Informatica Inactive 10-K21 Feb 142013 FY Annual reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Jan. 31, 2014	Jun. 28, 2013
Document and Entity Information [Abstract]	'	'	'
Entity Registrant Name	'INFORMATICA CORP	'	'
Entity Trading Symbol	'INFA	'	'
Entity Central Index Key	'0001080099	'	'
Document Type	'10-K	'	'
Document Period End Date	31-Dec-13	'	'
Amendment Flag	'false	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Well-Known Seasoned Issuer	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Public Float	'	'	$3,754,238
Entity Common Stock, Shares Outstanding	'	109,212	'

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:	'	'
Cash and cash equivalents	$297,818	$190,127
Short-term investments	379,616	345,478
Accounts receivable, net of allowances of $4,135 and $5,460, respectively	204,374	171,893
Deferred tax assets	32,898	23,350
Prepaid expenses and other current assets	34,541	29,396
Total current assets	949,247	760,244
Property and equipment, net	157,308	145,474
Goodwill	523,142	510,121
Other intangible assets, net	41,625	67,260
Long-term deferred tax assets	44,865	24,087
Other assets	6,834	5,031
Total assets	1,723,021	1,512,217
Current liabilities:	'	'
Accounts payable	10,124	8,885
Accrued liabilities	63,055	64,475
Accrued compensation and related expenses	71,314	55,382
Income taxes payable	14,184	0
Deferred revenues	285,184	241,968
Total current liabilities	443,861	370,710
Long-term deferred revenues	12,938	8,807
Long-term deferred tax liabilities	44	2,523
Long-term income taxes payable	29,878	21,195
Other liabilities	550	3,459
Total liabilities	487,271	406,694
Commitments and contingencies (Note 14)	'	'
Equity:	'	'
Common stock, $0.001 par value; 200,000 shares authorized; 108,643 shares and 107,301 shares issued and outstanding at December 31, 2013 and 2012, respectively	109	107
Additional paid-in capital	805,728	764,298
Accumulated other comprehensive loss	-3,212	-8,030
Retained earnings	433,125	346,730
Total Informatica Corporation stockholders' equity	1,235,750	1,103,105
Noncontrolling interest	0	2,418
Total equity	1,235,750	1,105,523
Total liabilities and equity	$1,723,021	$1,512,217

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:	'	'
Accounts receivable, allowances	$4,135	$5,460
Equity:	'	'
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	200,000	200,000
Common stock, shares issued	108,643	107,301
Common stock, shares outstanding	108,643	107,301

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues:	'	'	'
Software	$413,738	$350,175	$372,229
Service	534,433	461,396	411,550
Total revenues	948,171	811,571	783,779
Cost of revenues:	'	'	'
Software	9,838	7,844	8,121
Service	149,136	122,798	115,831
Amortization of acquired technology	22,307	21,980	19,503
Total cost of revenues	181,281	152,622	143,455
Gross profit	766,890	658,949	640,324
Operating expenses:	'	'	'
Research and development	165,875	143,607	132,528
Sales and marketing	374,315	305,682	278,073
General and administrative	77,641	63,616	57,373
Amortization of intangible assets	7,729	6,578	7,717
Facilities restructuring and facility lease termination costs (benefit), net	0	710	-1,094
Acquisitions and other charges	2,467	2,797	1,029
Total operating expenses	628,027	522,990	475,626
Income from operations	138,863	135,959	164,698
Interest income	3,486	3,993	4,813
Interest expense	-462	-497	-2,126
Other expense, net	-1,165	-1,688	-757
Income before income taxes	140,722	137,767	166,628
Income tax provision	54,327	44,585	49,133
Net income	$86,395	$93,182	$117,495
Basic net income per common share	$0.80	$0.86	$1.13
Diluted net income per common share	$0.78	$0.83	$1.05
Shares used in computing basic net income per common share	108,146	107,874	103,956
Shares used in computing diluted net income per common share	111,394	112,089	112,540

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net income	$86,395	$93,182	$117,495
Other comprehensive income (loss):	'	'	'
Change in foreign currency translation adjustment, net of tax benefit (expense) of $(172), $(144) and $106	5,133	3,363	-5,972
Available-for-sale investments:	'	'	'
Change in net unrealized gain (loss), net of tax benefit (expense) of $126, $(244), and $133	-205	398	-217
Less: reclassification adjustment for net (gain) loss included in net income, net of tax benefit (expense) of $16, $(19), and $(40)	26	-31	-65
Net change, net of tax benefit (expense) of $110, $(225), and $173	-179	367	-282
Cash flow hedges:	'	'	'
Change in unrealized loss, net of tax benefit of $794, $226, and $1,534	-1,295	-368	-2,503
Less: reclassification adjustment for net loss included in net income, net of tax benefit of $710, $865, and $910	1,159	1,410	1,485
Net change, net of tax benefit (expense) of $84, $(639), and $624	-136	1,042	-1,018
Total other comprehensive income (loss), net of tax effect	4,818	4,772	-7,272
Total comprehensive income, net of tax effect	$91,213	$97,954	$110,223

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Portion Attributable to Parent [Abstract]	'	'	'
Tax benefit (expense) related to foreign currency translation adjustment	($172)	($144)	$106
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	126	-244	133
Less: Tax benefit (expense) related to reclassification adjustment for sale of securities included in net income	16	-19	-40
Tax benefit (expense) related to available-for-sale investments	110	-225	173
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Portion Attributable to Parent [Abstract]	'	'	'
Tax benefit related to unrealized loss on cash flow hedges arising during the period	794	226	1,534
Less: Tax benefit related to reclassification adjustment on cash flow hedges included in net income	710	865	910
Tax benefit (expense) related to cash flow hedges	$84	($639)	$624

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, except Share data	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings [Member]	Parent [Member]	Noncontrolling Interest [Member]
Total equity, beginning balance at Dec. 31, 2010	$644,982	'	'	'	'	'	'
Stockholders' equity attributable to noncontrolling interest, beginning balance at Dec. 31, 2010	'	'	'	'	'	'	0
Total Informatica Corporation stockholders' equity, beginning balance at Dec. 31, 2010	'	94	514,365	-5,530	136,053	644,982	'
Shares, issued at beginning of the year at Dec. 31, 2010	'	94,461,000	'	'	'	'	'
Common stock options exercised, shares	3,245,000	3,245,000	'	'	'	'	'
Common stock options exercised, value	43,414	4	43,410	'	'	43,414	'
Common stock issued under employee stock purchase plans, shares	'	498,000	'	'	'	'	'
Common stock issued under employee stock purchase plan, value	15,312	1	15,311	'	'	15,312	'
Restricted stock units vested, shares	'	407,000	'	'	'	'	'
Restricted stock units vested, value	0	0	0	'	'	0	'
Withholding taxes related to restricted stock units net share settlement, shares	'	-124,000	'	'	'	'	'
Withholding taxes related to restricted stock units net share settlement, value	-6,218	-1	-6,217	'	'	-6,218	'
Stock-based compensation, value	33,263	'	33,263	'	'	33,263	'
Tax benefit of stock-based compensation	29,096	'	29,096	'	'	29,096	'
Stock repurchased and retired during period, shares	-1,574,612	-1,575,000	'	'	'	'	'
Stock repurchased and retired during period, value	-74,492	-1	-74,491	'	'	-74,492	'
Conversion of convertible senior notes, shares	'	10,034,000	'	'	'	'	'
Conversion of convertible senior notes, value	196,623	10	196,613	'	'	196,623	'
Net income	117,495	'	'	'	117,495	117,495	0
Other comprehensive income (loss), net of tax	-7,272	'	'	-7,272	'	-7,272	0
Total equity, ending balance at Dec. 31, 2011	992,203	'	'	'	'	'	'
Stockholders' equity attributable to noncontrolling interest, ending balance at Dec. 31, 2011	'	'	'	'	'	'	0
Total Informatica Corporation stockholders' equity, ending balance at Dec. 31, 2011	'	107	751,350	-12,802	253,548	992,203	'
Shares, issued at end of the year at Dec. 31, 2011	'	106,946,000	'	'	'	'	'
Common stock options exercised, shares	1,884,000	1,884,000	'	'	'	'	'
Common stock options exercised, value	25,243	2	25,241	'	'	25,243	'
Common stock issued under employee stock purchase plans, shares	'	528,000	'	'	'	'	'
Common stock issued under employee stock purchase plan, value	16,108	0	16,108	'	'	16,108	'
Restricted stock units vested, shares	'	535,000	'	'	'	'	'
Restricted stock units vested, value	0	0	0	'	'	0	'
Withholding taxes related to restricted stock units net share settlement, shares	'	-157,000	'	'	'	'	'
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	-2,434,647	-2,435,000	'	'	'	'	'
Stock repurchased and retired during period, value	-80,983	-2	-80,981	'	'	-80,983	'
Conversion of convertible senior notes, value	0	'	'	'	'	'	'
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	'	'	'	'	'	2,418
Total Informatica Corporation stockholders' equity, ending balance at Dec. 31, 2012	1,103,105	107	764,298	-8,030	346,730	1,103,105	'
Shares, issued at end of the year at Dec. 31, 2012	107,301,000	107,301,000	'	'	'	'	'
Common stock options exercised, shares	2,671,000	2,671,000	'	'	'	'	'
Common stock options exercised, value	40,711	3	40,708	'	'	40,711	'
Common stock issued under employee stock purchase plans, shares	'	652,000	'	'	'	'	'
Common stock issued under employee stock purchase plan, value	17,958	1	17,957	'	'	17,958	'
Restricted stock units vested, shares	'	711,000	'	'	'	'	'
Restricted stock units vested, value	0	0	0	'	'	0	'
Withholding taxes related to restricted stock units net share settlement, shares	'	-204,000	'	'	'	'	'
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	-2,487,957	-2,488,000	'	'	'	'	'
Stock repurchased and retired during period, value	-92,068	-2	-92,066	'	'	-92,068	'
Conversion of convertible senior notes, value	0	'	'	'	'	'	'
Noncontrolling interest from acquisition	'	0	0	'	'	0	'
Noncontrolling interest, redemptions or purchase of Interests	-2,418	'	'	'	'	'	-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	'	'	'	'	'	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	108,643,000	108,643,000	'	'	'	'	'

