares reserved for issuance by 2,500,000 and to increase the ratio by which full value awards count against the share reserve from 1.52 to 2.37. In May 2012, the Company's stockholders approved an amendment to the 2009 Equity Incentive Plan to increase the number of shares reserved for issuance by 5,000,000. In May 2013, the Company's stockholders approved an amendment to the 2009 Equity Incentive Plan to increase the number of shares reserved for issuance by 4,000,000. In May 2014, the Company's stockholders approved an amendment to the 2009 Equity Incentive Plan to increase the number of shares reserved for issuance by 6,300,000. Under the 2009 Incentive Plan, eligible employees, officers, and directors may be granted stock options (incentive and non-qualified), stock appreciation rights, restricted stock, restricted stock units (“RSUs”), performance shares and performance units. The exercise price for incentive stock options and non-qualified options may not be less than 100% and 85%, respectively, of the fair value of the Company's common stock at the option grant date. Certain employees and non-employee directors may elect to defer the delivery of vested RSUs, and settlement of such RSUs will be in shares of common stock at the end of the elected deferral period.
	As of December 31, 2014, there were approximately 7,121,000 shares available for grant and 10,216,000 options, RSUs and PRSUs outstanding under the 2009 Incentive Plan. For purposes of the share reserve, the grant of a RSU is deemed an award for 1.52 or 2.37 shares of authorized common stock for each one share of authorized common stock subject to such award. The ratio by which an RSU counts against the share reserve is based upon the ratio effective on the date of grant. If a share that was subject to an award and is returned to the 2009 Incentive Plan, the Company would credit the 2009 Incentive Plan reserve by the same ratio as it was originally issued. These returned shares would be available for issuance under the 2009 Incentive Plan. Of the approximately 2,489,000 unvested RSUs, 2,421,000 RSUs were granted at the 2.37 ratio, and approximately 68,000 were granted at the 1.52 ratio. All 517,000 PRSUs outstanding were granted at the 2.37 ratio.
	Stock Options and Restricted Stock Units
	The Company grants stock options which are exercisable over a maximum term of seven to ten years for employees and five to seven years for directors from the date of the grant. These grants generally vest ratably over a period of four years for employees and one to three years for directors. Options granted to new employees generally include a 1-year cliff period.
	The Company also grants RSUs to its employees and directors which vest over four years with annual vesting dates for employees and one to three years for directors. Upon vesting of restricted stock, the recipient has the option to settle minimum withholding taxes by electing to have the Company withhold otherwise deliverable shares having a fair market value equal to the required tax obligations (“net-settlement”). The net-settlement shares are then immediately cancelled and retired. Shares are issued on the vesting dates net of the minimum statutory tax withholding requirements to be paid by the Company on behalf of its employees. As a result, the actual number of shares issued will be fewer than the actual number of RSUs outstanding.
	Employee Stock Purchase Plan
	The Company's stockholders approved the Employee Stock Purchase Plan (“ESPP”) in May 2008 under which 8,850,000 shares have been reserved for issuance. Under the ESPP, eligible employees may elect to contribute from 1% to 20% or a lesser percentage that the Compensation Committee of the Board of Directors (“Compensation Committee”) may establish from time to time of their eligible compensation. Currently, the Compensation Committee established the maximum contribution percentage at 10%. The purchase price is 85% of the lower of the closing price of the Common Stock on the NASDAQ Global Select Market at the beginning or end of the six-month offering period. As of December 31, 2014, the Company had approximately 5,506,000 shares available for future issuance under the ESPP.
	Summary of Assumptions
	The fair value of each option award 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 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 fair value of RSUs and PRSUs is the grant date closing price of our common stock. 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 based on the probability of achieving certain performance criteria, as defined in the PRSU agreements, and uses 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 Company's forfeiture rates for stock options, RSUs and PRSUs were 10% for 2014, 2013, and 2012.
	The fair value of the Company's stock-based awards was estimated based on the following assumptions:
		Years Ended December 31,
		2014				2013				2012
	Option grants:
	Expected volatility	35 - 40		%		41 - 43		%		39 - 48		%
	Weighted-average volatility	39		%		41		%		44		%
	Expected dividends	—				—				—
	Expected term of options (in years)	3.5				3.3				3.3
	Risk-free interest rate	1.1		%		0.7		%		0.5		%
	ESPP:
	Expected volatility	30 - 36		%		37 - 42		%		43 - 53		%
	Weighted-average volatility	32		%		40		%		49		%
	Expected dividends	—				—				—
	Expected term of ESPP (in years)	0.5				0.5				0.5
	Risk-free interest rate	0.1		%		0.1		%		0.1		%
	The allocation of the stock-based compensation, net of estimated income tax benefit, is as follows (in thousands):
		Years Ended December 31,
		2014				2013				2012
	Cost of service revenues	$	5,935			$	5,525			$	4,349
	Research and development	20,255				19,002				14,919
	Sales and marketing	19,062				19,323				13,518
	General and administrative	14,110				13,354				10,017
	Total stock-based compensation	59,362				57,204				42,803
	Estimated tax benefit of stock-based compensation	(16,632		)		(15,934		)		(10,994		)
	Total stock-based compensation, net of estimated tax benefit	$	42,730			$	41,270			$	31,809
	Stock Option Activity
	A summary of stock option activity through December 31, 2014 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, 2011	10,229			$	19.37			3.5		$	218,839
	Granted	2,844			38.81
	Exercised	(1,884	)		13.4
	Forfeited or expired	(495	)		36.72
	Outstanding at December 31, 2012	10,694			$	24.79			3.5		$	104,404
	Granted	2,267			37.34
	Exercised	(2,671	)		15.24
	Forfeited or expired	(866	)		40.67
	Outstanding at December 31, 2013	9,424			$	29.05			3.48		$	127,697
	Granted	1,738			37.05
	Exercised	(2,942	)		13.23
	Forfeited or expired	(1,034	)		40.45
	Outstanding at December 31, 2014	7,186			$	35.82			4.25		$	31,514
	Exercisable at December 31, 2014	4,215			$	34.84			3.41		$	26,168
	The fair value of options vesting during the years ended December 31, 2014, 2013, and 2012 was approximately $17.4 million, $18.5 million, and $15.6 million, respectively. As of December 31, 2014, there were a total of approximately 2,971,000 unvested options with a fair value of $33.4 million and weighted average exercise price of $37.22 and weighted average grant-date fair value of $11.25. The Company expects to recognize the fair value of the unvested shares over a weighted-average period of 2.51 years.
	Restricted Stock Unit Activity
The Company started granting RSUs in 2009. A summary of RSU activity through December 31, 2014 is presented below (in thousands, except per share amounts):
				Weighted-
				Average
	Number of			Grant Date
	Shares			Fair Value
Outstanding at December 31, 2011	1,611
Awarded	1,095			$	40.13
Released	(535	)		$	30.55
Forfeited	-244			$	39.3
Outstanding at December 31, 2012	1,927
Awarded	835			$	35.5
Released	-711			$	33.31
Forfeited	-258			$	39.91
Outstanding at December 31, 2013	1,793
Awarded	1,671			$	35.88
Released	-616			$	38.29
Forfeited	-335			$	37.56
Outstanding at December 31, 2014	2,513
The fair value of RSUs released during the years ended December 31, 2014, 2013 and 2012 was approximately $21.9 million, $25.4 million and $22.5 million, respectively. As of December 31, 2014, there were approximately 24,000 vested deferred RSUs outstanding and not yet released included in the RSU activity above. As of December 31, 2014, there were a total of approximately 2,489,000 unvested RSUs with a fair value of $91.9 million. The Company expects to recognize the fair value of the unvested RSUs over a weighted-average period of 2.68 years.
Performance-Based Restricted Stock Unit Activity
The Company started granting PRSUs in 2012. During the first quarter of 2014, the Company granted approximately 223,000 target PRSUs. The performance period for the target number of PRSUs granted in 2014 is the 2014 year. If certain performance goals are met, PRSUs would become eligible to vest, and 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 have 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 2014 PRSUs was $38.25 per share.
The performance period for the 649,900 target number of PRSUs granted in 2013 was the 2013 year. Certain participants had the ability to receive up to 110% to 125% of the target number of PRSUs originally granted. In the first quarter of 2014, the Compensation Committee certified actual performance achievement for PRSUs granted in 2013, and as a result, 507,000 shares became eligible to vest. The achieved PRSUs vest ratably over four years on the annual anniversary dates of the grant, contingent upon the recipient's continued service to the Company. The weighted-average grant date fair value of 2013 PRSUs was $37.42 per share.
The performance period for the 224,000 target number of PRSUs granted in 2012 was the 2012 year. Certain participants had the ability to receive up to 150% of the target number of PRSUs originally granted. In the first quarter of 2013, the Compensation Committee certified the actual performance achievement of participants for PRSUs granted in 2012. The performance metrics were not achieved, and therefore no PRSUs became eligible to vest. All 224,000 target PRSUs granted were cancelled. The Company did not record any stock-based compensation related to these performance awards.
A summary of PRSU activity granted in 2013, certified and actually achieved through December 31, 2014 is presented below (in thousands):
	Number of
	Shares
Outstanding at December 31, 2013	—
Achieved	507
Released	(127	)
Forfeited	(74	)
Outstanding at December 31, 2014	306
The fair value of PRSUs released during the year ended December 31, 2014 was approximately $4.9 million.
As of December 31, 2014, the PSRUs granted in 2014 had not been certified by the Compensation Committee of the Board of Directors as achieved. A summary of PRSU activity through December 31, 2014 is presented below (in thousands):
	Number of
	Shares
Outstanding at December 31, 2013	—
Granted	223
Forfeited	(12	)
Outstanding at December 31, 2014	211
As of December 31, 2014, there was approximately 517,000 unvested PRSUs with a fair value of $19.5 million. The Company expects to recognize the fair value of the unvested PRSUs over a weighted-average period of 1.20 years. In the first quarter of 2015, the Compensation Committee certified actual performance achievement for PRSUs granted in 2014, and as a result, 138,000 shares out of the 211,000 shares became eligible to vest.
Disclosures Pertaining to All Stock-based Compensation Plans
The weighted-average fair value of options granted during 2014, 2013, and 2012 was $11.02, $8.96, and $12.06, respectively. No options were granted with exercise prices less than fair value at the date of grant in 2014, 2013, and 2012. The total intrinsic value of options exercised for the years ended, December 31, 2014, 2013, and 2012 was $70.5 million, $58.4 million, and $53.5 million, respectively. The weighted average grant date fair value of unvested RSUs for the years ended December 31, 2014, 2013, and 2012 was $36.93, $38.50, and $38.08, respectively. The RSUs granted in 2014 vest in 2015 through 2018. The weighted-average grant date fair value of unvested PRSUs for the year ended December 31, 2014 was $37.76. The weighted-average grant date fair value of employee stock purchase shares granted under the ESPP for the years ended December 31, 2014, 2013, and 2012 was $8.21, $10.01, and $9.93, respectively. The total intrinsic value of stock purchase shares granted under the ESPP exercised during the years ended December 31, 2014, 2013, and 2012 was $3.9 million, $6.5 million, and $2.8 million, respectively. Upon the exercise of options and stock purchase shares granted under the ESPP, the Company issues new common stock from its authorized shares.
Cash received from option exercises and ESPP contributions under all stock-based compensation arrangements for the years ended December 31, 2014, 2013, and 2012 were $59.0 million, $58.7 million, and $41.4 million, respectively. The total realized tax benefits attributable to stock options exercised and restricted stock units vested were $0.4 million, $26.1 million, and $16.5 million for the years ended December 31, 2014, 2013, and 2012, respectively. The gross excess tax benefits from stock-based compensation for the years ended December 31, 2014, 2013, and 2012 were $3.8 million, $27.5 million, and $17.0 million, respectively, as reported on the consolidated statements of cash flows in the financing activities section, which represent a reduction in income taxes otherwise payable during the periods. These amounts are related to the actual gross tax benefits in excess of the expected tax benefits for stock options exercised in 2014, 2013, and 2012.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss
	The following table summarizes the changes in accumulated balances for each component of other comprehensive income (loss), for the year ended December 31, 2014, 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 income (loss) as of December 31, 2013		$	(2,879	)	$	63			$	(396	)		$	(3,212	)
	Other comprehensive income (loss):
	Other comprehensive income (loss) before reclassifications, net of tax benefit (expense) of $664, $111 and $(483)		(28,433		)	(181		)		787				(27,827		)
	Net gain from discontinuance of cash flow hedges, net of tax expense of $-, $- and $(3)		—			—				6				6
	Net gain reclassified from accumulated other comprehensive income (loss), net of tax expense of $ —, $(7) and $(453)		—			(11		)	(i)	(739		)	(ii)	(750		)
	Net gain reclassified into earnings related to discontinuance of cash flow hedges, net of tax expense of $-, $- and $(3)		—			—				(6		)	(iii)	(6		)
	Total other comprehensive income (loss), net of tax effect (iv)		(28,433		)	(192		)		48				(28,577		)
	Accumulated other comprehensive loss as of December 31, 2014		$	(31,312	)	$	(129	)		$	(348	)		$	(31,789	)
	____________________
	(i)	The before-tax gain of $18 was included in other expense, net on the consolidated statements of income.
	(ii)	The before-tax gain of $287 and $905 were included in cost of service revenues and operating expenses, primarily research and development expense, respectively on the consolidated statements of income.
	(iii)	The before-tax gain of $2 and $7 were included in cost of service revenues and operating expenses, primarily research and development expense, respectively on the consolidated statements of income.
	(iv)	The tax expense related to the net gain reclassified from accumulated other comprehensive income (loss) was included in income tax provision on the consolidated statements of income.
	The following table summarizes the changes in accumulated balances for each component of other comprehensive income (loss), for the year ended December 31, 2013, 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, 2012		$	(8,012	)	$	242			$	(260	)		$	(8,030	)
	Other comprehensive income (loss):
	Other comprehensive income (loss) before reclassifications, net of tax benefit (expense) of $(172), $126 and $794		5,133			(205		)		(1,295		)		3,633
	Net loss reclassified from accumulated other comprehensive income (loss), net of tax benefit of $ —, $16 and $710		—			26			(i)	1,159			(ii)	1,185
	Total other comprehensive income (loss), net of tax effect (iii)		5,133			(179		)		(136		)		4,818
	Accumulated other comprehensive income (loss) as of December 31, 2013		$	(2,879	)	$	63			$	(396	)		$	(3,212	)
	____________________
	(i)	The before-tax loss of $42 was included in other expense, net on the consolidated statements of income.
	(ii)	The before-tax loss of $441 and $1,428 were included in cost of service revenues and operating expenses, primarily research and development expense, respectively on the 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 consolidated statements of income.
	The Company did not have any other-than-temporary gain or loss reflected in accumulated other comprehensive income (loss) as of December 31, 2014 and 2013.
	The Company determines the basis of the cost of a security sold and the amount reclassified out of other comprehensive income into statement of income based on specific identification.
	See Note 2. Summary of Significant Accounting Policies, Note 10. Derivative Financial Instruments, and Note 14. Commitments and Contingencies of Notes to Consolidated Financial Statements for a further discussion.