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating activities:	'	'	'
Net income	$86,395	$93,182	$117,495
Adjustments to reconcile net income to net cash provided by operating activities:	'	'	'
Depreciation and amortization	14,978	12,284	6,274
Stock-based compensation	57,204	42,803	33,263
Deferred income taxes	-24,067	-4,651	57
Tax benefits from stock-based compensation	26,082	16,463	29,096
Excess tax benefits from stock-based compensation	-27,495	-17,021	-29,952
Amortization of intangible assets and acquired technology	30,036	28,558	27,220
Other operating activities, net	-352	-854	-3,000
Changes in operating assets and liabilities:	'	'	'
Accounts receivable	-32,009	8,723	-28,272
Prepaid expenses and other assets	418	10,593	-20,218
Accounts payable and accrued liabilities	-658	2,320	7,523
Accrued compensation and related expenses	14,497	-4,602	1,692
Income taxes payable	9,596	1,553	12,860
Accrued facilities restructuring charges	0	-23,977	-14,358
Deferred revenues	46,525	35,127	34,795
Net cash provided by operating activities	201,150	200,501	174,475
Investing activities:	'	'	'
Purchases of property and equipment	-26,508	-141,610	-12,743
Purchases of investments	-367,584	-266,088	-350,951
Investment in equity interest, net	-2,001	-257	542
Maturities of investments	187,947	89,381	118,941
Sales of investments	144,570	119,018	208,025
Business acquisitions, net of cash acquired	-7,464	-90,542	-32,969
Purchase of developed technology	-400	0	0
Net cash used in investing activities	-71,440	-290,098	-69,155
Financing activities:	'	'	'
Net proceeds from issuance of common stock	58,669	41,351	58,727
Repurchases and retirement of common stock	-92,068	-80,983	-74,492
Redemption of convertible senior notes	0	0	-4
Withholding taxes related to restricted stock units net share settlement	-7,342	-6,686	-6,218
Payment of contingent consideration	-4,170	-8,050	-1,000
Excess tax benefits from stock-based compensation	27,495	17,021	29,952
Purchase of acquiree stock and noncontrolling interest	-6,365	-437	0
Net cash provided by (used in) financing activities	-23,781	-37,784	6,965
Effect of foreign exchange rate changes on cash and cash equivalents	1,762	673	-4,349
Net increase (decrease) in cash and cash equivalents	107,691	-126,708	107,936
Cash and cash equivalents at beginning of the year	190,127	316,835	208,899
Cash and cash equivalents at end of the year	297,818	190,127	316,835
Supplemental disclosures:	'	'	'
Interest Paid	0	0	1,251
Income taxes paid, net of refunds	42,717	31,218	7,119
Supplemental disclosures of non-cash investing and financing activities:	'	'	'
Unrealized gain (loss) on investments	-179	367	-282
Conversion of convertible senior notes	$0	$0	$196,623

Organization_and_Business

Organization and Business	12 Months Ended
Organization and Business	Dec. 31, 2013
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 data integration software and services. The Company's solutions enable a wide variety of complex, enterprise-wide data integration initiatives through technologies including data integration, data quality, information lifecycle management, data exchange, and master data management.

Summary_of_Significant_Account

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

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.

In November 2012, the Company acquired a majority interest in the shares of Heiler Software at the end of the initial acceptance period of the takeover offer. 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 Company consolidated the financial results of Heiler Software with its financial results beginning in November 2012. The noncontrolling interest position was reported as a separate component of consolidated equity from the equity attributable to the Company's stockholders as of December 31, 2012. The noncontrolling interest in the Company's net income was not significant to consolidated results for the years ended December 31, 2013 and 2012 and therefore has been included as a component of other expense, net in the consolidated statements of income.

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. 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

During the first quarter of 2013, the Company performed a review of the presentation of certain of its revenue categories and adopted a revised presentation, which the Company believes more accurately reflects its evolving product and service offerings. A change was made to rename other revenues to subscription revenues and present subscription revenues and license revenues as software revenues. Other revenues were previously presented in services revenues. A corresponding change was made to present cost of license revenues and cost of other revenues as cost of software revenues. This change in presentation did not affect total revenues, total cost of revenues or total gross margin. Conforming changes have been made for all prior periods presented. Subscription revenues of $29.2 million and $18.6 million for the years ended December 31, 2012, and 2011, respectively, were reclassified from service revenues to software revenues. Cost of subscription revenues of $3.4 million and $3.1 million for the years ended December 31, 2012 and 2011, respectively, were reclassified from cost of service revenues to cost of software revenues.

Revenue Recognition

The Company derives its revenues from sales of software licenses, subscription-based licenses for a variety of cloud and address validation 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 No. 104 (“SAB 104”), 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 for address validation offerings, 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 address validation 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 fiscal years 2013, 2012, and 2011, the Company did not consider any 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 fiscal years 2013, 2012, and 2011, 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, 2013 and 2012, the Company's allowance for doubtful accounts was $4.1 million and $5.5 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 nine 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 $2.4 million of internal use software costs for the year ended December 31, 2012. 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 fiscal 2013, 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, 2013, 2012, and 2011 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 2013, 2012, or 2011.

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, 2013 (in thousands):

Quoted

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)

21,893

—

Time deposits (ii)

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

The following table summarizes financial assets and financial liabilities that the Company measures at fair value on a recurring basis as of December 31, 2012 (in thousands):

Quoted

Prices in

Significant

Active

Other

Significant

Markets for

Observable

Unobservable

Identical

Inputs

Total

Assets

(Level 2)

(Level 3)

(Level 1)

Assets:

Money market funds (i)

18,565

—

Time deposits (ii)

17,437

—

Marketable debt securities (ii)

328,041

—

328,041

—

Total assets

364,043

36,002

328,041

—

Liabilities:

Foreign currency derivatives (iv)

408

—

408

—

Acquisition-related contingent consideration (v)

9,230

—

9,230

Total liabilities

9,638

—

408

9,230

___________________

(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 expectations 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 assets and liabilities, which include interest rates and credit risk. The Company 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, 2013 and 2012.