Derivative_Financial_Instrumen

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2014
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 twelve months. During 2014, an insignificant amount of gain was reclassified into earnings as a result of the discontinuance of cash flow hedges when it was not probable that the original forecasted transactions would occur by the end of the originally specified time period.
	The Company has forecasted the amount of its anticipated foreign currency expenses based on its historical performance and its projected financial plan. As of December 31, 2014, the remaining open foreign exchange contracts, carried at fair value, are hedging Indian rupee expenses and have a maturity of thirteen 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 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 foreign currency monetary assets or liabilities.
	The notional amounts of these foreign exchange forward contracts in U.S. dollar equivalents were to buy $45.9 million and $30.1 million of Indian rupees as of December 31, 2014 and 2013, 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 year end in U.S. dollar equivalents were to buy $10.6 million and $2.6 million at December 31, 2014 and 2013, respectively. The notional amounts of foreign currency contracts open at year end in U.S. dollar equivalents were to sell $57.1 million at December 31, 2014. There was no open foreign currency contracts to sell at December 31, 2013.
	The following table reflects the fair value amounts for the foreign exchange contracts designated and not designated as hedging instruments at December 31, 2014 and 2013 (in thousands):
		December 31, 2014						December 31, 2013
		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	$	141		$	761		$	284		$	830
	Derivatives not designated as hedging instruments	169			154			—			194
	Total fair value of derivative instruments	$	310		$	915		$	284		$	1,024
	____________________
	(i)	Included in prepaid expenses and other current assets on the consolidated balance sheets.
	(ii)	Included in accrued liabilities and other liabilities on the consolidated balance sheets.
	(iii)	Included in accrued liabilities on the consolidated balance sheets.
	The Company presents its derivative assets and derivative liabilities at gross fair values in the consolidated balance sheets. However, under the master netting arrangements 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 asset as of December 31, 2014 and 2013 (in thousands):
											Gross Amounts Not Offset
											in the Consolidated
											Balance Sheets
		Gross Amounts of			Gross Amounts Offset			Net Amounts of Assets			Financial			Cash		Net
		Recognized Assets			in the Consolidated			Presented			Instruments (i)			Collateral		Amount
					Balance Sheets			in the Consolidated
								Balance Sheets
	As of December 31,
	2014:00:00
	Foreign exchange contracts	$	310		$	—		$	310		$	(62	)	$	—	$	248
	As of December 31,
	2013:00:00
	Foreign exchange contracts	$	284		$	—		$	284		$	(268	)	$	—	$	16
	____________________
	(i)	The balances at December 31, 2014 and 2013 were related to derivative liabilities which are allowed to net settled against derivative assets in accordance with the master netting agreements.
	The following table sets forth the offsetting of derivative liabilities as of December 31, 2014 and 2013 (in thousands):
											Gross Amounts Not Offset
											in the Consolidated
											Balance Sheets
		Gross Amounts of			Gross Amounts Offset			Net Amounts of Liabilities			Financial					Net
		Recognized Liabilities			in the Consolidated			Presented			Instruments (ii)			Cash		Amount
					Balance Sheets			in the Consolidated						Collateral
								Balance Sheets
	As of December 31,
	2014:00:00
	Foreign exchange contracts	$	915		$	—		$	915		$	(62	)	$	—	$	853
	As of December 31,
	2013:00:00
	Foreign exchange contracts	$	1,024		$	—		$	1,024		$	(268	)	$	—	$	756
	____________________
	(ii)	The balances at December 31, 2014 and 2013 were related to derivative assets which are allowed to 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. In October 2013, the Company changed its effectiveness assessment method from the spot to spot price method to include time value in the assessment. Prospectively, the Company includes all changes in value that are effective including changes in time value to accumulated other comprehensive income. The Company no longer records amounts as an excluded component of the hedge relationship.
	The before-tax effects of derivative instruments designated as cash flow hedges on the accumulated other comprehensive income (loss) and consolidated statements of income for the years ended December 31, 2014, 2013, and 2012 are as follows (in thousands):
		Years Ended December 31,
		2014			2013			2012
	Amount of gain (loss) recognized in other comprehensive income (effective portion)	$	1,270		$	(2,089	)	$	(594	)
	Amount of gain (loss) reclassified from accumulated other comprehensive income to cost of service revenues and operating expenses (effective portion)	$	1,192		$	(1,869	)	$	(2,275	)
	Amount of gain recognized in income on derivatives for the amount excluded from effectiveness testing located in operating expenses	$	—		$	728		$	1,227
	Amount of loss on derivatives due to hedge ineffectiveness recognized in cost of service revenues and operating expenses	$	135		$	—		$	—
	The before-tax loss recognized in other expense, net for non-designated foreign currency forward contracts for the years ended December 31, 2014, 2013, and 2012 is as follows (in thousands):
		Years Ended December 31,
2014			2013			2012
Loss recognized in interest and other expense, net	$	(152	)	$	(161	)	$	(904	)
See Note 2. Summary of Significant Accounting Policies and Note 9. Accumulated Other Comprehensive Loss, and Note 14. Commitments and Contingencies of Notes to Consolidated Financial Statements for a further discussion.

Employee_401K_Plan

Employee 401(K) Plan	12 Months Ended
	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Employee 401(K) Plan	Employee 401(K) Plan
	The Company's employee savings and retirement plan (the “Plan”) is qualified under Section 401 of the Internal Revenue Code. The Plan is available to all regular employees on the Company's U.S. payroll and provides employees with tax deferred salary deductions and alternative investment options. Employees may contribute up to 50% of their salary up to the statutory prescribed annual limit. The Company matches 50% of the contribution made by an employee, up to a maximum of $4,000 per calendar year. Contributions made by the Company vest 100% upon contribution. The Company contributed $5.2 million, $4.5 million, and $3.6 million for the years ended December 31, 2014, 2013, and 2012 respectively. In addition, the Plan provides for discretionary contributions at the discretion of the Board of Directors. No discretionary contributions have been made by the Company to date.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes
	The federal, state, and foreign income tax provisions for the years ended December 31, 2014, 2013, and 2012 are summarized as follows (in thousands):
		Years Ended December 31,
		2014			2013			2012
	Current tax provision:
	Federal	$	39,903		$	65,344		$	35,481
	State	7,982			10,167			4,337
	Foreign	9,704			2,882			9,417
	Total current tax provision	57,589			78,393			49,235
	Deferred tax provision:
	Federal	(859		)	(24,469		)	(3,044		)
	State	1,686			(3,334		)	597
	Foreign	(2,210		)	3,737			(2,203		)
	Total deferred tax provision	(1,383		)	(24,066		)	(4,650		)
	Total provision for income taxes	$	56,206		$	54,327		$	44,585
	The components of income before income taxes attributable to domestic and foreign operations are as follows (in thousands):
		Years Ended December 31,
		2014			2013			2012
	Domestic	$	128,857		$	118,939		$	87,981
	Foreign	41,436			21,783			49,786
	Income before income taxes	$	170,293		$	140,722		$	137,767
	A reconciliation of the provision computed at the statutory federal income tax rate to the Company's income tax provision is as follows (in thousands):
		Years Ended December 31,
		2014			2013			2012
	Income tax provision computed at federal statutory tax rate	$	59,603		$	49,253		$	48,218
	State taxes, net of federal benefit	5,970			4,208			3,276
	Foreign earnings taxed at different rates	(4,292		)	5,395			(9,557		)
	Stock-based compensation	4,475			3,397			3,270
	Return to provision true-up	(2,238		)	(668		)	92
	Research and development tax credits	(2,707		)	(3,715		)	—
	Domestic manufacturing deduction	(4,025		)	(3,150		)	(2,100		)
	Other	(580		)	(393		)	1,386
	Total provision for income taxes	$	56,206		$	54,327		$	44,585
	The higher tax rate for 2013 was primarily attributable to non-deductible stock-based compensation, state income taxes, the accrual of reserves related to uncertain tax positions and acquisition integration related income tax expenses resulted in higher taxes in our foreign earnings partially offset by the domestic manufacturing deduction pursuant to Section 199 of the Internal Revenue Code and the recognition of the 2012 and 2013 federal research and development credits.
	Significant components of the Company's deferred tax assets are as follows (in thousands):
		December 31,
		2014			2013
	Deferred tax assets:
	Net operating loss carryforwards	$	28,168		$	23,710
	Tax credits carryforwards	9,883			10,131
	Deferred revenue	18,198			19,240
	Reserves and accrued costs not currently deductible	15,984			15,097
	Depreciable assets	7,767			6,450
	Stock-based compensation	23,814			20,149
	Other	2,100			381
	Valuation allowance	(8,298		)	(4,552		)
	Total deferred tax assets	97,616			90,606
	Deferred tax liabilities:
	Non-deductible intangible assets (i)	(18,717		)	(12,887		)
	Total deferred tax liabilities	(18,717		)	(12,887		)
	Net deferred tax assets	$	78,899		$	77,719
	__________________
	(i)	The Company included approximately $44 thousand of long-term deferred tax liabilities in other liabilities on the consolidated balance sheet as of December, 31, 2013.
	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 2014, 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 year ended December 31, 2014, it was considered more likely than not that our deferred tax assets would be realized except for any increase to the deferred tax asset related to the California research and development credit and operating losses incurred in certain foreign jurisdictions. A valuation allowance of $5.6 million has been recorded against this portion of the credit, even though this tax attribute has an indefinite life.
	As of December 31, 2014, the Company had U.S. federal and state net operating loss carryforwards of approximately $71.4 million and $2.2 million, respectively.  If not utilized, the federal and state net operating loss carryforwards will start to expire in 2015.  The Company has state research and development tax credit carryforwards of approximately $6.2 million that do not expire.  The utilization of the Company's U.S. net operating losses is subject to various limitations under Section 382 and similar state tax provisions. The Company does not anticipate any expiration of the U.S. net operating loss carryforwards prior to their utilization.
	As of December 31, 2014, the Company’s international subsidiaries had combined net operating loss carryforwards of $2.7 million that do not expire. The Company believed that it is more likely than not that the benefit from some of these net operating loss carryforwards will not be realized and provided a full valuation allowance relating to these net operating loss carryforwards.
	The Company has not provided for U.S. federal and foreign withholding taxes on $128.2 million of undistributed earnings from its foreign subsidiaries as of December 31, 2014 because the Company intends to indefinitely reinvest such earnings offshore. The Company makes the determination of whether to accrue taxes on such earnings on an entity by entity basis. The residual tax liability if such earnings were remitted may be reduced by foreign tax credits and other tax adjustments. It is not practicable to determine the tax liability that might be incurred if these earnings were repatriated.
	A reconciliation of the beginning and ending amount of the unrecognized tax benefits is as follows (in thousands):
		December 31,
		2014			2013			2012
	Beginning balance	$	29,174		$	21,079		$	16,298
	Additions for tax positions of prior years	2,283			672			2,407
	Reductions for tax positions of prior years	(636		)	(668		)	(475		)
	Additions based on tax positions related to the current year	5,429			9,671			4,335
Reductions due to lapse of statute of limitations	(2,893		)	(1,580		)	(1,486		)
Reductions due to settlements	(162		)	—			—
Ending balance	$	33,195		$	29,174		$	21,079
The unrecognized tax benefits, if recognized, would impact the income tax provision by $27.1 million, $25.9 million, and $18.9 million for the years ended December 31, 2014, 2013, and 2012, respectively. The unrecognized tax benefits were $33.2 million, $29.2 million, and $21.1 million as of December 31, 2014, 2013, and 2012, respectively. The Company has elected to include interest and penalties as a component of income tax expense. Accrued interest and penalties at December 31, 2014 and 2013 were approximately $2.1 million and $3.2 million, respectively. The Company does not anticipate that the amount of existing unrecognized tax benefits will significantly increase or decrease within the next 12 months.
The Company files income tax returns in the U.S. federal jurisdiction and in various U.S. states and foreign jurisdictions. As of December 31, 2014, the Company is in various stages of examinations and appeals in connection with its taxes in U.S. states and foreign jurisdictions, which generally span tax years 2004 through 2012.
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 such 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 the reserve to be reasonable. If tax payments are ultimately proved to be unnecessary, the reversal of these tax liabilities would result in tax benefits in the period when the Company concluded such determination. 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	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Net Income per Common Share	Net Income per Common Share
	Basic net income per share is computed using the weighted-average number of common shares outstanding during the period. Diluted net income per share reflects the potential dilution of securities by adding other common stock equivalents, primarily stock options and restricted stock units, to the weighted-average number of common shares outstanding during the period, if dilutive. Potentially dilutive securities have been excluded from the computation of diluted net income per share if their inclusion is anti-dilutive.
	The calculation of basic and diluted net income per share is as follows (in thousands, except per share amounts):
		Years Ended December 31,
		2014		2013		2012
	Net income	$	114,087	$	86,395	$	93,182
	Weighted-average shares of common stock used to compute basic net income per share	109,199		108,146		107,874
	Effect of dilutive common stock equivalents:
	Dilutive effect of employee stock options	1,004		2,925		3,863
	Dilutive effect of unvested restricted stock units	757		323		352
	Weighted-average shares of common stock used to compute diluted net income per share	110,960		111,394		112,089
	Net income per share-basic	$	1.04	$	0.8	$	0.86
	Net income per share-diluted	$	1.03	$	0.78	$	0.83
	Weighted average stock options and restricted stock units excluded from calculation due to anti-dilutive effect	5,166		5,666		3,844

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
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. Rental expense was $14.7 million, $16.3 million, and $15.1 million in 2014, 2013, and 2012, respectively.
	Future minimum lease payments as of December 31, 2014 under non-cancelable operating leases with original terms in excess of one year are summarized as follows (in thousands):
		Operating
		Leases
	2015	$	11,709
	2016	9,733
	2017	8,326
	2018	7,697
	2019	6,169
	Thereafter	8,363
	Total future minimum operating lease payments	$	51,997
	Warranties
	The Company generally provides a warranty for its software products and services to its customers for a period of three to six months and accounts for its warranties. 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 December 31, 2014 and 2013 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 December 31, 2014. 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 2. Summary of Significant Accounting Policies, Note 9. Accumulated Other Comprehensive Loss, and Note 10. Derivative Financial Instruments of Notes to Consolidated Financial Statements for a further discussion.

Litigation

Litigation	12 Months Ended
	Dec. 31, 2014
Loss Contingency [Abstract]
Litigation	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.

Related_Party_Transaction

Related Party Transaction	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transaction
	Mark A. Bertelsen, a director of the Company since September 2002, serves as a member of Wilson Sonsini Goodrich & Rosati (“WSGR”), our principal outside legal counsel. Fees paid by the Company to WSGR for legal services rendered for the years ended December 31, 2014, 2013, and 2012 were $1.0 million, $1.9 million, and $1.0 million, respectively. The Company believes that the services rendered by WSGR were provided on terms no more or less favorable than those with unrelated parties.

Significant_Customer_Informati

Significant Customer Information and Segment Information	12 Months Ended
	Dec. 31, 2014
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 2014, 2013, and 2012. At December 31, 2014 and 2013, 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 34%, 32% and 35% of total revenues in 2014, 2013, and 2012, respectively.
	Total revenue by geographic region is summarized as follows (in thousands):
		Years Ended December 31,
		2014		2013		2012
	Revenues:
	North America	$	688,186	$	642,707	$	524,191
	Europe, the Middle East, and Africa	241,785		211,504		202,861
	Other	117,983		93,960		84,519
	Total revenues	$	1,047,954	$	948,171	$	811,571
	Property and equipment, net by geographic region is summarized as follows (in thousands):
		December 31,
		2014		2013
	Property and equipment, net:
	North America	$	143,482	$	147,460
	Europe, the Middle East, and Africa	10,902		4,907
	Other	5,324		4,941
	Total property and equipment, net	$	159,708	$	157,308
	The Company derives revenues from sales of software licenses, subscription-based licenses for a variety of cloud and data-as-a-service offerings, maintenance and support services, and professional services, consisting of consulting and education services. It is impracticable to disaggregate software license and subscription revenues by product. The Company's disaggregated revenue information is as follows (in thousands):
		Years Ended December 31,
		2014		2013		2012
	Software revenues:
	License	$	387,660	$	367,074	$	320,982
	Subscription	69,704		46,664		29,193
	Total software revenues	457,364		413,738		350,175
	Service revenues:
	Maintenance	456,718		409,325		360,769
	Consulting and education	133,872		125,108		100,627
	Total service revenues	590,590		534,433		461,396
	Total revenues	$	1,047,954	$	948,171	$	811,571

Selected_Quarterly_Financial_I

Selected Quarterly Financial Information (Unaudited)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Financial Information (Unaudited)	Selected Quarterly Financial Information (Unaudited)
		Three Months Ended
		December 31,		September 30,		June 30,		March 31,
		2014		2014		2014		2014
		(In thousands, except per share data)
	Total revenues	$	303,744	$	250,400	$	250,713	$	243,097
	Gross profit	$	252,390	$	200,320	$	201,634	$	195,764
	Income from operations	$	65,440	$	33,405	$	33,826	$	36,817
	Net income	$	43,592	$	22,813	$	22,829	$	24,853
	Net income per common share:
	Basic	$	0.4	$	0.21	$	0.21	$	0.23
	Diluted	$	0.4	$	0.21	$	0.2	$	0.22
	Shares used in computing net income per common share:
	Basic	108,663		109,231		109,739		109,164
	Diluted	109,988		110,314		111,601		111,935
		Three Months Ended
		December 31,		September 30,		June 30,		March 31,
		2013		2013		2013		2013
		(In thousands, except per share data)
	Total revenues	$	276,038	$	235,394	$	222,439	$	214,300
	Gross profit	$	228,794	$	189,838	$	177,854	$	170,404
	Income from operations	$	61,027	$	27,206	$	25,931	$	24,699
	Net income	$	39,918	$	10,404	$	18,166	$	17,907
	Net income per common share:
	Basic	$	0.37	$	0.1	$	0.17	$	0.17
	Diluted	$	0.36	$	0.09	$	0.16	$	0.16
	Shares used in computing net income per common share:
	Basic	108,462		108,305		108,138		107,669
	Diluted	111,457		111,501		111,344		111,263

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Acquisitions	Acquisitions
	Acquisitions in 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
	Acquisition in 2013:
	Active Endpoints
	In February 2013, the Company acquired Active Endpoints, Inc. (“Active Endpoints”), a privately-held company, for approximately $10.0 million in cash. Active Endpoints designs, markets, and supports on-premise and cloud based process automation software solutions. Total assets acquired and liabilities assumed were approximately $10.0 million of which approximately $7.1 million was allocated to goodwill, $3.8 million was allocated to identifiable intangible assets, and $0.9 million to net liabilities assumed. The goodwill is not deductible for tax purposes.
	Approximately $1.5 million of the consideration otherwise payable to former Active Endpoints stockholders was placed into an escrow and held as partial security for certain indemnification obligations. The entire escrow fund was released in the second quarter of 2014.
	Heiler Software AG
	In November 2012, the Company acquired a majority interest in the shares of Heiler Software, a publicly-traded German company, at the end of the initial acceptance period of the takeover offer. The Company purchased the majority interest for approximately $101.9 million. Heiler Software provides enterprise product information management, MDM and procurement solutions that enable retailers, distributors and manufacturers to manage product information across channels and data sources. As of December 31, 2012, the Company held approximately 97.7 percent of the outstanding shares of Heiler Software. During December 2012 and the first half of 2013, the Company acquired other shareholders' interest in Heiler Software for approximately $6.8 million, which extinguished recorded liabilities to noncontrolling shareholders. Total cash consideration was approximately $108.7 million. The squeeze-out of the remaining shareholders was effective in the second quarter of 2013, increasing the Company's ownership in Heiler Software to 100 percent.
	The fair value of the noncontrolling interest in Heiler Software at the acquisition date was $2.9 million. The valuation techniques and significant inputs used to measure the fair value of the noncontrolling interest included quoted market prices.
	The following table summarizes the fair value of assets acquired and liabilities assumed at the acquisition date (in thousands):
	Net tangible assets	$	16,400
	Identifiable intangible assets:
	Developed and core technology	16,586
	Customer relationships	5,339
	Contract backlog	648
	Trade names	298
	In-process research and development	3,784
	Noncontrolling interest	(2,861		)
	Total identifiable net assets	40,194
	Goodwill	61,660
	Total cash consideration	$	101,854
	During the first quarter of 2013, the Company recorded $2.8 million of additional accrued liabilities during the measurement period. The goodwill is not deductible for tax purposes.
	The Company’s business combinations completed in 2014 and 2013, either individually or in aggregate, did not have a material impact on the Company’s consolidated financial statements, and therefore pro forma disclosures have not been presented. The Company included the financial results of these acquired companies in its consolidated financial statements from their respective acquisition dates.

Subsequent_Event

Subsequent Event	12 Months Ended
	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event
	In February 2015, the Company entered into two separate accelerated share repurchase ("ASR") agreements with two financial institutions to repurchase an aggregate of $300 million of the Company's common stock. Under the ASR agreements, the Company 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 the Company will repurchase under the ASR agreements will be based generally upon the daily volume-weighted average price of the Company’s common stock during the repurchase period, less an agreed upon discount during the term of the transactions. The final settlement of the ASR agreements is expected to occur no later than the second quarter of 2015.

Schedule_II_Valuation_and_Qual

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]
Schedule II - Valuation and Qualifying Accounts	Schedule II - Valuation and Qualifying Accounts
	(In thousands)
		Balance		Charged to			Additions		Deductions			Balance
		at Beginning		Costs and								at End
	Description	of Period		Expenses								of Period
	Provision for Doubtful Accounts:
	Year ended December 31, 2014	$	4,135	$	(369	)	$	217	$	(518	)	$	3,465
	Year ended December 31, 2013	$	5,460	$	(1,157	)	$	6	$	(174	)	$	4,135
	Year ended December 31, 2012	$	4,001	$	428		$	1,139	$	(108	)	$	5,460

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation
	The 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.
Use of Estimates	Use of Estimates
	The Company's consolidated financial statements are prepared in accordance with generally accepted accounting principles (“GAAP”) in the United States, which require the Company 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 upon information available to it 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 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.
Reclassifications	Reclassifications
	Certain reclassifications have also been made within the consolidated balance sheet as of December 31, 2013 to conform to the current year presentation. The Company reclassified $0.9 million out of accounts payable and into accrued liabilities and $9.2 million out of accrued liabilities into accrued compensation and related expenses. Total current liabilities as of December 31, 2013 did not change as a result of these reclassifications.
	Certain reclassifications have also been made within the 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.
Revenue Recognition	Revenue Recognition
	The Company derives its revenues from sales of software licenses, subscription-based licenses for a variety of cloud, and data-as-a-service offerings, maintenance and support services, and professional services, consisting of consulting and education services. The Company recognizes revenue in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 985-605, Software Revenue Recognition, ASC 605-25, Multiple Element Arrangements, ASC 605-35, Revenue Recognition for Construction-Type and Production-Type Contracts, the Securities and Exchange Commission's Staff Accounting Bulletin Topic 13, Revenue Recognition, and other authoritative accounting literature.
	Revenue is recognized when persuasive evidence of an arrangement exists, delivery has occurred, the fee is fixed or determinable, and collection is probable.
	Multiple Element Arrangements
	The Company enters into multiple element arrangements that contain software and software-related elements, such as software licenses, subscription-based licenses, maintenance and support, consulting, and education services. The Company uses the residual method to allocate revenue to the software license and recognize license revenue upon delivery when vendor-specific objective evidence (“VSOE”) of fair value exists for all undelivered elements of the arrangement. If VSOE does not exist for any undelivered software product element of the arrangement, all revenue is deferred until all elements have been delivered, or VSOE is established. If VSOE does not exist for any undelivered services elements of the arrangement, all revenue is recognized ratably over the period that the services are expected to be performed.
	The Company enters into multiple element arrangements that contain both software, such as software licenses, and deliverables not within the scope of ASC 985-605, such as cloud offerings. The Company first allocates the total arrangement consideration based on the relative selling prices of the software group of elements as a whole, and to the elements not within the scope of ASC 985-605. The allocation of arrangement consideration is based on the selling price hierarchy, which includes (i) VSOE if available, (ii) third party evidence (“TPE”) if VSOE is not available, or (iii) estimated selling price (“ESP”) if neither VSOE nor TPE is available. The Company then further allocates consideration within the software group to the respective elements within that group following the guidance in ASC 985-605. Revenue allocated to each element is then recognized when the basic revenue recognition criteria are met for each element as described above.
	The Company establishes VSOE for each element based on the price charged when an element is sold separately. In certain limited instances, the Company is not able to establish VSOE for all deliverables in an arrangement with multiple elements. This may be due to the infrequent selling of each element separately, not pricing products or services within a narrow range, or only having a limited sales history.
	For multiple element arrangements that contain both software and deliverables not within the scope of ASC 985-605, when VSOE cannot be established for deliverables not within the scope of ASC 985-605, the Company attempts to establish a selling price based on TPE. TPE is determined based on competitor prices for similar deliverables when sold separately. When the Company is unable to establish a selling price using VSOE or TPE, the Company uses ESP in the allocation of the arrangement consideration. The Company determines ESP by reviewing historical transactions, including transactions whereby the deliverable was sold on a standalone basis and considering several other external and internal factors including, but not limited to, pricing practices including discounting levels dependent on the size of transactions, whether an order represents an upgrade of a previous order and the type of customer. The determination of ESP is made through consultation with the Company's management, taking into consideration the Company's pricing practices and go-to-market strategy.
	Software
	Under ASC 985-605, revenue is recognized when persuasive evidence of an arrangement exists, delivery has occurred, the fee is fixed or determinable, and collection is probable.
	Persuasive evidence of an arrangement exists.  The Company determines that persuasive evidence of an arrangement exists when it has a written contract, signed by both the customer and the Company, and written purchase authorization.
	Delivery has occurred.  Software is considered delivered when title to the physical software media passes to the customer or, in the case of electronic delivery, when the customer has been provided with the access codes to download and operate the software.
	Fee is fixed or determinable.  The Company considers arrangements with extended payment terms not to be fixed or determinable. The Company also consider factors including financing arrangements, the category of customer (end-user customer, distributor, or reseller), rights of return or refund, and history of enforcing terms and conditions of customer contracts. If the license fee in an arrangement is not fixed or determinable, revenue is recognized as payments become due or upon cash receipt, whichever is earlier. The Company's standard agreements do not contain product return rights.
	Collection is probable.  The Company first assesses the credit-worthiness and collectability at a country level based on the country's overall economic climate and general business risk. Then, for the customers in the countries that are deemed credit-worthy, it assesses credit and collectability based on their payment history and credit profile. When a customer is not deemed credit-worthy, revenue is recognized at the time that payment is received.
	The Company requires evidence of sell-through from resellers and distributors for order acceptance. The Company then recognizes revenue from resellers and distributors upon shipment if all other revenue recognition criteria are met, which in substantially all cases is when cash is collected or when the reseller or distributor is deemed credit-worthy based on their payment history and credit profile to conclude that collectability is probable.
	The Company also enters into Original Equipment Manufacturer (“OEM”) arrangements that provide for license fees based on inclusion of technology and/or products in the OEM's products. These arrangements provide for fixed and irrevocable royalty payments. The Company recognizes royalty payments as revenues based on the royalty report that it receives from the OEMs. In the case of OEMs with fixed royalty payments, revenue is recognized upon execution of the agreement, delivery of the software, and when all other criteria for revenue recognition have been met.
	Multiple contracts with a single counterparty executed within close proximity of each other are evaluated to determine if the contracts should be combined and accounted for as a single arrangement. The Company recognizes revenues net of applicable sales taxes, financing charges absorbed by the Company, and amounts retained by our resellers and distributors, if any.
	Subscription revenues, primarily consisting of revenues from customers and partners under subscription-based licenses for a variety of cloud and data-as-a-service offerings, are recognized ratably over the subscription term.
	Services
	The Company recognizes maintenance revenues, which consist of fees for ongoing support and product updates, if and when available, ratably over the term of the contract, typically one year.
	Consulting revenues are primarily related to configuration, installation, and implementation of our products. These services are generally performed on a time-and-materials basis and, accordingly, revenues are recognized as the services are performed. Occasionally, contracts are on a fixed-fee basis and, accordingly, revenues are recognized on a proportional performance model based on actual services performed. If uncertainty exists about the Company's ability to complete the project, ability to collect the amounts due, or in the case of fixed-fee consulting arrangements, ability to estimate the remaining costs to be incurred to complete the project, revenue is deferred until the uncertainty is resolved. Consulting services, if included as part of the software arrangement, generally do not require significant modification or customization of the software and are not considered essential to the functionality of the software. If, in the Company's judgment, the software arrangement includes significant modification or customization of the software, then software license revenue is recognized as the consulting services revenue is recognized.
	Education service revenues are generated from classes offered at our headquarters, sales and training offices, customer locations, and on-line. Revenues are recognized as the classes are delivered.
	Deferred Revenues
	Deferred revenues include deferred license, subscription, maintenance, consulting, and education revenues. For customers not deemed credit-worthy, the Company's practice is to net unpaid deferred revenue for that customer against the related receivable balance.
Cash and Cash Equivalents	Cash and Cash Equivalents
	The Company considers highly liquid investment securities with maturities of 90 days or less at the date of purchase to be cash equivalents. Cash equivalents include money market funds, time deposits, and marketable debt securities. Cash and cash equivalents outside of marketable debt securities are stated at cost, which approximates fair value.
Investments	Investments
	Investments are comprised of time deposits and marketable debt securities. The Company's marketable debt securities consist primarily of certificates of deposit, commercial paper, corporate notes and bonds, U.S. government and agency notes and bonds, and municipal securities with original maturities beyond 90 days. The Company's marketable debt securities are classified as available-for-sale and are reported at fair value, with unrealized gains and losses, net of tax, reported as a separate component of accumulated other comprehensive income (loss) in stockholders' equity. The Company classifies all available-for-sale marketable debt securities, including those with original maturity dates greater than one year, as short-term investments. Realized gains or losses and permanent declines in value, if any, on available-for-sale securities are reported in other income (expense) as incurred. The Company recognizes realized gains and losses upon sales of investment and reclassifies unrealized gains and losses out of accumulated other comprehensive income (loss) into earnings using the specific identification method.
	In accordance with ASC 320, Investments - Debt and Equity Securities, the Company periodically evaluates the investments for other-than-temporary impairment. The Company considers factors such as the length of time and extent to which the investment has been in a continuous unrealized loss position, the financial condition and near-term prospects of the issuer, and the Company's intent to sell, or whether it is more likely than not the Company will be required to sell the investment before recovery of the investment's amortized cost basis. The Company also considers industry analysts' reports and credit ratings in evaluating for other-than-temporary impairment. If the Company believes that an other-than-temporary decline exists, the Company will write down the investment to its fair value. During 2014, 2013, and 2012, the Company did not consider any of its short-term investments to be other-than-temporarily impaired.
	The Company also has investments in privately-held companies that are accounted for under the cost method and included in other non-current assets. The Company periodically evaluates these investments for other-than-temporary impairment. During 2014, the Company realized a loss of $2.0 million on the investment in a privately-held company. During 2013 and 2012, the Company did not consider these investments to be other-than-temporarily impaired.
Allowance for Doubtful Accounts	Allowance for Doubtful Accounts
	The Company makes estimates as to the overall collectability of accounts receivable and provides an allowance for accounts receivable considered uncollectible. The Company specifically analyzes its accounts receivable based on historical bad debt experience, customer concentrations, customer credit-worthiness, the age of the receivable, current economic trends, and changes in its customer payment terms when evaluating the adequacy of the allowance for doubtful accounts. The Company records the adjustment in general and administrative expense.
Property and Equipment	Property and Equipment
	Property and equipment are stated at cost, net of accumulated depreciation. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets. Building, building improvements, and site improvements are amortized over the estimated useful life of 25 years, 10-15 years and 15 years, respectively. Leasehold improvements are amortized over the shorter of the lease term or the estimated useful life of the asset, which range from one to ten years. Computers and equipment and furniture and fixtures are stated at cost and depreciated using the straight-line method over the estimated useful lives of the assets, generally one to five years.
Software Development Costs	Software Development Costs
	The Company accounts for software development costs in accordance with ASC 985-20, Costs of Software to Be Sold, Leased, or Marketed. Software development costs are expensed as incurred until the establishment of technological feasibility, at which time those costs are capitalized until the product is available for general release to customers and amortized over the estimated life of the product. Technological feasibility is established upon completion of a working model. To date, costs incurred subsequent to the establishment of technological feasibility have not been significant, and all software development costs have been charged to research and development expense in the accompanying consolidated statements of income.
	Pursuant to ASC 350-40, Internal - Use Software, the Company capitalizes certain costs relating to software acquired, developed, or modified solely to meet the Company's internal requirements and for which there are no substantive plans to market the software.
Business Combinations	Business Combinations
	The Company records the acquired tangible and intangible assets and liabilities assumed based on their estimated fair values at the acquisition date. Goodwill as of the acquisition date is measured as the excess of consideration transferred and the net of the acquisition fair values of the assets acquired and the liabilities assumed. The valuation process requires management to make significant estimates and assumptions, especially at the acquisition date with respect to intangible assets, support obligations assumed, estimated restructuring liabilities, and pre-acquisition contingencies.
	In connection with the measurement process for acquisitions, the Company estimates the fair value of the support obligations assumed. The estimated fair value of the support obligations is determined utilizing a cost build-up approach by estimating the costs related to fulfilling the obligations plus a normal profit margin. The estimated costs to fulfill the support obligations are based on the historical costs related to fulfilling the obligations. The sum of these costs and operating profit approximates, in theory, the amount that we would be required to pay a third party to assume the support obligations.
	The Company expenses transaction costs and restructuring expenses related to the acquisition as incurred. Additionally, the Company identifies pre-acquisition contingencies and determines their respective fair values as of the end of the purchase price allocation period. Any adjustments to pre-acquisition contingencies are recorded in the Company's operating results in the period in which the adjustment is determined. Furthermore, any adjustments to estimates of acquisition related tax contingencies are recorded to goodwill during the measurement period, and in the Company's operating results after the conclusion of the measurement period. Moreover, the Company identifies in-process research and development costs and classifies them as an indefinite lived intangible asset until the asset is put to use or deemed to be impaired.
Goodwill and Indefinite-Lived Intangible Assets	Goodwill and Indefinite-Lived Intangible Assets
	The Company tests goodwill and intangible assets with indefinite useful lives for impairment annually on October 31 of each year and whenever events or changes in circumstances indicate that the carrying value of the asset may not be recoverable in accordance with ASC 350, Intangibles - Goodwill and Other. While the Company is permitted to conduct a qualitative assessment to determine whether it is necessary to perform a two-step quantitative goodwill impairment test, for its annual goodwill impairment test in the fourth quarter of 2014, the Company performed a quantitative test for its reporting unit.
	Consistent with the Company's assessment that it has only one reporting segment, the Company has determined that it has only one reporting unit and tests goodwill for impairment at the entity level. The Company tests its goodwill using the two-step process in accordance with ASC 350. In the first step, the Company compares the carrying amount of the reporting unit to the fair value based on quoted market prices of the Company's common stock. If the fair value of the reporting unit exceeds the carrying value, goodwill is not considered impaired and no further testing is required. If the carrying value of the reporting unit exceeds the fair value, goodwill is potentially impaired and the second step of the impairment test must be performed. In the second step, the Company compares the implied fair value of the goodwill, as defined by ASC 350, to its carrying amount to determine the impairment loss, if any. Recoverability of indefinite-lived intangible assets is measured by comparison of the carrying amount of the asset to the future undiscounted cash flows attributable to that asset.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets
	The Company evaluates long-lived assets, which includes amortized intangible assets and tangible assets, for impairment whenever events or changes in circumstances indicate that the carrying value of these assets may not be recoverable. Recoverability of these assets is measured by comparison of the carrying amount of an asset to the future undiscounted cash flows attributable to that asset. The Company measures any amount of impairment based on the difference between the carrying value and the fair value of the impaired asset.
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 debt securities.
	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.
	The Company's marketable debt 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 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 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 its 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 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 thirteen 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 years ended December 31, 2014 and 2013.
	See Note 9. Accumulated Other Comprehensive Loss, Note 10. Derivative Financial Instruments, and Note 14. Commitments and Contingencies of Notes to Consolidated Financial Statements for a further discussion.
	Acquisition-related Contingent Consideration
	The Company estimated the fair value of the acquisition-related contingent consideration using a probability-weighted discounted cash flow model. This fair value measure was based on significant inputs not observed in the market and thus represented a Level 3 instrument. Level 3 instruments are valued based on unobservable inputs that are supported by little or no market activity and reflect the Company's own assumptions in measuring fair value. There were no transfers into or out of the Level 3 category during the years ended December 31, 2014 and 2013. The change in fair value of acquisition-related contingent consideration is included in acquisitions and other charges in the consolidated statements of income.
	The changes in the acquisition-related contingent consideration liability for the year ended December 31, 2014 consisted of the following (in thousands):
		December 31, 2014
	Beginning balance as of December 31, 2013	$	3,071
	Change in fair value of contingent consideration	(10		)
	Payment of contingent consideration	(3,061		)
	Ending balance as of December 31, 2014	$	—
	Fair Value of Assets and Liabilities on a Nonrecurring Basis
	The Company has direct investments in privately held companies accounted for under the cost method, which are periodically assessed for other-than-temporary impairment. The carrying value of these investments was $2.3 million and $4.1 million at December 31, 2014 and 2013, respectively. If it is determined that an other-than-temporary impairment has occurred, the Company writes down the investment to its fair value. The Company estimates fair value of cost method investments considering available information such as pricing in recent rounds of financing, current cash positions, earnings and cash flow forecasts, recent operational performance, and any other readily available data.
Fair Value of Financial Instruments, Concentrations of Credit Risk and Credit Evaluations	Fair Value of Financial Instruments, Concentrations of Credit Risk, and Credit Evaluations
	The fair value of the Company's cash, cash equivalents, short-term investments, accounts receivable, and accounts payable approximates their respective carrying amounts due to their short-term maturity.
	Financial instruments, which subject the Company to concentrations of credit risk, consist primarily of cash, cash equivalents, investments in time deposits and marketable debt securities, and trade accounts receivable. The Company maintains its cash and cash equivalents and investments with financial institutions with high credit standing.
	The Company performs ongoing credit evaluations of its customers and generally does not require collateral. The Company makes judgments as to its ability to collect outstanding receivables and provide allowances for the portion of receivables when collection becomes doubtful. Provisions are made based upon a specific review of all significant outstanding invoices. For those invoices not specifically reviewed, provisions are provided at differing rates, based upon the age of the receivable. In determining these percentages, the Company analyzes its historical collection experience and current economic trends. If the historical data it uses to calculate the allowance for doubtful accounts does not reflect the future ability to collect outstanding receivables, additional provisions for doubtful accounts may be needed and the future results of operations could be materially affected. The Company evaluates its counterparties associated with the Company's foreign exchange forward contracts at least quarterly as part of its cash flow hedge program. Since all these counterparties are large credit-worthy commercial banking institutions, the Company does not consider counterparty non-performance to be a material risk.
Stock-based Compensation	Stock-based Compensation
	The Company accounts for stock-based compensation in accordance with the provisions of ASC 718, Stock Compensation. Stock-based awards granted include stock options, restricted stock units (“RSUs”), performance-based restricted stock units (“PRSUs”), and stock purchased under the Company's Employee Stock Purchase Plan. Stock-based compensation expense for stock options, RSUs, and stock purchased under the Employee Stock Purchase Plan is measured at the grant date based on the fair value of the awards and is recognized as an expense ratably on a straight line basis over the requisite service period. See Note 8. Stock-based Compensation for a description of the Company's stock-based compensation plans and more information on the assumptions used to calculate the fair value of stock-based awards.
	Stock-based compensation expense is recognized for PRSUs based on the probability of achieving certain performance criteria, as defined in the PRSU agreements. The Company estimates the number of PRSUs ultimately expected to vest and recognizes expense using the graded vesting attribution method over the requisite service period.
	Summary of Assumptions
	The fair value of each option award 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 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 fair value of RSUs and PRSUs is the grant date closing price of our common stock. 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 based on the probability of achieving certain performance criteria, as defined in the PRSU agreements, and uses 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.
Shipping and Handling Costs	Shipping and Handling Costs
	Shipping and handling costs in connection with our packaged software products are not material and are expensed as incurred in cost of software revenues in the Company's consolidated statements of income.
Advertising Expense	Advertising Expense
	Advertising costs are expensed as incurred.
Income Taxes	Income Taxes
	The Company uses the asset and liability method of accounting for income taxes in accordance with ASC 740, Income Taxes. Under this method, income tax expenses or benefits are recognized for the amount of taxes payable or refundable for the current year. In addition, deferred tax assets and liabilities are recognized for the expected future tax consequences of events that have been recognized in the Company's consolidated financial statements or tax returns. The measurement of current and deferred tax assets and liabilities is based on provisions of currently enacted tax laws. The effects of future changes in tax laws or rates are not contemplated.
	A two-step approach is applied pursuant to ASC 740 in the recognition and measurement of uncertain tax positions taken or expected to be taken in a tax return. The first step is to determine if the weight of available evidence indicates that it is more likely than not that the tax position will be sustained in an audit, including resolution of any related appeals or litigation processes. The second step is to measure the tax benefit as the largest amount that is more than 50% likely to be realized upon ultimate settlement. We recognize interest and penalties related to uncertain tax positions in our income tax provision line of our consolidated statements of income.
	As part of the process of preparing consolidated financial statements, we estimate our income taxes and tax contingencies in each of the tax jurisdictions in which we operate prior to the completion and filing of tax returns for such periods. This process involves estimating actual current tax expense together with assessing temporary differences resulting from differing treatment of items, such as deferred revenue, for tax and accounting purposes. These differences result in net deferred tax assets and liabilities. We must then assess the likelihood that the deferred tax assets will be realizable, and to the extent we believe that a deferred tax asset is not likely to be realized, we must establish a valuation allowance. In assessing the need for any additional valuation allowance, we considered all the evidence available to us, 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.
Foreign Currency Translation	Foreign Currency Translation
	The Company translates the assets and liabilities of its non-U.S. dollar functional currency subsidiaries into U.S. dollars using exchange rates in effect at the end of each period. Revenue and expenses for these subsidiaries are translated using rates that approximate those in effect during the period. Gains and losses from these translations are recognized in cumulative translation adjustments included in accumulated other comprehensive loss in stockholders’ equity.
Reporting Segments	Reporting Segments
	ASC 280, Segment Reporting, establishes standards for the manner in which public companies report information about operating segments in annual and interim financial statements. It also establishes standards for related disclosures about products and services, geographic areas, and major customers. The method for determining the information to report is based on the way management organizes the operating segments within the Company for making operating decisions and assessing financial performance.
	The Company's chief operating decision maker is the chief executive officer, who reviews financial information presented on a consolidated basis, accompanied by disaggregated information about revenues by revenue stream and geographic region for purposes of making operating decisions and assessing financial performance. On this basis, the Company is organized and operates in a single segment: the design, development, marketing, and sales of software solutions.
Recent Accounting Pronouncements	Recent Accounting Pronouncements
	In March 2013, the FASB issued Accounting Standards Update (“ASU”) 2013-05, Foreign Currency Matters (Topic 830): Parent's Accounting for the Cumulative Translation Adjustment upon Derecognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity. ASU 2013-05 clarifies that the cumulative translation adjustment (“CTA”) should be released into net income upon the occurrence of certain qualifying events. The Company adopted ASU 2013-05 prospectively as required on January 1, 2014. Adoption of ASU 2013-05 did not impact the Company's consolidated financial statements and disclosures.
	In July 2013, the FASB issued ASU 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists, which clarifies that an unrecognized tax benefit should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward if such settlement is required or expected in the event the uncertain tax position is disallowed. In situations where a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available or the tax law of the jurisdiction does not require, and the entity does not intend to use the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. The Company adopted ASU 2013-11 prospectively as required on January 1, 2014. Adoption of ASU 2013-11 did not have a material impact to the Company's 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 its consolidated financial statements and disclosures.
Derivatives, Offsetting Fair Value Amounts	The Company presents its derivative assets and derivative liabilities at gross fair values in the consolidated balance sheets. However, under the master netting arrangements 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. In October 2013, the Company changed its effectiveness assessment method from the spot to spot price method to include time value in the assessment. Prospectively, the Company includes all changes in value that are effective including changes in time value to accumulated other comprehensive income. The Company no longer records amounts as an excluded component of the hedge relationship.
Earnings Per Share	Basic net income per share is computed using the weighted-average number of common shares outstanding during the period. Diluted net income per share reflects the potential dilution of securities by adding other common stock equivalents, primarily stock options and restricted stock units, to the weighted-average number of common shares outstanding during the period, if dilutive. Potentially dilutive securities have been excluded from the computation of diluted net income per share if their inclusion is anti-dilutive.
Commitments and Contingencies	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.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
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 December 31, 2014 (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)	$	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	$	—
	The following table summarizes financial assets and financial liabilities that the Company measures at fair value on a recurring basis as of December 31, 2013 (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)	$	21,893		$	21,893	$	—	$	—
	Time deposits (ii)	21,585			21,585		—		—
	Marketable debt securities (ii)	370,384			—		370,384		—
	Total money market funds, time deposits, and marketable debt securities	413,862			43,478		370,384		—
	Foreign currency derivatives (iii)	284			—		284		—
	Total assets	$	414,146		$	43,478	$	370,668	$	—
	Liabilities:
	Foreign currency derivatives (iv)	$	1,024		$	—	$	1,024	$	—
	Acquisition-related contingent consideration (iv)	3,071			—		—		3,071
	Total liabilities	$	4,095		$	—	$	1,024	$	3,071
	___________________
	(i)	Included in cash and cash equivalents on the consolidated balance sheets.
	(ii)	Included in either cash and cash equivalents or short-term investments on the consolidated balance sheets.
	(iii)	Included in prepaid expenses and other current assets on the consolidated balance sheets.
	(iv)	Included in accrued liabilities on the consolidated balance sheets.
	(v)	Included in accrued and other liabilities on the consolidated balance sheets.
Schedule of Business Acquisitions by Acquisition, Contingent Consideration	The changes in the acquisition-related contingent consideration liability for the year ended December 31, 2014 consisted of the following (in thousands):
		December 31, 2014
	Beginning balance as of December 31, 2013	$	3,071
	Change in fair value of contingent consideration	(10		)
	Payment of contingent consideration	(3,061		)
	Ending balance as of December 31, 2014	$	—