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 our own assumptions in measuring fair value. There were no transfers into or out of the Level 3 category during the years ended December 31, 2013 and 2012. 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, 2013 consisted of the following (in thousands):

December 31, 2013

Beginning balance as of December 31, 2012

9,230

Change in fair value of contingent consideration

(1,989

)

Payment of contingent consideration

(4,170

)

Ending balance as of December 31, 2013

3,071

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 $4.1 million and $2.1 million at December 31, 2013 and 2012, 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 fiscal years 2013, 2012, and 2011, the Company did not consider these investments to be other-than-temporarily impaired.

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 negligible for the years ended December 31, 2013, 2012, and 2011.

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.

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 December 2011, the FASB issued Accounting Standard Update ("ASU") No. 2011-11, Balance Sheet (Topic 210) - Disclosures about Offsetting Assets and Liabilities. ASU 2011-11 requires an entity to disclose additional information about offsetting and related arrangements to enable users of the financial statements to understand the effect of those arrangements on the financial position. In January 2013, the FASB issued ASU No. 2013-01, Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities, which clarifies that the scope of ASU 2011-11 applies to derivatives accounted for in accordance with Topic 815, Derivatives and Hedging, including bifurcated embedded derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and securities lending transactions that are either offset or subject to an enforceable master netting arrangement. The Company adopted both standards as required on January 1, 2013 and adoption did not impact the Company's consolidated financial statements.

In February 2013, the FASB issued ASU 2013-02, Comprehensive Income (Topic 220) - Reporting of Amounts Reclassified Out Of Accumulated Other Comprehensive Income. ASU 2013-02 requires an entity to present, either on the face of its statement where net income is presented or in a note, the effect of significant reclassifications out of accumulated other comprehensive income if the amount being reclassified is required under GAAP to be reclassified in its entirety to net income. For amounts that are not required under GAAP to be reclassified in their entirety to net income in the same reporting period, an entity is required to cross-reference to other related disclosures that provide additional detail. The Company adopted ASU 2013-02 prospectively as required on January 1, 2013 by electing to present the required information in a single footnote. Adoption of this new amended guidance did not have a material impact on the Company's disclosures to its financial statements.

In March 2013, the FASB issued 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. ASU 2013-05 will be effective for the Company in 2014, which will be applied prospectively. The Company does not expect its adoption of ASU 2013-05 to have a material impact on its 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 guidance will be effective prospectively for reporting periods beginning after December 15, 2013. The Company does not expect its adoption of ASU 2013-11 to have a material impact on its consolidated financial statements or disclosures.

Cash_Cash_Equivalents_and_Shor

Cash, Cash Equivalents, and Short-Term Investments	12 Months Ended
	Dec. 31, 2013
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, 2013 and 2012 was negligible, and for the year ended December 31, 2011 was approximately $0.3 million. The cost of securities sold was determined based on the specific identification method.

	The following table summarizes the Company’s cash, cash equivalents, and short-term investments as of 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 (i)	$	677,333		$	404		$	(303	)		$	677,434

	The following table summarizes the Company’s cash, cash equivalents, and short-term investments as of December 31, 2012 (in thousands):


					Gross			Gross				Estimated
		Cost			Unrealized			Unrealized				Fair Value
					Gains			Losses
	Cash	$	171,562		$	—		$	—			$	171,562

	Cash equivalents:

	Money market funds	18,565			—			—				18,565

	Total cash equivalents	18,565			—			—				18,565

	Total cash and cash equivalents	190,127			—			—				190,127

	Short-term investments:

	Certificates of deposit	2,246			3			—				2,249

	Commercial paper	6,294			—			—				6,294

	Corporate notes and bonds	151,133			322			(56		)		151,399

Federal agency notes and bonds	104,961			128			(10		)		105,079

Time deposits	17,437			—			—				17,437

U.S. government notes and bonds	7,094			18			—				7,112

Municipal notes and bonds	55,922			18			(32		)		55,908

Total short-term investments	345,087			489			(98		)		345,478

Total cash, cash equivalents, and short-term investments (i)	$	535,214		$	489		$	(98	)		$	535,605

____________________

(i)	Total estimated fair value above included $413.9 million and $364.0 million comprised of cash equivalents and short-term investments at December 31, 2013 and 2012, respectively.
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, 2013 (in thousands):


	Less Than 12 months
				Gross
	Fair Value			Unrealized
				Losses
Corporate notes and bonds	$	73,860		$	(220	)

Federal agency notes and bonds	41,260			(69		)

Municipal notes and bonds	22,816			(14		)

Total	$	137,936		$	(303	)

As of December 31, 2013, the Company did not have any investments that were in a continuous unrealized loss position for periods greater than 12 months. 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, 2013 (in thousands):


	Cost			Fair Value
Due within one year	$	149,626		$	149,680

Due in one year to two years	139,428			139,637

Due after two years	90,461			90,299

Total	$	379,515		$	379,616

Property_and_Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2013
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, 2013 and 2012 (in thousands):


		Estimated	December 31,
		Useful Lives	2013			2012
	Land	N/A	$	20,637		$	20,637

	Buildings	25 years	105,725			105,725

	Site improvements	15 years	1,199			1,162

	Building improvements	10-15 years	11,246			161

	Total land and buildings		138,807			127,685

	Computer and equipment	1-5 years	62,423			55,568

	Furniture and fixtures	3-5 years	8,287			6,849

	Leasehold improvements	1-9 years	14,454			24,530

	Total property and equipment		223,971			214,632

	Less: Accumulated depreciation and amortization		(66,663		)	(69,158		)
	Total property and equipment, net		$	157,308		$	145,474

	Depreciation and amortization expense was $15.0 million, $12.3 million, and $6.3 million in 2013, 2012, and 2011, respectively.
	In 2012, the Company purchased the property at 2000 and 2100 Seaport Boulevard in Redwood City, California, which the Company occupied from August 2001 through December 2004 as its former corporate headquarters. In the third quarter of 2013, the Company relocated its corporate headquarters to the purchased property. The property consists of two office buildings and the associated 11.6 acres of land. The transaction has been accounted for as a purchase of an asset that was previously subject to an operating lease during the lease term in accordance with ASC 840, Leases. The purchase of the property totaled approximately $148.6 million in cash. The Company recorded a charge of approximately $21.2 million representing the cost to terminate the operating lease in the consolidated statement of income during the year ended December 31, 2012. The net purchase price of the land and buildings was $127.5 million, which represents the fair value at date of purchase. The net purchase price was allocated as $105.7 million to buildings, $20.6 million to land, and $1.2 million to site improvements. The building, building improvements and site improvements are depreciated on a straight-line basis over the estimated useful life of 25 years, 10-15 years and 15 years, respectively.

Intangible_Assets_and_Goodwill

Intangible Assets and Goodwill	12 Months Ended
	Dec. 31, 2013
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, 2013 and 2012 are as follows (in thousands, except years):


		December 31, 2013							December 31, 2012							Weighted
																Average
																Useful Life
		Cost		Accumulated			Net		Cost		Accumulated			Net		(Years)
				Amortization							Amortization
	Developed and core technology	$	130,744	$	(99,026	)	$	31,718	$	123,221	$	(76,721	)	$	46,500	6

	Other intangible assets:
	Customer relationships	41,683		(35,216		)	6,467		40,952		(30,063		)	10,889		6

	All other (1)	17,205		(13,765		)	3,440		17,208		(11,187		)	6,021		11-Apr

	Total other intangible assets	58,888		(48,981		)	9,907		58,160		(41,250		)	16,910

	Total intangible assets subject to amortization	189,632		(148,007		)	41,625		181,381		(117,971		)	63,410

	In-process research and development	—		—			—		3,850		—			3,850		N.A.

	Total intangible assets, net	$	189,632	$	(148,007	)	$	41,625	$	185,231	$	(117,971	)	$	67,260

	____________________

	(i)	All other includes vendor relationships, trade names, covenants not to compete, and patents.
	Total amortization expense related to intangible assets was $30.0 million, $28.6 million, and $27.2 million for the years ended December 31, 2013, 2012, and 2011, respectively. 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. Of the $27.2 million amortization of intangible assets recorded in 2011, $7.7 million was recorded in operating expenses and $19.5 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, 2013, 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
	2014	$	13,017	$	4,730		$	17,747

	2015	8,611		2,097			10,708

	2016	5,082		1,299			6,381

	2017	3,163		863			4,026

	2018	1,395		439			1,834

	Thereafter	450		479			929

	Total intangible assets subject to amortization	$	31,718	$	9,907		$	41,625

	During the year ended December 31, 2012, the Company recorded in-process research and development (IPR&D) of $3.8 million associated with the acquisition of a majority interest in Heiler Software. The IPR&D capitalized costs were associated with software development efforts in process at the time of the business combination that had not yet achieved technological feasibility and no future alternative uses had been identified. Technological feasibility was achieved during 2013 for the IPR&D from the acquisition, which was reclassified to developed technology and will be amortized over the expected useful life of the technology. See Note 19. Acquisitions for further discussion of intangible assets from acquisitions.
	The changes in the carrying amount of goodwill for the years ended December 31, 2013 and 2012 are as follows (in thousands):


		December 31,
		2013		2012
	Beginning balance	$	510,121	$	432,269

	Goodwill from acquisitions	7,110		76,669

	Subsequent goodwill adjustments	5,911		1,183

	Ending balance	$	523,142	$	510,121

	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. During the year ended December 31, 2012, the Company recorded subsequent goodwill adjustments of $1.2 million which consist of foreign currency translation adjustments of $1.9 million, partially offset by other credit adjustments of $0.7 million resulting from differences between provisional estimates of liabilities and assets recorded at the time of the acquisition and the actual amounts within the measurement period related to prior acquisitions. See Note 19. Acquisitions for further discussion of goodwill from acquisitions.

Borrowings

Borrowings	12 Months Ended
Borrowings	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Borrowings	'
	Borrowings
	Credit Agreement
	On September 29, 2010, the Company entered into a Credit Agreement (the "Credit Agreement") that matures 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 by an aggregate amount of up to $30.0 million with new or additional commitments, for a total credit facility of up to $250.0 million. No amounts were outstanding under the Credit Agreement as of December 31, 2013 and 2012, and a total of $220.0 million remained available for borrowing.
	Revolving loans accrue interest at a per annum rate based on either, at our election, (i) the base rate plus a margin ranging from 1.00% to 1.75% depending on the Company's consolidated leverage ratio, or (ii) LIBOR (based on 1-, 2-, 3-, or 6-month interest periods) plus a margin ranging from 2.00% to 2.75% 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) LIBOR for a 1-month interest period plus a margin equal to 1.00%. Revolving loans may be borrowed, repaid and reborrowed until September 29, 2014, at which time all amounts borrowed must be repaid. Accrued interest on the revolving loans is payable quarterly in arrears with respect to base rate loans and 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 LIBOR 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 0.35% to 0.50% 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 LIBOR 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 an event of 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 for base rate loans for any other overdue amounts. The Company was in compliance with all covenants under the Credit Agreement as of December 31, 2013.

Stockholders_Equity

Stockholders' Equity	12 Months Ended
Stockholders' Equity	Dec. 31, 2013
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, 2013 and 2012, 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, 2013.
	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. As of December 31, 2013, $4.0 million remained available for repurchase under this program. In January 2014, the Company announced that the Board of Directors approved the repurchase of up to an additional $100.0 million of the Company's outstanding stock.
	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 2,487,957 shares for $92.1 million, 2,434,647 shares for $81.0 million, and 1,574,612 shares for $74.5 million in fiscal 2013, 2012, and 2011, respectively.

StockBased_Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Share-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, 2013, there were approximately 2,994,056 options outstanding under the 1999 Incentive Plan.
	Assumed Option Plans
	In connection with the acquisition of Itemfield in 2006, the Company assumed options in the Itemfield 2003 Stock Option Plan (the "Itemfield Plan"). As of December 31, 2013, the Company had 50 options outstanding under the Assumed Plan. As a result of the acquisition of Siperian in 2010, the Company assumed unvested in the money options under the Siperian 2003 Equity Incentive Plan (the "Siperian Plan") that were converted to unvested options to purchase the Company's common stock. As of December 31, 2013, there were 12,245 options outstanding under the Siperian Plan. No further options will be granted under these assumed option plans.
	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. 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.
	During 2013, the Company granted 2,267,152 options, 834,950 RSUs, and 649,900 performance-based restricted stock units ("PRSUs") under the 2009 Incentive Plan to certain employees, executives and directors of the Company. During 2012, the Company granted 2,844,150 options and 1,094,884 RSUs under the 2009 Incentive Plan to certain employees, executives and directors of the Company. During 2011, the Company granted 1,339,310 options and 733,111 RSUs under the 2009 Incentive Plan to certain employees, executives and directors of the Company. As of December 31, 2013, there were 4,823,800 shares available for grant and 11,799,058 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 1,778,000 unvested RSUs, 1,498,000 RSUs were granted at the 2.37 ratio, and 280,000 were granted at the 1.52 ratio. All 507,000 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.
	Performance-Based Restricted Stock Units
	The performance period for the PRSUs granted in 2013 was the 2013 fiscal year. If certain performance goals were met, PRSUs would have become eligible to vest, with one fourth vesting on the first anniversary date of the grant, and the remaining three fourths vesting evenly on the following three annual anniversary dates of the grant, contingent upon the recipient’s continued service to the company. Certain participants had the ability to receive up to 110% to 125% of the target number of shares originally granted.
	The performance period for the PRSUs granted in 2012 was the 2012 fiscal year. If certain performance goals were met, PRSUs would have become eligible to vest, with one fourth vesting on the first anniversary date of the grant, and the remaining three fourths vesting evenly on the following three annual anniversary dates of the grant, contingent upon the recipient’s continued service to the company. Certain participants had the ability to receive up to 150% of the target number of PRSUs originally granted.
	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 committee may establish from time to time of their eligible compensation. Currently, the 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, 2013, the Company had 6,172,544 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 employee stock options granted is derived from historical exercise patterns of the options, and the expected term of ESPP is based on the contractual terms. The expected term of options granted to employees is derived from the historical option exercises, post-vesting cancellations, and estimates concerning future exercises and cancellations for vested and unvested options that remain outstanding. The risk-free interest rate for the expected term of the option and ESPP is based on the U.S. Treasury yield curve in effect at the time of grant. The Company recognizes its stock-based compensation related to options using a straight-line method over the vesting term of the awards.
	The 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 2011, 2012 and 2013.
	The fair value of the Company's stock-based awards was estimated based on the following assumptions:


		Years Ended December 31,
		2013				2012				2011
	Option grants:
	Expected volatility	41 - 43		%		39 - 48		%		35 - 43		%

	Weighted-average volatility	41		%		44		%		36		%

	Expected dividends	—				—				—

	Expected term of options (in years)	3.3				3.3				3.8

	Risk-free interest rate	0.7		%		0.5		%		1.5		%

	ESPP:
	Expected volatility	37 - 42		%		43 - 53		%		35 - 38		%

	Weighted-average volatility	40		%		49		%		36		%

	Expected dividends	—				—				—

	Expected term of ESPP (in years)	0.5				0.5				0.5

	Risk-free interest rate	0.1		%		0.1		%		0.2		%

	The allocation of the stock-based compensation, net of estimated income tax benefit, is as follows (in thousands):



		Years Ended December 31,
		2013				2012				2011
	Cost of service revenues	$	5,525			$	4,349			$	3,539

	Research and development	19,002				14,919				10,848

	Sales and marketing	19,323				13,518				10,185

	General and administrative	13,354				10,017				8,691

Total stock-based compensation	57,204				42,803				33,263

Estimated tax benefit of stock-based compensation	(15,934		)		(10,994		)		(8,490		)
Total stock-based compensation, net of tax benefit	$	41,270			$	31,809			$	24,773

In connection with the acquisition of Heiler Software, $1.1 million of post-combination stock-based compensation expense was recorded to accrued liabilities due to the Company's contractual requirement to settle all outstanding options with cash upon the squeeze-out.