Cash_Cash_Equivalents_and_Shor1

Cash, Cash Equivalents, and Short-Term Investments (Tables)	12 Months Ended
	Dec. 31, 2014
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Schedule of Cash, Cash Equivalents and Short-term Investments	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
	The following table summarizes the Company’s cash, cash equivalents, and short-term investments as of December 31, 2013 (in thousands):
				Gross			Gross			Estimated
		Cost		Unrealized			Unrealized			Fair Value
				Gains			Losses
	Cash	$	263,572	$	—		$	—		$	263,572
	Cash equivalents:
	Money market funds	21,893		—			—			21,893
	U.S. government notes and bonds	12,353		—			—			12,353
	Total cash equivalents	34,246		—			—			34,246
	Total cash and cash equivalents	297,818		—			—			297,818
	Short-term investments:
	Certificates of deposit	960		—			—			960
	Commercial paper	12,738		—			—			12,738
	Corporate notes and bonds	175,446		220			(220		)	175,446
	Federal agency notes and bonds	64,863		31			(69		)	64,825
	Time deposits	21,585		—			—			21,585
	Municipal notes and bonds	103,923		153			(14		)	104,062
	Total short-term investments	379,515		404			(303		)	379,616
	Total cash, cash equivalents, and short-term investments	$	677,333	$	404		$	(303	)	$	677,434
Available-for-sale Securities, Continuous Unrealized Loss Position	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 December 31, 2014 (in thousands):
		Less Than 12 months
				Gross
		Fair Value		Unrealized
				Losses
	Corporate notes and bonds	$	105,704	$	(259	)
	Federal agency notes and bonds	34,434		(44		)
	Municipal notes and bonds	13,120		(18		)
	Total	$	153,258	$	(321	)
	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 December 31, 2014 (in thousands):
		Greater Than 12 months
				Gross
		Fair Value		Unrealized
				Losses
	Corporate notes and bonds	$	7,598	$	(112	)
	Total	$	7,598	$	(112	)
Investments Classified by Contractual Maturity Date	The following table summarizes the cost and estimated fair value of the Company’s short-term investments by contractual maturity at December 31, 2014 (in thousands):
		Cost		Fair Value
	Due within one year	$	190,404	$	190,484
	Due in one year to two years	112,364		112,237
	Due after two years	50,570		50,409
	Total	$	353,338	$	353,130

Property_and_Equipment_Tables

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	The following table summarizes the cost of property and equipment and related accumulated depreciation at December 31, 2014 and 2013 (in thousands):
		Estimated	December 31,
		Useful Lives	2014			2013
	Land	N/A	$	20,637		$	20,637
	Buildings	25 years	105,725			105,725
	Site improvements	15 years	1,247			1,199
	Building improvements	10-15 years	11,434			11,246
	Total land and buildings		139,043			138,807
	Computer and equipment	1-5 years	67,819			62,423
	Furniture and fixtures	3-5 years	10,206			8,287
	Leasehold improvements	1-10 years	23,802			14,454
	Total property and equipment		240,870			223,971
	Less: Accumulated depreciation and amortization		(81,162		)	(66,663		)
	Total property and equipment, net		$	159,708		$	157,308

Intangible_Assets_and_Goodwill1

Intangible Assets and Goodwill (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets	The carrying amounts of the intangible assets other than goodwill as of December 31, 2014 and 2013 are as follows (in thousands, except years):
		December 31, 2014								December 31, 2013							Weighted
																	Average
																	Useful Life
		Cost			Accumulated			Net		Cost		Accumulated			Net		(Years)
					Amortization							Amortization
	Developed and core technology	$	145,929		$	(112,169	)	$	33,760	$	130,744	$	(99,026	)	$	31,718	6
	Other intangible assets:
	Customer relationships	45,178			(39,766		)	5,412		41,683		(35,216		)	6,467		5
	All other (i)	19,145			(15,156		)	3,989		17,205		(13,765		)	3,440		9-Apr
	Total other intangible assets	64,323			(54,922		)	9,401		58,888		(48,981		)	9,907
	Total intangible assets, net	$	210,252		$	(167,091	)	$	43,161	$	189,632	$	(148,007	)	$	41,625
	____________________
	(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 December 31, 2014, 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			Assets
	2015	$	10,382		$	4,302		$	14,684
	2016	8,899			2,449			11,348
	2017	6,881			1,152			8,033
	2018	4,762			729			5,491
	2019	2,335			449			2,784
	Thereafter	501			320			821
	Total expected amortization expense	$	33,760		$	9,401		$	43,161
Schedule of Goodwill	The changes in the carrying amount of goodwill for the years ended December 31, 2014 and 2013 are as follows (in thousands):
		December 31,
		2014			2013
	Beginning balance	$	523,142		$	510,121
	Goodwill from acquisitions	38,776			7,110
	Subsequent goodwill adjustments	(10,722		)	5,911
	Ending balance	$	551,196		$	523,142

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
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:
		Years Ended December 31,
		2014				2013				2012
	Option grants:
	Expected volatility	35 - 40		%		41 - 43		%		39 - 48		%
	Weighted-average volatility	39		%		41		%		44		%
	Expected dividends	—				—				—
	Expected term of options (in years)	3.5				3.3				3.3
	Risk-free interest rate	1.1		%		0.7		%		0.5		%
	ESPP:
	Expected volatility	30 - 36		%		37 - 42		%		43 - 53		%
	Weighted-average volatility	32		%		40		%		49		%
	Expected dividends	—				—				—
	Expected term of ESPP (in years)	0.5				0.5				0.5
	Risk-free interest rate	0.1		%		0.1		%		0.1		%
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs	The allocation of the stock-based compensation, net of estimated income tax benefit, is as follows (in thousands):
		Years Ended December 31,
		2014				2013				2012
	Cost of service revenues	$	5,935			$	5,525			$	4,349
	Research and development	20,255				19,002				14,919
	Sales and marketing	19,062				19,323				13,518
	General and administrative	14,110				13,354				10,017
	Total stock-based compensation	59,362				57,204				42,803
	Estimated tax benefit of stock-based compensation	(16,632		)		(15,934		)		(10,994		)
	Total stock-based compensation, net of estimated tax benefit	$	42,730			$	41,270			$	31,809
Schedule of Share-based Compensation, Stock Options, Activity	A summary of stock option activity through December 31, 2014 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, 2011	10,229			$	19.37			3.5		$	218,839
	Granted	2,844			38.81
	Exercised	(1,884	)		13.4
	Forfeited or expired	(495	)		36.72
	Outstanding at December 31, 2012	10,694			$	24.79			3.5		$	104,404
	Granted	2,267			37.34
	Exercised	(2,671	)		15.24
	Forfeited or expired	(866	)		40.67
	Outstanding at December 31, 2013	9,424			$	29.05			3.48		$	127,697
	Granted	1,738			37.05
	Exercised	(2,942	)		13.23
	Forfeited or expired	(1,034	)		40.45
	Outstanding at December 31, 2014	7,186			$	35.82			4.25		$	31,514
	Exercisable at December 31, 2014	4,215			$	34.84			3.41		$	26,168
Schedule of Share-based Compensation, Restricted Stock Units Award Activity	The Company started granting RSUs in 2009. A summary of RSU activity through December 31, 2014 is presented below (in thousands, except per share amounts):
					Weighted-
					Average
		Number of			Grant Date
		Shares			Fair Value
	Outstanding at December 31, 2011	1,611
	Awarded	1,095			$	40.13
	Released	(535	)		$	30.55
	Forfeited	-244			$	39.3
	Outstanding at December 31, 2012	1,927
	Awarded	835			$	35.5
	Released	-711			$	33.31
	Forfeited	-258			$	39.91
	Outstanding at December 31, 2013	1,793
	Awarded	1,671			$	35.88
	Released	-616			$	38.29
	Forfeited	-335			$	37.56
	Outstanding at December 31, 2014	2,513
Schedule of Performance-based Units Activity	A summary of PRSU activity granted in 2013, certified and actually achieved through December 31, 2014 is presented below (in thousands):
		Number of
		Shares
	Outstanding at December 31, 2013	—
	Achieved	507
	Released	(127	)
	Forfeited	(74	)
	Outstanding at December 31, 2014	306
	The fair value of PRSUs released during the year ended December 31, 2014 was approximately $4.9 million.
	As of December 31, 2014, the PSRUs granted in 2014 had not been certified by the Compensation Committee of the Board of Directors as achieved. A summary of PRSU activity through December 31, 2014 is presented below (in thousands):
		Number of
		Shares
	Outstanding at December 31, 2013	—
	Granted	223
	Forfeited	(12	)
	Outstanding at December 31, 2014	211

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2014
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 year ended December 31, 2014, 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 income (loss) as of December 31, 2013		$	(2,879	)	$	63			$	(396	)		$	(3,212	)
	Other comprehensive income (loss):
	Other comprehensive income (loss) before reclassifications, net of tax benefit (expense) of $664, $111 and $(483)		(28,433		)	(181		)		787				(27,827		)
	Net gain from discontinuance of cash flow hedges, net of tax expense of $-, $- and $(3)		—			—				6				6
	Net gain reclassified from accumulated other comprehensive income (loss), net of tax expense of $ —, $(7) and $(453)		—			(11		)	(i)	(739		)	(ii)	(750		)
	Net gain reclassified into earnings related to discontinuance of cash flow hedges, net of tax expense of $-, $- and $(3)		—			—				(6		)	(iii)	(6		)
	Total other comprehensive income (loss), net of tax effect (iv)		(28,433		)	(192		)		48				(28,577		)
	Accumulated other comprehensive loss as of December 31, 2014		$	(31,312	)	$	(129	)		$	(348	)		$	(31,789	)
	____________________
	(i)	The before-tax gain of $18 was included in other expense, net on the consolidated statements of income.
	(ii)	The before-tax gain of $287 and $905 were included in cost of service revenues and operating expenses, primarily research and development expense, respectively on the consolidated statements of income.
	(iii)	The before-tax gain of $2 and $7 were included in cost of service revenues and operating expenses, primarily research and development expense, respectively on the consolidated statements of income.
	(iv)	The tax expense related to the net gain reclassified from accumulated other comprehensive income (loss) was included in income tax provision on the consolidated statements of income.
	The following table summarizes the changes in accumulated balances for each component of other comprehensive income (loss), for the year ended December 31, 2013, 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, 2012		$	(8,012	)	$	242			$	(260	)		$	(8,030	)
	Other comprehensive income (loss):
	Other comprehensive income (loss) before reclassifications, net of tax benefit (expense) of $(172), $126 and $794		5,133			(205		)		(1,295		)		3,633
	Net loss reclassified from accumulated other comprehensive income (loss), net of tax benefit of $ —, $16 and $710		—			26			(i)	1,159			(ii)	1,185
	Total other comprehensive income (loss), net of tax effect (iii)		5,133			(179		)		(136		)		4,818
	Accumulated other comprehensive income (loss) as of December 31, 2013		$	(2,879	)	$	63			$	(396	)		$	(3,212	)
	____________________
	(i)	The before-tax loss of $42 was included in other expense, net on the consolidated statements of income.
	(ii)	The before-tax loss of $441 and $1,428 were included in cost of service revenues and operating expenses, primarily research and development expense, respectively on the 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 consolidated statements of income.

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2014
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 December 31, 2014 and 2013 (in thousands):
		December 31, 2014						December 31, 2013
		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	$	141		$	761		$	284		$	830
	Derivatives not designated as hedging instruments	169			154			—			194
	Total fair value of derivative instruments	$	310		$	915		$	284		$	1,024
	____________________
	(i)	Included in prepaid expenses and other current assets on the consolidated balance sheets.
	(ii)	Included in accrued liabilities and other liabilities on the consolidated balance sheets.
	(iii)	Included in accrued liabilities on the consolidated balance sheets.
Offsetting Assets	The following table sets forth the offsetting of derivative asset as of December 31, 2014 and 2013 (in thousands):
											Gross Amounts Not Offset
											in the Consolidated
											Balance Sheets
		Gross Amounts of			Gross Amounts Offset			Net Amounts of Assets			Financial			Cash		Net
		Recognized Assets			in the Consolidated			Presented			Instruments (i)			Collateral		Amount
					Balance Sheets			in the Consolidated
								Balance Sheets
	As of December 31,
	2014:00:00
	Foreign exchange contracts	$	310		$	—		$	310		$	(62	)	$	—	$	248
	As of December 31,
	2013:00:00
	Foreign exchange contracts	$	284		$	—		$	284		$	(268	)	$	—	$	16
	____________________
	(i)	The balances at December 31, 2014 and 2013 were related to derivative liabilities which are allowed to 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 December 31, 2014 and 2013 (in thousands):
											Gross Amounts Not Offset
											in the Consolidated
											Balance Sheets
		Gross Amounts of			Gross Amounts Offset			Net Amounts of Liabilities			Financial					Net
		Recognized Liabilities			in the Consolidated			Presented			Instruments (ii)			Cash		Amount
					Balance Sheets			in the Consolidated						Collateral
								Balance Sheets
	As of December 31,
	2014:00:00
	Foreign exchange contracts	$	915		$	—		$	915		$	(62	)	$	—	$	853
	As of December 31,
	2013:00:00
	Foreign exchange contracts	$	1,024		$	—		$	1,024		$	(268	)	$	—	$	756
	____________________
	(ii)	The balances at December 31, 2014 and 2013 were related to derivative assets which are allowed to 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 consolidated statements of income for the years ended December 31, 2014, 2013, and 2012 are as follows (in thousands):
		Years Ended December 31,
		2014			2013			2012
	Amount of gain (loss) recognized in other comprehensive income (effective portion)	$	1,270		$	(2,089	)	$	(594	)
	Amount of gain (loss) reclassified from accumulated other comprehensive income to cost of service revenues and operating expenses (effective portion)	$	1,192		$	(1,869	)	$	(2,275	)
	Amount of gain recognized in income on derivatives for the amount excluded from effectiveness testing located in operating expenses	$	—		$	728		$	1,227
	Amount of loss on derivatives due to hedge ineffectiveness recognized in cost of service revenues and operating expenses	$	135		$	—		$	—
	The before-tax loss recognized in other expense, net for non-designated foreign currency forward contracts for the years ended December 31, 2014, 2013, and 2012 is as follows (in thousands):
		Years Ended December 31,
		2014			2013			2012
	Loss recognized in interest and other expense, net	$	(152	)	$	(161	)	$	(904	)

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	The federal, state, and foreign income tax provisions for the years ended December 31, 2014, 2013, and 2012 are summarized as follows (in thousands):
		Years Ended December 31,
		2014			2013			2012
	Current tax provision:
	Federal	$	39,903		$	65,344		$	35,481
	State	7,982			10,167			4,337
	Foreign	9,704			2,882			9,417
	Total current tax provision	57,589			78,393			49,235
	Deferred tax provision:
	Federal	(859		)	(24,469		)	(3,044		)
	State	1,686			(3,334		)	597
	Foreign	(2,210		)	3,737			(2,203		)
	Total deferred tax provision	(1,383		)	(24,066		)	(4,650		)
	Total provision for income taxes	$	56,206		$	54,327		$	44,585
Schedule of Income before Income Tax, Domestic and Foreign	The components of income before income taxes attributable to domestic and foreign operations are as follows (in thousands):
		Years Ended December 31,
		2014			2013			2012
	Domestic	$	128,857		$	118,939		$	87,981
	Foreign	41,436			21,783			49,786
	Income before income taxes	$	170,293		$	140,722		$	137,767
Schedule of Effective Income Tax Rate Reconciliation	A reconciliation of the provision computed at the statutory federal income tax rate to the Company's income tax provision is as follows (in thousands):
		Years Ended December 31,
		2014			2013			2012
	Income tax provision computed at federal statutory tax rate	$	59,603		$	49,253		$	48,218
	State taxes, net of federal benefit	5,970			4,208			3,276
	Foreign earnings taxed at different rates	(4,292		)	5,395			(9,557		)
	Stock-based compensation	4,475			3,397			3,270
	Return to provision true-up	(2,238		)	(668		)	92
	Research and development tax credits	(2,707		)	(3,715		)	—
	Domestic manufacturing deduction	(4,025		)	(3,150		)	(2,100		)
	Other	(580		)	(393		)	1,386
	Total provision for income taxes	$	56,206		$	54,327		$	44,585
Schedule of Deferred Tax Assets and Liabilities	Significant components of the Company's deferred tax assets are as follows (in thousands):
		December 31,
		2014			2013
	Deferred tax assets:
	Net operating loss carryforwards	$	28,168		$	23,710
	Tax credits carryforwards	9,883			10,131
	Deferred revenue	18,198			19,240
	Reserves and accrued costs not currently deductible	15,984			15,097
	Depreciable assets	7,767			6,450
	Stock-based compensation	23,814			20,149
	Other	2,100			381
	Valuation allowance	(8,298		)	(4,552		)
	Total deferred tax assets	97,616			90,606
	Deferred tax liabilities:
	Non-deductible intangible assets (i)	(18,717		)	(12,887		)
	Total deferred tax liabilities	(18,717		)	(12,887		)
	Net deferred tax assets	$	78,899		$	77,719
Summary of Income Tax Contingencies	A reconciliation of the beginning and ending amount of the unrecognized tax benefits is as follows (in thousands):
		December 31,
		2014			2013			2012
	Beginning balance	$	29,174		$	21,079		$	16,298
	Additions for tax positions of prior years	2,283			672			2,407
	Reductions for tax positions of prior years	(636		)	(668		)	(475		)
	Additions based on tax positions related to the current year	5,429			9,671			4,335
	Reductions due to lapse of statute of limitations	(2,893		)	(1,580		)	(1,486		)
	Reductions due to settlements	(162		)	—			—
	Ending balance	$	33,195		$	29,174		$	21,079

Net_Income_per_Common_Share_Ta

Net Income per Common Share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Schedule of Calculation of Numerator and Denominator in Earnings Per Share	The calculation of basic and diluted net income per share is as follows (in thousands, except per share amounts):
		Years Ended December 31,
		2014		2013		2012
	Net income	$	114,087	$	86,395	$	93,182
	Weighted-average shares of common stock used to compute basic net income per share	109,199		108,146		107,874
	Effect of dilutive common stock equivalents:
	Dilutive effect of employee stock options	1,004		2,925		3,863
	Dilutive effect of unvested restricted stock units	757		323		352
	Weighted-average shares of common stock used to compute diluted net income per share	110,960		111,394		112,089
	Net income per share-basic	$	1.04	$	0.8	$	0.86
	Net income per share-diluted	$	1.03	$	0.78	$	0.83
	Weighted average stock options and restricted stock units excluded from calculation due to anti-dilutive effect	5,166		5,666		3,844

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	Future minimum lease payments as of December 31, 2014 under non-cancelable operating leases with original terms in excess of one year are summarized as follows (in thousands):
		Operating
		Leases
	2015	$	11,709
	2016	9,733
	2017	8,326
	2018	7,697
	2019	6,169
	Thereafter	8,363
	Total future minimum operating lease payments	$	51,997

Significant_Customer_Informati1

Significant Customer Information and Segment Information (Tables)	12 Months Ended
	Dec. 31, 2014
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):
		Years Ended December 31,
		2014		2013		2012
	Revenues:
	North America	$	688,186	$	642,707	$	524,191
	Europe, the Middle East, and Africa	241,785		211,504		202,861
	Other	117,983		93,960		84,519
	Total revenues	$	1,047,954	$	948,171	$	811,571
	Property and equipment, net by geographic region is summarized as follows (in thousands):
		December 31,
		2014		2013
	Property and equipment, net:
	North America	$	143,482	$	147,460
	Europe, the Middle East, and Africa	10,902		4,907
	Other	5,324		4,941
	Total property and equipment, net	$	159,708	$	157,308
	The Company derives revenues from sales of software licenses, subscription-based licenses for a variety of cloud and data-as-a-service offerings, maintenance and support services, and professional services, consisting of consulting and education services. It is impracticable to disaggregate software license and subscription revenues by product. The Company's disaggregated revenue information is as follows (in thousands):
		Years Ended December 31,
		2014		2013		2012
	Software revenues:
	License	$	387,660	$	367,074	$	320,982
	Subscription	69,704		46,664		29,193
	Total software revenues	457,364		413,738		350,175
	Service revenues:
	Maintenance	456,718		409,325		360,769
	Consulting and education	133,872		125,108		100,627
	Total service revenues	590,590		534,433		461,396
	Total revenues	$	1,047,954	$	948,171	$	811,571

Selected_Quarterly_Financial_I1

Selected Quarterly Financial Information (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information	Note

Acquisitions_Tables

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2014
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
Heiler Software AG [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 at the acquisition date (in thousands):
	Net tangible assets	$	16,400
	Identifiable intangible assets:
	Developed and core technology	16,586
	Customer relationships	5,339
	Contract backlog	648
	Trade names	298
	In-process research and development	3,784
	Noncontrolling interest	(2,861		)
	Total identifiable net assets	40,194
	Goodwill	61,660
	Total cash consideration	$	101,854

Summary_of_Significant_Account3

Summary of Significant Accounting Policies (Significant Accounting Policies) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	reporting_segment	reporting_segment	reporting_segment
Summary of Significant Accounting Policies [Line Items]
Maintenance Revenue Contract, Term	1 year
Allowance for Doubtful Accounts Receivable, Current	$3,465,000	$4,135,000
Reporting Segment Number	1	1	1
Other than temporary impairment losses, investments	0	0	0
Goodwill and intangible asset impairment	0	0	0
Tangible asset impairment	0	0	0
Building [Member]
Summary of Significant Accounting Policies [Line Items]
Property and equipment, useful life	25 years
Building Improvements [Member] | Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Property and equipment, useful life	10 years
Building Improvements [Member] | Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Property and equipment, useful life	15 years
Site Improvements [Member]
Summary of Significant Accounting Policies [Line Items]
Property and equipment, useful life	15 years
Leasehold Improvements [Member] | Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Property and equipment, useful life	1 year
Leasehold Improvements [Member] | Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Property and equipment, useful life	10 years
Property, Plant and Equipment, Various Types [Member] | Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Property and equipment, useful life	1 year
Property, Plant and Equipment, Various Types [Member] | Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Property and equipment, useful life	5 years
Software and Software Development Costs [Member]
Summary of Significant Accounting Policies [Line Items]
Amount capitalized for internal use software	1,200,000
Sales of Investments [Member]
Summary of Significant Accounting Policies [Line Items]
Prior Period Reclassification Adjustment, Reclass Out Of		-61,000,000	-110,000,000
Maturities of Investments [Member]
Summary of Significant Accounting Policies [Line Items]
Prior Period Reclassification Adjustment, Reclass Into		61,000,000	110,000,000
Accounts Payable [Member]
Summary of Significant Accounting Policies [Line Items]
Prior Period Reclassification Adjustment, Reclass Out Of		-900,000
Accrued Liabilities [Member]
Summary of Significant Accounting Policies [Line Items]
Prior Period Reclassification Adjustment, Reclass Into		900,000
Prior Period Reclassification Adjustment, Reclass Out Of		-9,200,000
Accrued Compensation and Related Expenses [Member]
Summary of Significant Accounting Policies [Line Items]
Prior Period Reclassification Adjustment, Reclass Into		$9,200,000