Stock Option Activity
A summary of stock option activity through December 31, 2013 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, 2010	12,361			$	14.73			3.87		$	362,236

Granted	1,339			48.28

Exercised	(3,245	)		13.38

Forfeited or expired	(226	)		22.76

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

Exercisable at December 31, 2013	6,095			$	24.34			2.32		$	111,562

The following table summarizes information about stock options as of December 31, 2013 (number of options in thousands):



		Options Outstanding									Options Exercisable
		Number			Weighted-Average		Weighted				Number		Weighted
Range of		of			Remaining		Average				of		Average
Exercise Prices		Options			Contractual Life		Exercise Price				Options		Exercise Price
					(Years)		Per Share						Per Share
$4.23 to $13.14		1,611			0.6		$	6.85			1,611		$	6.85

$13.86 to $24.38		2,092			1.65		$	19.22			2,067		$	19.16

$25.46 to $37.43		2,867			5.42		$	33.15			899		$	30.96

$38.11 to $44.06		1,798			5.04		$	42.51			744		$	43.52

$46.63 to $54.93		996			3.52		$	47.87			714		$	47.74

$56.27 to $56.27		60			4.4		$	56.27			60		$	56.27

		9,424			3.48		$	29.05			6,095		$	24.34

The fair value of options vesting during the years ended December 31, 2013, 2012, and 2011 was approximately $18.5 million, $15.6 million, and $14.5 million, respectively. As of December 31, 2013, there was a total of approximately 3,329,000 unvested options with a fair value of $31.4 million and average grant price of $37.69. The Company expects to recognize the fair value of the unvested shares over a weighted-average period of 2.62 years.
Restricted Stock Unit Activity
The Company started granting RSUs in 2009. A summary of RSU activity through December 31, 2013 is presented below (in thousands, except per share amounts):


				Weighted-
				Average
	Number of			Grant Date
	Shares			Fair Value
Outstanding at December 31, 2010	1,405

Awarded	733			$	50

Released	(407	)		$	50.55

Forfeited	-120			$	29

Outstanding at December 31, 2011	1,611

Awarded	1,095			$	40.13

Released	-535			$	42.16

Forfeited	-244			$	39.3

Outstanding at December 31, 2012	1,927

Awarded	835			$	35.5

Released	-711			$	35.74

Forfeited	-258			$	39.91

Outstanding at December 31, 2013	1,793

As of December 31, 2013, there were approximately 15,000 vested deferred RSUs outstanding and not yet released included in the RSU activity above. As of December 31, 2013, there was a total of approximately 1,778,000 unvested RSUs with a fair value of $45.0 million. The Company expects to recognize the fair value of the unvested RSUs over a weighted-average period of 2.56 years.
Performance-Based Restricted Stock Unit Activity
The Company started granting PRSUs in 2012. The performance period for the 649,900 target number of PRSUs granted in 2013 was the 2013 fiscal 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 fiscal 2014, the Compensation Committee of the Board of Directors certified actual performance achievement for PRSUs granted in 2013, and as a result, 507,000 shares became eligible to vest. One fourth of the shares vested in the first quarter of 2014 and the remaining three fourths vest evenly on the following three annual anniversary dates of the grant, contingent upon the recipient's continued service to the Company. As of December 31, 2013, there was a total of approximately 507,000 unvested PRSUs with a fair value of $8.0 million. The Company expects to recognize the fair value of the unvested PRSUs over a weighted-average period of 1.59 years.
The performance period for the 224,000 target number of PRSUs granted in 2012 was the 2012 fiscal year. Certain participants had the ability to receive up to 150% of the target number of PRSUs originally granted. In the first quarter of fiscal 2013, the Compensation Committee of the Board of Directors 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.
Disclosures Pertaining to All Stock-based Compensation Plans
The weighted-average fair value of options granted with exercise prices equal to fair market value at the date of grant under stock options plans during 2013, 2012, and 2011 was $8.96, $12.06, and $14.15, respectively. No options were granted with exercise prices less than fair value at the date of grant in 2013, 2012, and 2011. The total intrinsic value of options exercised for the years ended, December 31, 2013, 2012, and 2011 was $58.4 million, $53.5 million, and $117.6 million, respectively. The weighted average grant date fair value of unvested RSUs for the years ended December 31, 2013, 2012, and 2011 was $38.50, $38.08, and $34.47, respectively. The RSUs granted in 2013 vest in 2014 through 2017. The weighted-average grant date fair value of unvested PRSUs for the year ended December 31, 2013 was $37.42. The weighted-average grant date fair value of employee stock purchase shares granted under the ESPP for the years ended December 31, 2013, 2012, and 2011 was $10.01, $9.93, and $12.34, respectively. The total intrinsic value of stock purchase shares granted under the ESPP exercised during the years ended December 31, 2013, 2012, and 2011 was $6.5 million, $2.8 million, and $8.7 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, 2013, 2012, and 2011 were $58.7 million, $41.4 million, and $58.7 million, respectively. The total realized tax benefits attributable to stock options exercised and restricted stock units vested were $26.1 million, $16.5 million, and $29.1 million for the years ended December 31, 2013, 2012, and 2011, respectively. The gross excess tax benefits from stock-based compensation in the fiscal year ended December 31, 2013, 2012, and 2011 were $27.5 million, $17.0 million, and $30.0 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 2013, 2012, and 2011.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2013
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, 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		5,133			(179		)		(136		)		4,818

	Accumulated other comprehensive loss as of December 31, 2013		$	(2,879	)	$	63			$	(396	)		$	(3,212	)

	____________________


	(i)	Included in other income (expense), net on the consolidated income statements.
	(ii)	Included in operating expenses on the consolidated income statements.
	The Company did not have any other-than-temporary gain or loss reflected in accumulated other comprehensive loss as of December 31, 2013 and 2012.
	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, 2013
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 certain non-functional currency anticipated expenses for 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.
	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, 2013, 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 non-functional currency monetary liabilities.
	The notional amounts of these foreign exchange forward contracts in U.S. dollar equivalents were $30.1 million, and $23.6 million to buy as of December 31, 2013 and 2012, respectively.
	Balance Sheet Hedges
	Balance sheet hedges consist of cash flow hedge contracts that have been de-designated and non-designated hedge contracts. 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 $2.6 million and $2.7 million to buy at December 31, 2013 and 2012, respectively.
	The following table reflects the fair value amounts for the foreign exchange contracts designated and not designated as hedging instruments at December 31, 2013 and 2012 (in thousands):


		December 31, 2013						December 31, 2012
		Fair Value			Fair Value			Fair Value		Fair Value
		Derivative			Derivative			Derivative		Derivative
		Assets			Liabilities			Assets		Liabilities
		(i)			(ii)			(i)		(ii)
	Derivatives designated as hedging instruments	$	284		$	830		$	—	$	224

	Derivatives not designated as hedging instruments	—			194			—		184

	Total fair value of derivative instruments	$	284		$	1,024		$	—	$	408

	____________________

	(i)	Included in prepaid expenses and other current assets on the consolidated balance sheets.

	(ii)	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 or similar agreements with the respective counterparties of the foreign exchange contracts, subject to applicable requirements, the Company is allowed to net settle transactions of the same currency with a single net amount payable by one party to the other. The derivatives held by the Company are not subject to any credit contingent features negotiated with its counterparties nor is the Company required to post collateral against its derivative positions.
	As of December 31, 2012, there was no potential effect of rights of offset associated with the above foreign exchange contracts that would result in a net derivative asset or net derivative liability. As of December 31, 2013, information related to these offsetting arrangements was as follows (in thousands):

	Offsetting of Assets:


										Gross Amounts Not Offset
										in the Consolidated
										Balance Sheets
		Gross Amounts of			Gross Amounts Offset			Net Amounts of Assets		(i)			Cash		Net
		Recognized Assets			in the Consolidated			Presented		Financial			Collateral		Amount
					Balance Sheets			in the Consolidated		Instruments			Pledged
								Balance Sheets
	Foreign exchange contracts	$	284		$	—		$	284	$	(268	)	$	—	$	16

	____________________

	(i)	The balances at December 31, 2013 were related to derivative liabilities which are allowed to net settled against derivative assets in accordance with the master netting agreements.


	Offsetting of Liabilities:


										Gross Amounts Not Offset
										in the Consolidated
										Balance Sheets
		Gross Amounts of			Gross Amounts Offset			Net Amounts of Liabilities		(ii)					Net
		Recognized Liabilities			in the Consolidated			Presented		Financial			Cash		Amount
					Balance Sheets			in the Consolidated		Instruments			Collateral
								Balance Sheets					Pledged
	Foreign exchange contracts	$	1,024		$	—		$	1,024	$	(268	)	$	—	$	756

	____________________

	(ii)	The balances at December 31, 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 will include all changes in value that are effective including changes in time value to accumulated other comprehensive income. The Company will no longer record amounts as an excluded component of the hedge relationship.
The effects of derivative instruments designated as cash flow hedges on the accumulated other comprehensive loss and consolidated statements of income for the years ended December 31, 2013,2012, and 2011 are as follows (in thousands and not tax-effected):


	Years Ended December 31,
	2013			2012			2011
Amount of loss recognized in other comprehensive income (effective portion)	$	(2,089	)	$	(594	)	$	(4,037	)
Amount of loss reclassified from accumulated other comprehensive income to operating expenses (effective portion)	$	(1,869	)	$	(2,275	)	$	(2,395	)
Amount of gain recognized in income excluded from effectiveness testing located in operating expenses	$	728		$	1,227		$	161

The Company did not have any ineffective portion of the derivative recorded in the consolidated statements of income.
The gain recognized in other income (expense), net for non-designated foreign currency forward contracts for the years ended December 31, 2013, 2012, and 2011 is as follows (in thousands):


	Years Ended December 31,
	2013			2012			2011
Gain (loss) recognized in interest and other income (expense), net	$	(161	)	$	(904	)	$	2,296

See Note 2. Summary of Significant Accounting Policies and Note 9. Accumulated Other Comprehensive Loss of Notes to Consolidated Financial Statements for a further discussion.

Employee_401K_Plan

Employee 401(K) Plan	12 Months Ended
Employee 401(K) Plan	Dec. 31, 2013
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 $4.5 million, $3.6 million, and $2.7 million for the years ended December 31, 2013, 2012, and 2011 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, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	The federal, state, and foreign income tax provisions for the years ended December 31, 2013, 2012, and 2011 are summarized as follows (in thousands):


		Years Ended December 31,
		2013				2012				2011
	Current tax provision:
	Federal	$	65,344			$	35,481			$	38,179

	State	10,167				4,337				5,954

	Foreign	2,882				9,417				4,943

	Total current tax provision	78,393				49,235				49,076

	Deferred tax provision:
	Federal	(24,469		)		(3,044		)		3,119

	State	(3,334		)		597				(3,197		)

	Foreign	3,737				(2,203		)		135

	Total deferred tax provision	(24,066		)		(4,650		)		57

	Total provision for income taxes	$	54,327			$	44,585			$	49,133

	The components of income before income taxes attributable to domestic and foreign operations are as follows (in thousands):



		Years Ended December 31,
		2013				2012				2011
	Domestic	$	118,939			$	87,981			$	120,507

	Foreign	21,783				49,786				46,121

	Income before income taxes	$	140,722			$	137,767			$	166,628

	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,
		2013				2012				2011
	Income tax provision computed at federal statutory tax rate	$	49,253			$	48,218			$	58,320

	State taxes, net of federal benefit	2,249				1,402				2,231

	Foreign earnings taxed at different rates	1,550				(10,951		)		(9,328		)

	Stock-based compensation	3,397				3,270				571

	Return to provision true-up	(668		)		92				(131		)

	Research and development tax credits	(3,715		)		—				(3,023		)

	ASC 740-10 and other	(746		)		679				493

	Valuation allowance	3,007				1,875				—

	Total provision for income taxes	$	54,327			$	44,585			$	49,133

	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,
	2013				2012
Deferred tax assets:
Net operating loss carryforwards	$	23,710			$	33,095

Tax credits carryforwards	10,131				8,563

Deferred revenue	19,240				11,231

Reserves and accrued costs not currently deductible	15,097				12,325

Depreciable assets	6,450				11,003

Stock-based compensation	20,149				15,208

Other	381				—

Valuation allowance	(4,552		)		(20,179		)
Total deferred tax assets	90,606				71,246

Deferred tax liabilities:
Non-deductible intangible assets	(12,887		)		(25,435		)
Other	—				(897		)

Total deferred tax liabilities	(12,887		)		(26,332		)
Net deferred tax assets	$	77,719			$	44,914

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 2013, 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, 2013, it was considered more likely than not that our non-stock-based payments related deferred tax assets would be realized except for any increase to the deferred tax asset related to the California research and development credit. A valuation allowance of $3.5 million has been recorded against this portion of the credit, even though this tax attribute has an indefinite life. The valuation allowance decreased by $15.6 million in 2013, $4.9 million in 2012, and $6.6 million in 2011. The valuation allowance is primarily related to deferred tax assets that were created through the benefit from stock option deductions on a “with” and “without” basis and recorded on the balance sheet with a corresponding valuation allowance prior to the Company's adoption of ASC 718, Stock Compensation. Pursuant to ASC 718-740-25-10, the benefits of these deferred tax assets were recorded in the stockholders' equity when they were utilized on an income tax return to reduce the Company's taxes payable, and as such, they will not impact the Company's effective tax rate.

As of December 31, 2013, the Company had U.S. federal and state net operating loss carryforwards of approximately $57.3 million and $23.3 million, respectively. If not utilized, the federal and state net operating loss carryforwards will start to expire in 2014. The Company has state research and development tax credit carryforwards of approximately $19.4 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, 2013, the Company’s international subsidiaries had combined net operating loss carryforwards of $5.4 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 valuation allowance of $1.1 million relating to these net operating loss carryforwards.
The Company has not provided for U.S. federal and foreign withholding taxes on $103.4 million of undistributed earnings from its foreign subsidiaries as of December 31, 2013 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,
	2013				2012				2011
Beginning balance	$	21,079			$	16,298			$	12,400

Additions for tax positions of prior years	672				2,407				1,925

Reductions for tax positions of prior years	(668		)		(475		)		(569		)
Additions based on tax positions related to the current year	9,671				4,335				3,155

Reductions due to lapse of statute of limitations	(1,580		)		(1,486		)		(491		)
Reductions due to settlements	—				—				(122		)

Ending balance	$	29,174			$	21,079			$	16,298

The unrecognized tax benefits related to ASC 740-10, if recognized, would impact the income tax provision by $25.9 million, $18.9 million, and $15.3 million for the years ended December 31, 2013, 2012, and 2011, respectively. The unrecognized tax benefits were $29.2 million, $21.1 million, and $16.3 million as of December 31, 2013, 2012, and 2011, respectively. The Company has elected to include interest and penalties as a component of income tax expense. Accrued interest and penalties at December 31, 2013 and 2012 were approximately $3.2 million and $2.3 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, 2013, 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 2003 through 2011.
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, 2013
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, restricted stock units, and common shares potentially issuable under the terms of the Convertible Senior Notes, 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,
		2013		2012		2011
	Basic:
	Net income	$	86,395	$	93,182	$	117,495

	Weighted-average shares of common stock used to compute basic net income per share	108,146		107,874		103,956

	Net income per share-basic	$	0.8	$	0.86	$	1.13


	Diluted:
	Net income	$	86,395	$	93,182	$	117,495

	Effect of convertible senior notes, net of related tax effects	—		—		811

	Net income adjusted-diluted	$	86,395	$	93,182	$	118,306

	Weighted-average shares of common stock used to compute basic net income per share	108,146		107,874		103,956

	Effect of dilutive common stock equivalents:
	Dilutive effect of employee stock options	2,925		3,863		6,001

	Dilutive effect of unvested restricted stock units	323		352		522

	Dilutive effect of convertible senior notes	—		—		2,061

	Shares used in computing diluted net income per common share	111,394		112,089		112,540

	Net income per share-diluted	$	0.78	$	0.83	$	1.05

	Weighted average stock options and restricted stock units excluded from calculation due to anti-dilutive effect	5,666		3,844		1,273

	The diluted net income per common share calculation requires the dilutive effect of convertible securities to be reflected in the diluted net income per share by application of the “if-converted” method. This method assumes an add-back of interest and amortization of issuance cost, net of income taxes, to net income if the securities are converted. The Company determined that for year ended December 31, 2011, the Convertible Senior Notes had a dilutive effect on diluted net income per share, and as such, it had an add-back of $0.8 million in interest and issuance cost amortization, net of income taxes, to net income for the diluted net income per share calculation. The impact of the Notes for the year ended December 31, 2011 represents interest and issuance cost amortization until the redemption of the Notes on March 18, 2011.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2013
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 $16.3 million, $15.1 million, and $14.9 million in fiscal years 2013, 2012, and 2011, respectively.
	Future minimum lease payments as of December 31, 2013 under non-cancelable operating leases with original terms in excess of one year are summarized as follows (in thousands):