Summary_of_Significant_Account4

Summary of Significant Accounting Policies (Financial Assets and Liabilities at Fair Value) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Fair Value, Assets and Liabilities, Recurring Basis [Abstract]
Cash and Cash Equivalents, Estimated Fair Value	$368,531,000		$297,818,000
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, Recurring Basis [Abstract]
Total Cash Equivalents and Short-term Investments	41,739,000		43,478,000
Foreign currency derivatives	0	[1]	0	[1]
Assets, Fair Value Disclosure, Recurring	41,739,000		43,478,000
Foreign currency derivatives	0	[2]	0	[3]
Acquisition-related contingent consideration			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, Recurring Basis [Abstract]
Total Cash Equivalents and Short-term Investments	326,735,000		370,384,000
Foreign currency derivatives	310,000	[1]	284,000	[1]
Assets, Fair Value Disclosure, Recurring	327,045,000		370,668,000
Foreign currency derivatives	915,000	[2]	1,024,000	[3]
Acquisition-related contingent consideration			0	[3]
Liabilities, Fair Value Disclosure, Recurring	915,000		1,024,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities, Recurring Basis [Abstract]
Total Cash Equivalents and Short-term Investments	0		0
Foreign currency derivatives	0	[1]	0	[1]
Assets, Fair Value Disclosure, Recurring	0		0
Foreign currency derivatives	0	[2]	0	[3]
Acquisition-related contingent consideration	0	[3]	3,071,000	[3]
Liabilities, Fair Value Disclosure, Recurring	0		3,071,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities, Recurring Basis [Abstract]
Total Cash Equivalents and Short-term Investments	368,474,000		413,862,000
Foreign currency derivatives	310,000	[1]	284,000	[1]
Assets, Fair Value Disclosure, Recurring	368,784,000		414,146,000
Foreign currency derivatives	915,000	[2]	1,024,000	[3]
Acquisition-related contingent consideration			3,071,000	[3]
Liabilities, Fair Value Disclosure, Recurring	915,000		4,095,000
Time Deposits [Member]
Fair Value, Assets and Liabilities, Recurring Basis [Abstract]
Other Short-Term Investments, Estimated Fair Value	26,395,000		21,585,000
Time Deposits [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities, Recurring Basis [Abstract]
Other Short-Term Investments, Estimated Fair Value	26,395,000	[4]	21,585,000	[4]
Time Deposits [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities, Recurring Basis [Abstract]
Other Short-Term Investments, Estimated Fair Value	0	[4]	0	[4]
Time Deposits [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities, Recurring Basis [Abstract]
Other Short-Term Investments, Estimated Fair Value	0	[4]	0	[4]
Time Deposits [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities, Recurring Basis [Abstract]
Other Short-Term Investments, Estimated Fair Value	26,395,000	[4]	21,585,000	[4]
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities, Recurring Basis [Abstract]
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, Recurring Basis [Abstract]
Marketable Debt Securities, Fair Value Disclosure	326,735,000	[4]	370,384,000	[4]
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities, Recurring Basis [Abstract]
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, Recurring Basis [Abstract]
Marketable Debt Securities, Fair Value Disclosure	326,735,000	[4]	370,384,000	[4]
Money Market Funds [Member]
Fair Value, Assets and Liabilities, Recurring Basis [Abstract]
Cash and Cash Equivalents, Estimated Fair Value	15,344,000		21,893,000
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities, Recurring Basis [Abstract]
Cash and Cash Equivalents, Estimated Fair Value	15,344,000	[5]	21,893,000	[5]
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities, Recurring Basis [Abstract]
Cash and Cash Equivalents, Estimated Fair Value	0	[5]	0	[5]
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities, Recurring Basis [Abstract]
Cash and Cash Equivalents, Estimated Fair Value	0	[5]	0	[5]
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities, Recurring Basis [Abstract]
Cash and Cash Equivalents, Estimated Fair Value	$15,344,000	[5]	$21,893,000	[5]
[1]	Included in prepaid expenses and other current assets on the consolidated balance sheets.
[2]	Included in accrued and other liabilities on the consolidated balance sheets.
[3]	Included in accrued liabilities on the consolidated balance sheets.
[4]	Included in either cash and cash equivalents or short-term investments on the consolidated balance sheets.
[5]	Included in cash and cash equivalents on the consolidated balance sheets.

Summary_of_Significant_Account5

Summary of Significant Accounting Policies (Foreign Currency Derivatives and Hedging Instruments) (Details) (Foreign Exchange Forward [Member], Cash Flow Hedging [Member])	12 Months Ended
	Dec. 31, 2014
Foreign Exchange Forward [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Maximum Remaining Maturity of Foreign Currency Derivatives	13 months

Summary_of_Significant_Account6

Summary of Significant Accounting Policies (Change in Acquisition-Related Contingent Consideration Liability) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Business Acquisition, Contingent Consideration [Line Items]
Payment of contingent consideration	($3,061)		($4,170)	($8,050)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Business Acquisition, Contingent Consideration [Line Items]
Beginning balance as of December 31, 2013	3,071	[1]
Change in fair value of contingent consideration	-10
Payment of contingent consideration	-3,061
Ending balance as of December 31, 2014	$0	[1]
[1]	Included in accrued liabilities on the consolidated balance sheets.

Summary_of_Significant_Account7

Summary of Significant Accounting Policies (Cost Method Investments) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Cost Method Investments	$2,300,000	$4,100,000
Payments to Acquire Long-term Investments	300,000
Cost-method Investments, Realized Losses	$1,998,000	$0	$0

Cash_Cash_Equivalents_and_Shor2

Cash, Cash Equivalents, and Short-Term Investments (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents, at cost	$368,531	$297,818	$190,127	$316,835
Short-Term Investments Total Amortized Cost	353,338	379,515
Total Cash, Cash Equivalents, and Short-Term Investments Cost Basis	721,869	677,333
Available-for-sale Securities, Gross Unrealized Gains	225	404
Available-for-sale Securities, Gross Unrealized Losses	-433	-303
Cash and Cash Equivalents, Estimated Fair Value	368,531	297,818
Total Short-term Investments, Fair Value Disclosure	353,130	379,616
Total Cash, Cash Equivalents, and Short-term Investments, Estimated Fair Value	721,661	677,434
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	153,258
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Accumulated in Investments	-321
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	7,598
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	-112
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	74,639	103,923
Available-for-sale Securities, Gross Unrealized Gains	128	153
Available-for-sale Securities, Gross Unrealized Losses	-18	-14
Available-for-sale Securities, Estimated Fair Value	74,749	104,062
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	13,120
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Accumulated in Investments	-18
Time Deposits, Not Included with Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Other Short-Term Investments, Cost Basis	26,395	21,585
Other Short-Term Investments, Estimated Fair Value	26,395	21,585
US Government Agencies Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	51,987	64,863
Available-for-sale Securities, Gross Unrealized Gains	13	31
Available-for-sale Securities, Gross Unrealized Losses	-44	-69
Available-for-sale Securities, Estimated Fair Value	51,956	64,825
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	34,434
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Accumulated in Investments	-44
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	196,401	175,446
Available-for-sale Securities, Gross Unrealized Gains	84	220
Available-for-sale Securities, Gross Unrealized Losses	-371	-220
Available-for-sale Securities, Estimated Fair Value	196,114	175,446
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	105,704
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Accumulated in Investments	-259
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	7,598
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	-112
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	1,996	12,738
Available-for-sale Securities, Gross Unrealized Gains	0	0
Available-for-sale Securities, Gross Unrealized Losses	0	0
Available-for-sale Securities, Estimated Fair Value	1,996	12,738
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,920	960
Available-for-sale Securities, Gross Unrealized Gains	0	0
Available-for-sale Securities, Gross Unrealized Losses	0	0
Available-for-sale Securities, Estimated Fair Value	1,920	960
Cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents, at cost	353,187	263,572
Cash and Cash Equivalents, Estimated Fair Value	353,187	263,572
Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents, at cost	15,344	34,246
Cash and Cash Equivalents, Estimated Fair Value	15,344	34,246
Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents, at cost	15,344	21,893
Cash and Cash Equivalents, Estimated Fair Value	15,344	21,893
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents, at cost	0	12,353
Cash and Cash Equivalents, Estimated Fair Value	$0	$12,353

Cash_Cash_Equivalents_and_Shor3

Cash, Cash Equivalents, and Short-Term Investments (Short-Term Investments Maturities) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Short-Term Investments, Maturities, Due within One Year, Cost Basis	$190,404
Available-For-Sale Securities, Debt Maturities, Due in One to Two Years, Amortized Cost Basis	112,364
Available-For-Sale Securities, Debt Maturities, Due after Two Years, Amortized Cost Basis	50,570
Short-Term Investments Total Amortized Cost	353,338	379,515
Short-Term Investments, Maturities, Due within One Year, Fair Value	190,484
Available-For-Sale Securities, Debt Maturities, Due in One to Two Years, Fair Value	112,237
Available-For-Sale Securities, Debt Maturities, Due after Two Years, Fair Value	50,409
Total Short-term Investments, Fair Value Disclosure	$353,130	$379,616

Property_and_Equipment_Details

Property and Equipment (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Total property and equipment	$240,870	$223,971
Less: Accumulated depreciation and amortization	-81,162	-66,663
Total property and equipment, net	159,708	157,308
Depreciation and amortization	19,107	14,978	12,284
Land and Building [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	139,043	138,807
Land [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	20,637	20,637
Building [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	105,725	105,725
Property and equipment, useful life	25 years
Site Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	1,247	1,199
Property and equipment, useful life	15 years
Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	11,434	11,246
Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	10 years
Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	15 years
Computer Equipment, Software and Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	67,819	62,423
Computer Equipment, Software and Office Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	1 year
Computer Equipment, Software and Office Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	10,206	8,287
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$23,802	$14,454
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	1 year
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	10 years

Intangible_Assets_and_Goodwill2

Intangible Assets and Goodwill (Intangible Assets) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross	$210,252		$189,632
Finite-Lived Intangible Assets, Accumulated Amortization	-167,091		-148,007
Finite-Lived Intangible Assets, Net	43,161		41,625
Amortization of intangible assets and acquired technology	19,084		30,036		28,558
Cost of Services, Amortization	13,141		22,307		21,980
Amortization of intangible assets	5,943		7,729		6,578
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2015	14,684
2016	11,348
2017	8,033
2018	5,491
2019	2,784
Thereafter	821
Finite-Lived Intangible Assets, Net	43,161		41,625
Developed Technology Rights [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross	145,929		130,744
Finite-Lived Intangible Assets, Accumulated Amortization	-112,169		-99,026
Finite-Lived Intangible Assets, Net	33,760		31,718
Finite-Lived Intangible Assets, Weighted-Average Useful Life (in years)	6 years
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2015	10,382
2016	8,899
2017	6,881
2018	4,762
2019	2,335
Thereafter	501
Finite-Lived Intangible Assets, Net	33,760		31,718
Other Finite Lived Intangible Assets [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross	64,323		58,888
Finite-Lived Intangible Assets, Accumulated Amortization	-54,922		-48,981
Finite-Lived Intangible Assets, Net	9,401		9,907
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2015	4,302
2016	2,449
2017	1,152
2018	729
2019	449
Thereafter	320
Finite-Lived Intangible Assets, Net	9,401		9,907
Customer Relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross	45,178		41,683
Finite-Lived Intangible Assets, Accumulated Amortization	-39,766		-35,216
Finite-Lived Intangible Assets, Net	5,412		6,467
Finite-Lived Intangible Assets, Weighted-Average Useful Life (in years)	5 years
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Finite-Lived Intangible Assets, Net	5,412		6,467
All Other [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross	19,145	[1]	17,205	[1]
Finite-Lived Intangible Assets, Accumulated Amortization	-15,156	[1]	-13,765	[1]
Finite-Lived Intangible Assets, Net	3,989	[1]	3,440	[1]
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Finite-Lived Intangible Assets, Net	$3,989	[1]	$3,440	[1]
All Other [Member] | Maximum [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Weighted-Average Useful Life (in years)	9 years
All Other [Member] | Minimum [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Weighted-Average Useful Life (in years)	4 years
[1]	All other includes vendor relationships, trade names, covenants not to compete, and patents.

Intangible_Assets_and_Goodwill3

Intangible Assets and Goodwill (Goodwill) (Details) (USD $)	12 Months Ended		3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Nov. 30, 2012
Goodwill [Roll Forward]
Beginning balance	$523,142,000	$510,121,000	$510,121,000
Goodwill from acquisitions	38,776,000	7,110,000
Subsequent goodwill adjustments	-10,722,000	5,911,000
Ending balance	551,196,000	523,142,000
Goodwill, Translation Adjustments		4,000,000
Goodwill, Subsequent Recognition of Deferred Tax Asset		-900,000
Heiler Software AG [Member]
Goodwill [Roll Forward]
Beginning balance				61,660,000
Ending balance				61,660,000
Goodwill, purchase accounting adjustments		$2,800,000	$2,800,000

Borrowings_Credit_Agreement_De

Borrowings (Credit Agreement) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
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	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, Unused Capacity, Commitment Fee Percentage	0.23%
Maximum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.35%
Base Rate [Member]
Line of Credit Facility [Line Items]
Line of Credit, Frequency of Interest Payment (in months)	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 (in months)	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

Stockholders_Equity_Class_of_S

Stockholders' Equity Class of Stock (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred Stock, Shares Issued	0	0
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common Stock, Shares Authorized	200,000,000	200,000,000
Common Stock, Par or Stated Value Per Share	$0.00	$0.00
Common Stock, Voting Rights	Each share of common stock has the right to one vote.
Common Stock, Dividends, Per Share, Declared	$0
Common Stock, Dividends, Per Share, Cash Paid	$0
Preferred Stock [Member]
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred Stock, Shares Authorized	2,000,000
Preferred Stock, Par or Stated Value Per Share	$0.00
Series A Preferred Stock [Member]
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred Stock, Shares Authorized	200,000

Stockholders_Equity_Stock_Repu

Stockholders' Equity Stock Repurchase Plan (Details) (USD $)	12 Months Ended
Share data in Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 31, 2014	Jul. 31, 2014	Jan. 31, 2014
Stockholders' Equity Note [Abstract]
Stock Repurchase Program, Authorized Amount	$300,000,000			$100,000,000	$100,000,000	$100,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	162,800,000
Stock Repurchased and Retired During Period, Shares	4,074	2,488	2,435
Stock Repurchased and Retired During Period, Value	$141,247,000	$92,068,000	$80,983,000