		Operating
		Leases
	2014	$	10,324

	2015	10,892

	2016	7,911

	2017	5,771

	2018	4,676

	Thereafter	9,336

	Total future minimum operating lease payments	$	48,910

	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, 2013 and 2012 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, 2013. 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
Litigation	Dec. 31, 2013
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
Related Party Transaction	Dec. 31, 2013
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, 2013, 2012, and 2011 were $1.9 million, $1.0 million, and $0.9 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, 2013
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 2013, 2012, and 2011. At December 31, 2013 and 2012, 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 32%, 35% and 34% of total revenues in 2013, 2012, and 2011, respectively.
	Total revenue by geographic region is summarized as follows (in thousands):


		Years Ended December 31,
		2013		2012		2011
	Revenues:
	North America	$	642,707	$	524,191	$	516,348

	Europe, the Middle East, and Africa	211,504		202,861		195,850

	Other	93,960		84,519		71,581

	Total revenues	$	948,171	$	811,571	$	783,779

	Property and equipment, net by geographic region is summarized as follows (in thousands):


		December 31,
		2013		2012
	Property and equipment, net:
	North America	$	147,460	$	135,388

	Europe, the Middle East, and Africa	4,907		3,395

	Other	4,941		6,691

	Total property and equipment, net	$	157,308	$	145,474

	The Company derives revenues from sales of software licenses, subscription-based licenses for a variety of cloud and address validation 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,
		2013		2012		2011
	Software revenues:
	License	$	367,074	$	320,982	$	353,664

	Subscription	46,664		29,193		18,565

	Total software revenues	413,738		350,175		372,229

	Service revenues:
	Maintenance	409,325		360,769		314,043

	Consulting and education	125,108		100,627		97,507

	Total service revenues	534,433		461,396		411,550

	Total revenues	$	948,171	$	811,571	$	783,779

Selected_Quarterly_Financial_I

Selected Quarterly Financial Information (Unaudited)	12 Months Ended
	Dec. 31, 2013
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,
		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




		Three Months Ended
		December 31,		September 30,		June 30,		March 31,
		2012		2012		2012		2012
		(In thousands, except per share data)
	Total revenues	$	234,741	$	190,318	$	190,492	$	196,020

	Gross profit	$	194,257	$	153,566	$	152,295	$	158,831

	Income from operations	$	44,601	$	25,139	$	28,202	$	38,017

	Net income	$	31,066	$	15,501	$	20,086	$	26,529

	Net income per common share:

	Basic	$	0.29	$	0.14	$	0.19	$	0.25

	Diluted	$	0.28	$	0.14	$	0.18	$	0.24

	Shares used in computing net income per common share:

	Basic	107,627		108,091		108,245		107,576

	Diluted	110,802		111,776		113,027		112,792

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
Acquisitions	'
	Acquisitions
	Acquisition in 2013:
	In February 2013, the Company acquired 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 was 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 escrow fund will remain in place until May 2014.
	Acquisition in 2012:
	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 at a price of 7.04 Euro per share in cash, or 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, for total cash consideration of approximately $108.7 million. The squeeze-out of the remaining shareholders was effective in the second quarter of 2013, increasing the Company's ownership of Heiler Software to 100 percent.
	The fair value of the noncontrolling interest in Heiler 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.
	Other Acquisitions in 2012
	In addition, during 2012 the Company acquired Data Scout Solutions Group Limited and TierData, Inc., both of which were privately-held companies, for an aggregate consideration of approximately $12.0 million in cash. Total assets acquired and liabilities assumed was approximately $15.0 million of which approximately $3.9 million was allocated to identifiable intangible assets, $3.9 million to net liabilities assumed, and $15.0 million was allocated to goodwill, which is partially deductible for tax purposes. Total acquiree transaction related costs and other liabilities was approximately $1.9 million, and include legal, accounting, and consulting fees as of the date of the acquisitions.
	Approximately $2.1 million of the consideration otherwise payable to former shareholders was held as partial security for certain indemnification obligations, and will be held back for payment until March 2014.
	At the time of these two acquisitions, the Company was obligated to pay up to an additional $6.0 million for certain variable and deferred earn-out payments based upon the achievement of certain performance targets. The Company determined the fair market value of these earn-outs based on probability analysis. The fair market value and gross amount of these earn-out payments were $4.9 million and $6.0 million, respectively. The fair value measurement is based on significant inputs not observed in the market and thus represents a Level 3 measurement, which reflects the Company's own assumptions in measuring fair value. The Company paid $1.8 million and $0.2 million in earn-out payments during the years ended December 31, 2013 and 2012, respectively. The fair value of the contingent consideration liability associated with these earn-outs was $3.1 million as of December 31, 2013.
	The Company’s business combinations completed in 2013 and 2012 did not have a material impact on the Company’s consolidated financial statements, and therefore pro forma disclosures have not been presented.

Schedule_II_Valuation_and_Qual

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2013
Valuation and Qualifying Accounts [Abstract]	'
Schedule II - Valuation and Qualifying Accounts	'
	Schedule II - Valuation and Qualifying Accounts
	(In thousands)



		Balance		Charged to			Acquisitions		Deductions			Balance
		at Beginning		Costs and								at End
	Description	of Period		Expenses								of Period
	Provision for Doubtful Accounts:
	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

	Year ended December 31, 2011	$	4,289	$	(31	)	$	33	$	(290	)	$	4,001

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Principles of Consolidation, Policy [Policy Text Block]	'
	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, Policy [Policy Text Block]	'
	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. 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, Policy [Policy Text Block]	'
	Reclassifications
	During the first quarter of 2013, the Company performed a review of the presentation of certain of its revenue categories and adopted a revised presentation, which the Company believes more accurately reflects its evolving product and service offerings. A change was made to rename other revenues to subscription revenues and present subscription revenues and license revenues as software revenues. Other revenues were previously presented in services revenues. A corresponding change was made to present cost of license revenues and cost of other revenues as cost of software revenues. This change in presentation did not affect total revenues, total cost of revenues or total gross margin. Conforming changes have been made for all prior periods presented.
Revenue Recognition, Policy [Policy Text Block]	'
	Revenue Recognition
	The Company derives its revenues from sales of software licenses, subscription-based licenses for a variety of cloud and address validation 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 No. 104 (“SAB 104”), 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 for address validation offerings, 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 address validation 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, Policy [Policy Text Block]	'
	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.
Investment, Policy [Policy Text Block]	'
	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 fiscal years 2013, 2012, and 2011, the Company did not consider any 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 fiscal years 2013, 2012, and 2011, the Company did not consider these investments to be other-than-temporarily impaired.
Receivables, Policy [Policy Text Block]	'
	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, Plant and Equipment, Policy [Policy Text Block]	'
	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 nine 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.
Research, Development, and Computer Software, Policy [Policy Text Block]	'
	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 Policy [Policy Text Block]	'
	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 Intangible Assets, Goodwill, Policy [Policy Text Block]	'
	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 fiscal 2013, 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, 2013, 2012, and 2011 and concluded that there was no impairment.
Impairment or Disposal of Long-Lived Intangible Assets, Impairment, Policy [Policy Text Block]	'
	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 of Financial Instruments, Policy [Policy Text Block]	'
	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 expectations 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 assets and liabilities, which include interest rates and credit risk. The Company 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, 2013 and 2012.
	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 our own assumptions in measuring fair value. There were no transfers into or out of the Level 3 category during the years ended December 31, 2013 and 2012. 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, 2013 consisted of the following (in thousands):


		December 31, 2013
	Beginning balance as of December 31, 2012	$	9,230

	Change in fair value of contingent consideration	(1,989		)
	Payment of contingent consideration	(4,170		)
	Ending balance as of December 31, 2013	$	3,071