StockBased_Compensation_Summar

Stock-Based Compensation (Summary of Plans) (Details)	12 Months Ended	1 Months Ended
	Dec. 31, 2014	Apr. 30, 1999	31-May-14	31-May-13	31-May-12	31-May-11	Apr. 30, 2009	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	31-May-08
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options outstanding	7,186,000							9,424,000	10,694,000	10,229,000
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Instruments Other than Options, Nonvested, Number	517,000
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance											8,850,000
Number of Shares Available for Grant or Issuance	5,506,000
Minimum Employee Subscription Rate											1.00%
Maximum Employee Subscription Rate	10.00%										20.00%
Percentage of Market Price, Purchase Date	85.00%
Offering Period	6 months
1999 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance		2,600,000
Annual Increase of Number of Common Shares Reserved for Future Issuance by Lesser of Authorized Number of Shares or Percentage of Diluted Common Stock Outstanding, Maximum Shares		16,000,000
Annual Increase of Number of Common Shares Reserved for Future Issuance by Lesser of Authorized Number of Shares or Percentage of Diluted Common Stock Outstanding, Percentage of Diluted Common Stock		5.00%
Number of Shares Available for Grant or Issuance	0
Number of options outstanding	500,000
1999 Stock Incentive Plan [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period		4 years
1999 Stock Incentive Plan [Member] | Stock Options [Member] | Lower Limit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Award, Expiration Period		7 years
1999 Stock Incentive Plan [Member] | Stock Options [Member] | Upper Limit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Award, Expiration Period		10 years
1999 Stock Incentive Plan [Member] | Stock Options [Member] | New Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Requisite Service Period		1 year
1999 Stock Incentive Plan [Member] | Incentive Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum exercise price of options as a percentage of the fair value of common stock		100.00%
1999 Stock Incentive Plan [Member] | Non-qualified Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum exercise price of options as a percentage of the fair value of common stock		85.00%
2009 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance							9,000,000
Number of Shares Available for Grant or Issuance	7,121,000
Additional Number of Common Shares Reserved for Future Issuance			6,300,000	4,000,000	5,000,000	2,500,000
2009 Equity Incentive Plan [Member] | Stock Options [Member] | Director [Member] | Lower Limit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Award, Expiration Period	5 years
Award Vesting Period	1 year
2009 Equity Incentive Plan [Member] | Stock Options [Member] | Director [Member] | Upper Limit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Award, Expiration Period	7 years
Award Vesting Period	3 years
2009 Equity Incentive Plan [Member] | Stock Options [Member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	4 years
2009 Equity Incentive Plan [Member] | Stock Options [Member] | Employees [Member] | Lower Limit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Award, Expiration Period	7 years
2009 Equity Incentive Plan [Member] | Stock Options [Member] | Employees [Member] | Upper Limit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Award, Expiration Period	10 years
2009 Equity Incentive Plan [Member] | Stock Options [Member] | New Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Requisite Service Period	1 year
2009 Equity Incentive Plan [Member] | Incentive Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum exercise price of options as a percentage of the fair value of common stock							100.00%
2009 Equity Incentive Plan [Member] | Non-qualified Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum exercise price of options as a percentage of the fair value of common stock							85.00%
2009 Equity Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Instruments Other than Options, Nonvested, Number	2,489,000
2009 Equity Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] | Director [Member] | Lower Limit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	1 year
2009 Equity Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] | Director [Member] | Upper Limit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	3 years
2009 Equity Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	4 years
2009 Equity Incentive Plan [Member] | Stock Options, RSUs, and PRSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares or Units, Outstanding	10,216,000
2009 Equity Incentive Plan [Member] | Before Plan Amendment Date May 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion Ratios						1.52
2009 Equity Incentive Plan [Member] | Before Plan Amendment Date May 2011 [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Instruments Other than Options, Nonvested, Number	68,000
2009 Equity Incentive Plan [Member] | After Plan Amendment Date May 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion Ratios						2.37
2009 Equity Incentive Plan [Member] | After Plan Amendment Date May 2011 [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Instruments Other than Options, Nonvested, Number	2,421,000

StockBased_Compensation_Valuat

Stock-Based Compensation (Valuation Assumptions) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeiture Rate	10.00%	10.00%	10.00%
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility, minimum	35.00%	41.00%	39.00%
Expected volatility, maximum	40.00%	43.00%	48.00%
Weighted-average volatility	39.00%	41.00%	44.00%
Expected dividends	0.00%	0.00%	0.00%
Expected term	3 years 5 months 19 days	3 years 3 months 18 days	3 years 3 months 18 days
Risk-free interest rate	1.10%	0.70%	0.50%
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility, minimum	30.00%	37.00%	43.00%
Expected volatility, maximum	36.00%	42.00%	53.00%
Weighted-average volatility	32.00%	40.00%	49.00%
Expected dividends	0.00%	0.00%	0.00%
Expected term	6 months	6 months	6 months
Risk-free interest rate	0.10%	0.10%	0.10%

StockBased_Compensation_Alloca

Stock-Based Compensation (Allocation of Share-Based Compensation Expense) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$59,362,000	$57,204,000	$42,803,000
Estimated tax benefit of stock-based compensation	-16,632,000	-15,934,000	-10,994,000
Total stock-based compensation, net of tax benefit	42,730,000	41,270,000	31,809,000
Cost of service revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	5,935,000	5,525,000	4,349,000
Research and development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	20,255,000	19,002,000	14,919,000
Sales and marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	19,062,000	19,323,000	13,518,000
General and administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$14,110,000	$13,354,000	$10,017,000

StockBased_Compensation_Stock_

Stock-Based Compensation (Stock Option Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of stock option activity
Number of options outstanding at beginning of the year	9,424,000	10,694,000	10,229,000
Grants in period, gross	1,738,000	2,267,000	2,844,000
Exercises in Period	-2,942,000	-2,671,000	-1,884,000
Forfeitures and Expirations in Period	-1,034,000	-866,000	-495,000
Number of options outstanding at end of the year	7,186,000	9,424,000	10,694,000	10,229,000
Weighted average exercise price per share of outstanding options at beginning of the year	$29.05	$24.79	$19.37
Weighted average remaining contractual term of outstanding options (in years)	4 years 3 months	3 years 5 months 23 days	3 years 6 months	3 years 6 months
Aggregate intrinsic value of outstanding options	$31,514,000	$127,697,000	$104,404,000	$218,839,000
Options Grants in Period, Weighted Average Exercise Price	$37.05	$37.34	$38.81
Options Exercises in Period, Weighted Average Exercise Price	$13.23	$15.24	$13.40
Options Forfeitures and Expirations in Period, Weighted Average Exercise Price	$40.45	$40.67	$36.72
Weighted average exercise price per share of outstanding options at end of the year	$35.82	$29.05	$24.79	$19.37
Options Exercisable, Number	4,215,000
Options Exercisable, Weighted Average Exercise Price	$34.84
Options Exercisable, Weighted Average Remaining Contractual Term (in years)	3 years 4 months 28 days
Options, Exercisable, Aggregate Intrinsic Value	26,168,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options grants in period, exercise price less than grant date fair value	0	0	0
Stock Options, Additional Disclosures [Abstract]
Options, Vested, Grant date fair value	17,400,000	18,500,000	15,600,000
Nonvested options, number of shares outstanding	2,971,000
Nonvested awards, fair value	$33,400,000
Nonvested Options, Weighted Average Exercise Price	$37.22
Nonvested Options, Weighted Average Grant Date Fair Value	$11.25
Nonvested awards, weighted average period for recognition	2 years 6 months 4 days

StockBased_Compensation_Restri

Stock-Based Compensation (Restricted Stock Unit Activity) (Details) (Restricted Stock Units (RSUs) [Member], USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of restricted stock unit activity
Non-Option Equity Instruments, Outstanding Number at Beginning of the Year	1,793,000	1,927,000	1,611,000
Non-option grants in period	1,671,000	835,000	1,095,000
Released in Period	-616,000	-711,000	-535,000
Non-option forfeited in period	-335,000	-258,000	-244,000
Non-Option Equity Instruments, Outstanding Number at End of the Year	2,513,000	1,793,000	1,927,000
Equity Instruments Other than Options, Vested Deferred, Number	24,000
RSU nonvested, weighted average grant date fair value	$35.88	$35.50	$40.13
Released in period, weighted average grant date fair value	$38.29	$33.31	$30.55
RSU forfeited in period, weighted average grant date fair value	$37.56	$39.91	$39.30
Restricted Stock Unit, Additional Disclosures [Abstract]
Vested awards, fair value	$21.90	$25.40	$22.50
Nonvested awards, fair value	$91.90
Nonvested awards, weighted average period for recognition	2 years 8 months 5 days
2009 Equity Incentive Plan [Member]
Summary of restricted stock unit activity
Nonvested shares outstanding at end of the year	2,489,000

StockBased_Compensation_Perfor

Stock-Based Compensation (Performance Restricted Share Activity) (Details) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2014	Mar. 31, 2012	Mar. 31, 2015	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$59,362,000	$57,204,000	$42,803,000
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested awards, fair value	19,500,000
Nonvested shares outstanding at end of the year	517,000
Nonvested awards, weighted average period for recognition	1 year 2 months 12 days
Current Performance Period [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Instruments Other than Options, Shares Achieved in Period	0
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value				38.25
Nonvested shares outstanding at beginning of the year	0			0
Non-option forfeited in period	-12,000
Nonvested shares outstanding at end of the year	211,000
Released in Period	0
Equity Instruments Other than Options, Grants in Period, Target Number	223,000
Current Performance Period [Member] | Performance Shares [Member] | Award Recipients, Group 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%
Current Performance Period [Member] | Performance Shares [Member] | Award Recipients, Group Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum Percentage of Target Number of Shares Eligible to Receive				150.00%
Prior Performance Period One [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Instruments Other than Options, Shares Achieved in Period	507,000
Award Vesting Period	4 years
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value							$37.42
Nonvested shares outstanding at beginning of the year	0			0
Non-option forfeited in period	-74,000
Nonvested shares outstanding at end of the year	306,000	0
Released in Period	-127,000
Equity Instruments Other than Options, Grants in Period, Target Number		649,900
Vested awards, fair value	4,900,000
Prior Performance Period One [Member] | Performance Shares [Member] | Award Recipients, Group One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum Percentage of Target Number of Shares Eligible to Receive		110.00%
Prior Performance Period One [Member] | Performance Shares [Member] | Award Recipients, Group Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum Percentage of Target Number of Shares Eligible to Receive		125.00%
Prior Performance Period Two [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Instruments Other than Options, Shares Achieved in Period	0
Stock-based compensation					$0
Equity Instruments Other than Options, Grants in Period, Target Number			224,000
Prior Performance Period Two [Member] | Performance Shares [Member] | Award Recipients, Group Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum Percentage of Target Number of Shares Eligible to Receive			150.00%
Minimum [Member] | Current Performance Period [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period				2 years
Maximum [Member] | Current Performance Period [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period				4 years
Scenario, Forecast [Member] | Current Performance Period [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Instruments Other than Options, Shares Achieved in Period						138,000

StockBased_Compensation_Additi

Stock-Based Compensation (Additional Disclosures Pertaining to All Share-Based Compensation Plans) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from Issuance of Common Stock	$59,023,000	$58,669,000	$41,351,000
Tax benefits from stock-based compensation	373,000	26,082,000	16,463,000
Excess tax benefits from stock-based compensation	3,831,000	27,495,000	17,021,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options grants in period, weighted average grant date fair value	$11.02	$8.96	$12.06
Options grants in period, exercise price less than grant date fair value	0	0	0
Options exercises in period, total intrinsic value	70,500,000	58,400,000	53,500,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period, weighted average grant date fair value	$36.93	$38.50	$38.08
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period, weighted average grant date fair value	$37.76
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period, weighted average grant date fair value	$8.21	$10.01	$9.93
Total intrinsic value of shares purchased	$3,900,000	$6,500,000	$2,800,000

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), at beginning of period	($3,212,000)		($8,030,000)
Other comprehensive income (loss):
Other comprehensive income (loss), before reclassifications, net of tax	-27,827,000		3,633,000
Other comprehensive income (loss), gain from discontinuance of cash flow hedge before reclassifications, net of tax	6,000
Reclassification for net (gain) loss from accumulated other comprehensive income (loss), net of tax	-750,000		1,185,000
Reclassification for net gain from discontinuance of cash flow hedge from accumulated other comprehensive income (loss), net of tax	-6,000
Other comprehensive income (loss), net of tax	-28,577,000		4,818,000		4,772,000
Accumulated other comprehensive income (loss), at end of period	-31,789,000		-3,212,000		-8,030,000
Other Comprehensive Income (Loss), Tax [Abstract]
Tax benefit (expense) related to foreign currency translation adjustment	664,000		-172,000		-144,000
Cumulative translation reclassification adjustment, no tax effect	0		0
Tax benefit (expense) related to available-for-sale investments before reclassification adjustment	111,000		126,000		-244,000
Tax benefit (expense) of reclassification adjustment for sale of securities included in net income	-7,000		16,000		-19,000
Tax benefit (expense) related to unrealized gain (loss) on cash flow hedges arising during the period	-483,000		794,000		226,000
Tax expense related to net gain from discontinuance of cash flow hedges arising during the period	-3,000		0		0
Tax benefit (expense) of reclassification adjustment on cash flow hedges included in net income	-453,000		710,000		865,000
Tax expense related to reclassification adjustment on discontinuance of cash flow hedges	-3,000		0		0
Other-than-temporary gain or loss reflected in accumulated other comprehensive loss	0		0
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), at beginning of period	-2,879,000		-8,012,000
Other comprehensive income (loss):
Other comprehensive income (loss), before reclassifications, net of tax	-28,433,000		5,133,000
Reclassification for net (gain) loss from accumulated other comprehensive income (loss), net of tax	0		0
Other comprehensive income (loss), net of tax	-28,433,000		5,133,000
Accumulated other comprehensive income (loss), at end of period	-31,312,000		-2,879,000
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	63,000		242,000
Other comprehensive income (loss):
Other comprehensive income (loss), before reclassifications, net of tax	-181,000		-205,000
Reclassification for net (gain) loss from accumulated other comprehensive income (loss), net of tax	-11,000	[1]	26,000	[2]
Other comprehensive income (loss), net of tax	-192,000	[3]	-179,000	[4]
Accumulated other comprehensive income (loss), at end of period	-129,000		63,000
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	-396,000		-260,000
Other comprehensive income (loss):
Other comprehensive income (loss), before reclassifications, net of tax	787,000		-1,295,000
Reclassification for net (gain) loss from accumulated other comprehensive income (loss), net of tax	-739,000	[5]	1,159,000	[6]
Other comprehensive income (loss), net of tax	48,000	[3]	-136,000	[4]
Accumulated other comprehensive income (loss), at end of period	-348,000		-396,000
Other Comprehensive Income (Loss), Tax [Abstract]
Tax benefit (expense) related to unrealized gain (loss) on cash flow hedges arising during the period	-483,000		794,000
Tax benefit (expense) of reclassification adjustment on cash flow hedges included in net income	-453,000		710,000
Accumulated Net Gain (Loss) from Discontinuation of Cash Flow Hedges [Member]
Other comprehensive income (loss):
Other comprehensive income (loss), gain from discontinuance of cash flow hedge before reclassifications, net of tax	6,000
Reclassification for net gain from discontinuance of cash flow hedge from accumulated other comprehensive income (loss), net of tax	-6,000	[7]
Other Comprehensive Income (Loss), Tax [Abstract]
Tax expense related to net gain from discontinuance of cash flow hedges arising during the period	-3,000
Tax expense related to reclassification adjustment on discontinuance of cash flow hedges	($3,000)
[1]	The before-tax gain of $18 was included in other expense, net on the consolidated statements of income.
[2]	The before-tax loss of $42 was included in other expense, net on the 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 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 consolidated statements of income.
[5]	The before-tax gain of $287 and $905 were included in cost of service revenues and operating expenses, primarily research and development expense, respectively on the consolidated statements of income.
[6]	The before-tax loss of $441 and $1,428 were included in cost of service revenues and operating expenses, primarily research and development expense, respectively on the consolidated statements of income.
[7]	The before-tax gain of $2 and $7 were included in cost of service revenues and operating expenses, primarily research and development expense, respectively on the consolidated statements of income.

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Loss (Reclassification out of Accumulated Other Comprehensive Income (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense, net	$3,354		$1,165		$1,688
Cost of service revenues	171,657		149,136		122,798
Operating expenses	680,620		628,027		522,990
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 expense, net	-18	[1]	42	[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	-287	[3]	441	[4]
Operating expenses	-905	[3]	1,428	[4]
Accumulated Net Gain (Loss) from Discontinuation of 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	-2	[5]
Operating expenses	($7)	[5]
[1]	The before-tax gain of $18 was included in other expense, net on the consolidated statements of income.
[2]	The before-tax loss of $42 was included in other expense, net on the consolidated statements of income.
[3]	The before-tax gain of $287 and $905 were included in cost of service revenues and operating expenses, primarily research and development expense, respectively on the consolidated statements of income.
[4]	The before-tax loss of $441 and $1,428 were included in cost of service revenues and operating expenses, primarily research and development expense, respectively on the consolidated statements of income.
[5]	The before-tax gain of $2 and $7 were included in cost of service revenues and operating expenses, primarily research and development expense, respectively on the consolidated statements of income.

Derivative_Financial_Instrumen2

Derivative Financial Instruments (Fair Value) (Details) (Foreign Exchange Forward [Member], USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	310,000	[1]	$284,000	[1]
Derivative Liability, Fair Value, Gross Liability	915,000	[2]	1,024,000	[3]
Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Maximum Remaining Maturity of Foreign Currency Derivatives	13 months
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	141,000	[1]	284,000	[1]
Derivative Liability, Fair Value, Gross Liability	761,000	[2]	830,000	[3]
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	169,000	[1]	0	[1]
Derivative Liability, Fair Value, Gross Liability	154,000	[2]	194,000	[3]
Long [Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Foreign Currency Derivative Contracts	45,900,000		30,100,000
Long [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Foreign Currency Derivative Contracts	10,600,000		2,600,000
Short [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Foreign Currency Derivative Contracts	57,100,000		$0
[1]	Included in prepaid expenses and other current assets on the consolidated balance sheets.
[2]	Included in accrued liabilities and other liabilities on the consolidated balance sheets.
[3]	Included in accrued liabilities on the consolidated balance sheets.

Derivative_Financial_Instrumen3

Derivative Financial Instruments (Offsetting of Derivative Assets) (Details) (Foreign Exchange Forward [Member], USD $)	Dec. 31, 2014		Dec. 31, 2013
Foreign Exchange Forward [Member]
Offsetting Assets [Line Items]
Derivative Asset, Fair Value, Gross Asset	$310,000	[1]	$284,000	[1]
Derivative Asset, Fair Value, Gross Liability	0		0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	310,000		284,000
Derivative, Collateral, Obligation to Return Securities	-62,000	[2]	-268,000	[2]
Derivative, Collateral, Obligation to Return Cash	0		0
Derivative Asset, Fair Value, Amount Offset Against Collateral	$248,000		$16,000
[1]	Included in prepaid expenses and other current assets on the consolidated balance sheets.
[2]	The balances at December 31, 2014 and 2013 were related to derivative liabilities which are allowed to 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 $)	Dec. 31, 2014		Dec. 31, 2013
Foreign Exchange Forward [Member]
Offsetting Liabilities [Line Items]
Derivative Liability, Fair Value, Gross Liability	$915,000	[1]	$1,024,000	[2]
Derivative Liability, Fair Value, Gross Asset	0		0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	915,000		1,024,000
Derivative, Collateral, Right to Reclaim Securities	-62,000	[3]	-268,000	[3]
Derivative, Collateral, Right to Reclaim Cash	0		0
Derivative Liability, Fair Value, Amount Offset Against Collateral	$853,000		$756,000
[1]	Included in accrued liabilities and other liabilities on the consolidated balance sheets.
[2]	Included in accrued liabilities on the consolidated balance sheets.
[3]	The balances at December 31, 2014 and 2013 were related to derivative assets which are allowed to net settled against derivative liabilities in accordance with the master netting agreements.

Derivative_Financial_Instrumen5

Derivative Financial Instruments (Effects on the Accumulated Other Comprehensive Loss and Consolidated Statements of Income) (Details) (Foreign Exchange Forward [Member], Cash Flow Hedging [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in other comprehensive income (effective portion)	$1,270	($2,089)	($594)
Amount of gain (loss) reclassified from accumulated other comprehensive income to cost of service revenues and operating expenses (effective portion)	1,192	-1,869	-2,275
Gain from components excluded from assessment of cash flow hedge effectiveness, net	0	728	1,227
Loss on cash flow hedge ineffectiveness, net	135	0	0
Not Designated as Hedging Instrument [Member]
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Loss recognized in interest and other expense, net	($152)	($161)	($904)

Employee_401K_Plan_Details

Employee 401(K) Plan (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Maximum Annual Contribution Percentage Per Employee	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Maximum Annual Employer Matching Contribution Per Employee	$4,000
Employers Matching Contribution, Annual Vesting Percentage	100.00%
Total employer contribution	5,200,000	4,500,000	3,600,000
Defined Contribution Plan, Employer Discretionary Contribution Amount	$0

Income_Taxes_Provision_for_Inc

Income Taxes (Provision for Income Taxes) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current tax provision:
Federal	$39,903	$65,344	$35,481
State	7,982	10,167	4,337
Foreign	9,704	2,882	9,417
Total current tax provision	57,589	78,393	49,235
Deferred tax provision:
Federal	-859	-24,469	-3,044
State	1,686	-3,334	597
Foreign	-2,210	3,737	-2,203
Total deferred tax provision	-1,383	-24,066	-4,650
Total provision for income taxes	$56,206	$54,327	$44,585

Income_Taxes_Income_before_Inc

Income Taxes (Income before Income Taxes) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Domestic	$128,857	$118,939	$87,981
Foreign	41,436	21,783	49,786
Income before income taxes	$170,293	$140,722	$137,767

Income_Taxes_Reconciliation_of

Income Taxes (Reconciliation of Income Taxes Computed at the Federal Statutory Rate to the Provision for Income Taxes) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income tax provision, computed at federal statutory tax rate	$59,603	$49,253	$48,218
State taxes, net of federal benefit	5,970	4,208	3,276
Foreign earnings taxed at different rates	-4,292	5,395	-9,557
Stock-based compensation	4,475	3,397	3,270
Return to provision true-up	-2,238	-668	92
Research and development credits	-2,707	-3,715	0
Domestic manufacturing deduction	-4,025	-3,150	-2,100
Other	-580	-393	1,386
Total provision for income taxes	$56,206	$54,327	$44,585

Income_Taxes_Deferred_Tax_Asse

Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred tax assets:
Net operating loss carryforwards	$28,168	$23,710
Tax credit carryforwards	9,883	10,131
Deferred revenue	18,198	19,240
Reserves and accrued costs not currently deductible	15,984	15,097
Depreciable assets	7,767	6,450
Stock-based compensation	23,814	20,149
Other	2,100	381
Valuation allowance	-8,298	-4,552
Total deferred tax assets	97,616	90,606
Deferred tax liabilities:
Non-deductible intangible assets	-18,717	-12,887	[1]
Total deferred tax liabilities	-18,717	-12,887
Net deferred tax assets	78,899	77,719
Deferred Tax Liabilities, Gross, Noncurrent		$44
[1]	The Company included approximately $44 thousand of long-term deferred tax liabilities in other liabilities on the consolidated balance sheet as of December, 31, 2013.

Income_Taxes_Operating_Loss_Ca

Income Taxes (Operating Loss Carryforwards) (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$2.20
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Valuation Allowance	2.7
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$71.40

Income_Taxes_Tax_Credit_Carryf

Income Taxes (Tax Credit Carryforwards) (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Foreign Tax Authority [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards, Valuation Allowance	$2.70
Research Tax Credit Carryforward [Member] | State and Local Jurisdiction [Member]
Tax Credit Carryforward [Line Items]
Tax Credit Carryforward, Valuation Allowance	5.6
Tax Credit Carryforward Amount, Not Subject to Expiration	$6.20

Income_Taxes_Deferred_Tax_Liab

Income Taxes (Deferred Tax Liability Not Recognized) (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Income Tax Disclosure [Abstract]
Undistributed Earnings of Foreign Subsidiaries	$128.20

Income_Taxes_Unrecognized_Tax_

Income Taxes (Unrecognized Tax Benefits) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Contingency [Line Items]
Beginning balance	$29,174,000	$21,079,000	$16,298,000
Additions for tax positions of prior years	2,283,000	672,000	2,407,000
Reductions for tax positions of prior years	-636,000	-668,000	-475,000
Additions based on tax positions related to the current year	5,429,000	9,671,000	4,335,000
Reductions due to lapse of statute of limitations	-2,893,000	-1,580,000	-1,486,000
Reductions due to settlements	-162,000	0	0
Ending balance	33,195,000	29,174,000	21,079,000
Unrecognized tax benefits that would impact effective tax rate	27,100,000	25,900,000	18,900,000
Unrecognized Tax Benefits	33,195,000	29,174,000	21,079,000
Unrecognized tax benefits, income tax penalties and interest accrued	$2,100,000	$3,200,000

Income_Taxes_Additional_Inform

Income Taxes (Additional Information Regarding Examinations) (Details) (State and Local Jurisdiction, and Foreign Tax Authority [Member])	12 Months Ended
	Dec. 31, 2014
Lower Limit [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2004
Upper Limit [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2012

Net_Income_per_Common_Share_De

Net Income per Common Share (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Line Items]
Net income	$43,592	$22,813	$22,829	$24,853	$39,918	$10,404	$18,166	$17,907	$114,087	$86,395	$93,182
Weighted-average shares of common stock used to compute basic net income per share	108,663	109,231	109,739	109,164	108,462	108,305	108,138	107,669	109,199	108,146	107,874
Weighted Average Number Diluted Shares Outstanding Adjustment [Abstract]
Shares used in computing diluted net income per common share	109,988	110,314	111,601	111,935	111,457	111,501	111,344	111,263	110,960	111,394	112,089
Basic net income per common share	$0.40	$0.21	$0.21	$0.23	$0.37	$0.10	$0.17	$0.17	$1.04	$0.80	$0.86
Diluted net income per common share	$0.40	$0.21	$0.20	$0.22	$0.36	$0.09	$0.16	$0.16	$1.03	$0.78	$0.83
Weighted average stock options and restricted stock units excluded from calculation due to anti-dilutive effect									5,166	5,666	3,844
Stock Options [Member]
Weighted Average Number Diluted Shares Outstanding Adjustment [Abstract]
Incremental Common Shares Attributable to Share-based Payment Arrangements									1,004	2,925	3,863
Restricted Stock Units (RSUs) [Member]
Weighted Average Number Diluted Shares Outstanding Adjustment [Abstract]
Incremental Common Shares Attributable to Share-based Payment Arrangements									757	323	352

Commitments_and_Contingencies_1

Commitments and Contingencies (Lease Commitments) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Commitments and Contingencies Disclosure [Line Items]
Operating Leases, Rent Expense, Net	$14,700,000	$16,300,000	$15,100,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating Leases, Future Minimum Payments, Due in 2015	11,709,000
Operating Leases, Future Minimum Payments, Due in 2016	9,733,000
Operating Leases, Future Minimum Payments, Due in 2017	8,326,000
Operating Leases, Future Minimum Payments, Due in 2018	7,697,000
Operating Leases, Future Minimum Payments, Due in 2019	6,169,000
Operating Leases, Future Minimum Payments, Due Thereafter	8,363,000
Operating Leases, Total Future Minimum Payments Due	$51,997,000

Commitments_and_Contingencies_2

Commitments and Contingencies (Warranty Accrual) (Details)	12 Months Ended
	Dec. 31, 2014
Minimum [Member]
Product Liability Contingency [Line Items]
Product Warranty Period	3 months
Maximum [Member]
Product Liability Contingency [Line Items]
Product Warranty Period	6 months

Related_Party_Transaction_Deta

Related Party Transaction (Details) (Director [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Director [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	$1	$1.90	$1

Significant_Customer_Informati2

Significant Customer Information and Segment Information (Revenues) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Sales Revenue, Software, Net [Abstract]
License									$387,660	$367,074	$320,982
Subscription									69,704	46,664	29,193
Total software revenues									457,364	413,738	350,175
Sales Revenue, Services, Net [Abstract]
Maintenance									456,718	409,325	360,769
Consulting and education									133,872	125,108	100,627
Total service revenues									590,590	534,433	461,396
Total revenues	303,744	250,400	250,713	243,097	276,038	235,394	222,439	214,300	1,047,954	948,171	811,571
North America [Member]
Sales Revenue, Services, Net [Abstract]
Total revenues									688,186	642,707	524,191
EMEA [Member]
Sales Revenue, Services, Net [Abstract]
Total revenues									241,785	211,504	202,861
Other [Member]
Sales Revenue, Services, Net [Abstract]
Total revenues									$117,983	$93,960	$84,519

Significant_Customer_Informati3

Significant Customer Information and Segment Information (Long-Lived Assets) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, Plant and Equipment, Net	$159,708	$157,308
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, Plant and Equipment, Net	143,482	147,460
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, Plant and Equipment, Net	10,902	4,907
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, Plant and Equipment, Net	$5,324	$4,941

Significant_Customer_Informati4

Significant Customer Information and Segment Information (Additional Information) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	segment	segment	customers
	customers	customers
Segment Reporting Information [Line Items]
Number of Reportable Segments	1	1
Number of Customers with More Than Ten Percent of Revenues	0	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]
Percentage of international revenues	34.00%	32.00%	35.00%

Selected_Quarterly_Financial_I2

Selected Quarterly Financial Information (Unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$303,744	$250,400	$250,713	$243,097	$276,038	$235,394	$222,439	$214,300	$1,047,954	$948,171	$811,571
Gross Profit	252,390	200,320	201,634	195,764	228,794	189,838	177,854	170,404	850,108	766,890	658,949
Income from operations	65,440	33,405	33,826	36,817	61,027	27,206	25,931	24,699	169,488	138,863	135,959
Net income	$43,592	$22,813	$22,829	$24,853	$39,918	$10,404	$18,166	$17,907	$114,087	$86,395	$93,182
Earnings Per Share, Basic	$0.40	$0.21	$0.21	$0.23	$0.37	$0.10	$0.17	$0.17	$1.04	$0.80	$0.86
Earnings Per Share, Diluted	$0.40	$0.21	$0.20	$0.22	$0.36	$0.09	$0.16	$0.16	$1.03	$0.78	$0.83
Weighted Average Number of Shares Outstanding, Basic	108,663	109,231	109,739	109,164	108,462	108,305	108,138	107,669	109,199	108,146	107,874
Weighted Average Number of Shares Outstanding, Diluted	109,988	110,314	111,601	111,935	111,457	111,501	111,344	111,263	110,960	111,394	112,089

Acquisitions_Details

Acquisitions (Details) (USD $)	1 Months Ended			3 Months Ended	7 Months Ended	12 Months Ended
	Nov. 30, 2014	Feb. 28, 2013	Nov. 30, 2012	Mar. 31, 2013	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2012	Jun. 30, 2014	Nov. 28, 2012
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill						$523,142,000	$551,196,000	$510,121,000
Proact [Member]
Business Combination, Consideration Transferred [Abstract]
Payments to acquire businesses, gross	4,000,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets, other than goodwill	1,300,000
Goodwill	2,700,000
Total assets acquired, goodwill, and liabilities assumed, net	4,000,000
StrikeIron [Member]
Business Combination, Consideration Transferred [Abstract]
Amount of consideration placed into escrow									8,300,000
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
Goodwill									36,116,000
Total assets acquired, goodwill, and liabilities assumed, net									50,507,000
Acquiree's transaction related costs and debt settlement									4,138,000
Total Consideration									54,645,000
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
Active Endpoints [Member]
Business Combination, Consideration Transferred [Abstract]
Payments to acquire businesses, gross		10,000,000
Amount of consideration placed into escrow		1,500,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Net tangible assets acquired and liabilities assumed		-900,000
Intangible assets, other than goodwill		3,800,000
Goodwill		7,100,000
Total assets acquired, goodwill, and liabilities assumed, net		10,000,000
Goodwill, expected tax deductible amount		0
Heiler Software AG [Member]
Business Combination, Consideration Transferred [Abstract]
Payments to acquire businesses, gross			101,900,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Net tangible assets acquired and liabilities assumed			16,400,000
Noncontrolling interest,			-2,861,000
Total identifiable net assets, less noncontrolling interest			40,194,000
Goodwill			61,660,000
Total Cash Consideration or Recognized Assets Acquired and Liabilities Assumed, Less Noncontrolling Interest			101,854,000
Goodwill, expected tax deductible amount										0
Goodwill, purchase accounting adjustments				2,800,000		2,800,000
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest [Abstract]
Purchase of equity interest in acquiree for step acquisition					6,800,000
Total cash consideration and purchase of equity interest in acquiree for step acquisition					108,700,000
Equity interest in acquiree, including subsequent acquisition, percentage					100.00%			97.70%
Heiler Software AG [Member] | In Process Research And Development [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
In-process research and development			3,784,000
Heiler Software AG [Member] | Developed and Core Technology [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Finite-Lived Intangibles			16,586,000
Heiler Software AG [Member] | Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Finite-Lived Intangibles			5,339,000
Heiler Software AG [Member] | Contract Backlog [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Finite-Lived Intangibles			648,000
Heiler Software AG [Member] | Trade Names [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Finite-Lived Intangibles			$298,000

Subsequent_Event_Details

Subsequent Event (Details) (USD $)	12 Months Ended			0 Months Ended
In Millions, except Share data in Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 04, 2015	Feb. 26, 2015
					contracts
					counterparty
Subsequent Event [Line Items]
Stock Repurchased and Retired During Period, Shares	4,074	2,488	2,435
Subsequent Event [Member]
Subsequent Event [Line Items]
Accelerated Share Repurchases, Number of Agreements					2
Accelerated Share Repurchases Agreements, Number of Counterparties					2
Accelerated Share Repurchases, Agreement Amount					$300
Accelerated Share Repurchases, Upfront Payment					$300
Stock Repurchased and Retired During Period, Shares				5,700

Schedule_II_Valuation_and_Qual1

Schedule II - Valuation and Qualifying Accounts (Details) (Allowance for Doubtful Accounts [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Beginning Balance	$4,135	$5,460	$4,001
Valuation Allowances and Reserves, Charged to Costs and Expenses	-369	-1,157	428
Valuation Allowances and Reserves, Additions	217	6	1,139
Valuation Allowances and Reserves, Deductions	-518	-174	-108
Valuation Allowances and Reserves, Ending Balance	$3,465	$4,135	$5,460