	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 $4.1 million and $2.1 million at December 31, 2013 and 2012, 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.
Concentrations of Credit Risk and Credit Evaluations [Policy Text Block]	'
	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, Option and Incentive Plans Policy [Policy Text Block]	'
	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 employee stock options granted is derived from historical exercise patterns of the options, and the expected term of ESPP is based on the contractual terms. The expected term of options granted to employees is derived from the historical option exercises, post-vesting cancellations, and estimates concerning future exercises and cancellations for vested and unvested options that remain outstanding. The risk-free interest rate for the expected term of the option and ESPP is based on the U.S. Treasury yield curve in effect at the time of grant. The Company recognizes its stock-based compensation related to options using a straight-line method over the vesting term of the awards.
	The 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 2011, 2012 and 2013.
Shipping and Handling Cost, Policy [Policy Text Block]	'
	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 Costs, Policy [Policy Text Block]	'
	Advertising Expense
	Advertising costs are expensed as incurred.
Income Tax, Policy [Policy Text Block]	'
	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.
Segment Reporting, Policy [Policy Text Block]	'
	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.
New Accounting Pronouncements, Policy [Policy Text Block]	'
	Recent Accounting Pronouncements
	In December 2011, the FASB issued Accounting Standard Update ("ASU") No. 2011-11, Balance Sheet (Topic 210) - Disclosures about Offsetting Assets and Liabilities. ASU 2011-11 requires an entity to disclose additional information about offsetting and related arrangements to enable users of the financial statements to understand the effect of those arrangements on the financial position. In January 2013, the FASB issued ASU No. 2013-01, Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities, which clarifies that the scope of ASU 2011-11 applies to derivatives accounted for in accordance with Topic 815, Derivatives and Hedging, including bifurcated embedded derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and securities lending transactions that are either offset or subject to an enforceable master netting arrangement. The Company adopted both standards as required on January 1, 2013 and adoption did not impact the Company's consolidated financial statements.
	In February 2013, the FASB issued ASU 2013-02, Comprehensive Income (Topic 220) - Reporting of Amounts Reclassified Out Of Accumulated Other Comprehensive Income. ASU 2013-02 requires an entity to present, either on the face of its statement where net income is presented or in a note, the effect of significant reclassifications out of accumulated other comprehensive income if the amount being reclassified is required under GAAP to be reclassified in its entirety to net income. For amounts that are not required under GAAP to be reclassified in their entirety to net income in the same reporting period, an entity is required to cross-reference to other related disclosures that provide additional detail. The Company adopted ASU 2013-02 prospectively as required on January 1, 2013 by electing to present the required information in a single footnote. Adoption of this new amended guidance did not have a material impact on the Company's disclosures to its financial statements.
	In March 2013, the FASB issued 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. ASU 2013-05 will be effective for the Company in 2014, which will be applied prospectively. The Company does not expect its adoption of ASU 2013-05 to have a material impact on its 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 guidance will be effective prospectively for reporting periods beginning after December 15, 2013. The Company does not expect its adoption of ASU 2013-11 to have a material impact on its consolidated financial statements or disclosures.
Derivatives, Offsetting Fair Value Amounts, Policy [Policy Text Block]	'
	The Company presents its derivative assets and derivative liabilities at gross fair values in the consolidated balance sheets. However, under the master netting arrangements or similar agreements with the respective counterparties of the foreign exchange contracts, subject to applicable requirements, the Company is allowed to net settle transactions of the same currency with a single net amount payable by one party to the other. The derivatives held by the Company are not subject to any credit contingent features negotiated with its counterparties nor is the Company required to post collateral against its derivative positions.
Derivatives, Methods of Accounting, Hedge Effectiveness [Policy Text Block]	'
	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 will include all changes in value that are effective including changes in time value to accumulated other comprehensive income. The Company will no longer record amounts as an excluded component of the hedge relationship.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block]	'
	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		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)	$	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

	The following table summarizes financial assets and financial liabilities that the Company measures at fair value on a recurring basis as of December 31, 2012 (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)	$	18,565		$	18,565	$	—	$	—

	Time deposits (ii)	17,437			17,437		—		—

	Marketable debt securities (ii)	328,041			—		328,041		—

	Total assets	$	364,043		$	36,002	$	328,041	$	—

	Liabilities:

	Foreign currency derivatives (iv)	$	408		$	—	$	408	$	—

	Acquisition-related contingent consideration (v)	9,230			—		—		9,230

	Total liabilities	$	9,638		$	—	$	408	$	9,230

	___________________

	(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 [Table Text Block]	'
	The changes in the acquisition-related contingent consideration liability for the year ended December 31, 2013 consisted of the following (in thousands):


		December 31, 2013
	Beginning balance as of December 31, 2012	$	9,230

	Change in fair value of contingent consideration	(1,989		)
	Payment of contingent consideration	(4,170		)
	Ending balance as of December 31, 2013	$	3,071

Cash_Cash_Equivalents_and_Shor1

Cash, Cash Equivalents, and Short-Term Investments (Tables)	12 Months Ended
	Dec. 31, 2013
Cash, Cash Equivalents, and Short-term Investments [Abstract]	'
Schedule of Cash, Cash Equivalents and Short-term Investments [Table Text Block]	'
	The following table summarizes the Company’s cash, cash equivalents, and short-term investments as of 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 (i)	$	677,333		$	404			$	(303	)		$	677,434

	The following table summarizes the Company’s cash, cash equivalents, and short-term investments as of December 31, 2012 (in thousands):


					Gross				Gross				Estimated
		Cost			Unrealized				Unrealized				Fair Value
					Gains				Losses
	Cash	$	171,562		$	—			$	—			$	171,562

	Cash equivalents:

	Money market funds	18,565			—				—				18,565

	Total cash equivalents	18,565			—				—				18,565

	Total cash and cash equivalents	190,127			—				—				190,127

	Short-term investments:

	Certificates of deposit	2,246			3				—				2,249

	Commercial paper	6,294			—				—				6,294

	Corporate notes and bonds	151,133			322				(56		)		151,399

	Federal agency notes and bonds	104,961			128				(10		)		105,079

	Time deposits	17,437			—				—				17,437

U.S. government notes and bonds	7,094			18				—				7,112

Municipal notes and bonds	55,922			18				(32		)		55,908

Total short-term investments	345,087			489				(98		)		345,478

Total cash, cash equivalents, and short-term investments (i)	$	535,214		$	489			$	(98	)		$	535,605

____________________

(i)	Total estimated fair value above included $413.9 million and $364.0 million comprised of cash equivalents and short-term investments at December 31, 2013 and 2012, respectively.
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]	'
	The following table summarizes the fair value and gross unrealized losses related to the Company's short-term investments, aggregated by investment category that have been in a continuous unrealized loss position for less than twelve months, at December 31, 2013 (in thousands):


		Less Than 12 months
					Gross
		Fair Value			Unrealized
					Losses
	Corporate notes and bonds	$	73,860		$	(220	)

	Federal agency notes and bonds	41,260			(69		)

	Municipal notes and bonds	22,816			(14		)

	Total	$	137,936		$	(303	)

Investments Classified by Contractual Maturity Date [Table Text Block]	'
	The following table summarizes the cost and estimated fair value of the Company’s short-term investments by contractual maturity at December 31, 2013 (in thousands):


		Cost			Fair Value
	Due within one year	$	149,626		$	149,680

	Due in one year to two years	139,428			139,637

	Due after two years	90,461			90,299

	Total	$	379,515		$	379,616

Property_and_Equipment_Tables

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Property, Plant and Equipment [Table Text Block]	'
	The following table summarizes the cost of property and equipment and related accumulated depreciation at December 31, 2013 and 2012 (in thousands):


		Estimated	December 31,
		Useful Lives	2013			2012
	Land	N/A	$	20,637		$	20,637

	Buildings	25 years	105,725			105,725

	Site improvements	15 years	1,199			1,162

	Building improvements	10-15 years	11,246			161

	Total land and buildings		138,807			127,685

	Computer and equipment	1-5 years	62,423			55,568

	Furniture and fixtures	3-5 years	8,287			6,849

	Leasehold improvements	1-9 years	14,454			24,530

	Total property and equipment		223,971			214,632

	Less: Accumulated depreciation and amortization		(66,663		)	(69,158		)
	Total property and equipment, net		$	157,308		$	145,474

Intangible_Assets_and_Goodwill1

Intangible Assets and Goodwill (Tables)	12 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Schedule of Finite-Lived and Acquired Indefinite-Lived Intangible Assets by Major Class [Table Text Block]	'
	The carrying amounts of the intangible assets other than goodwill as of December 31, 2013 and 2012 are as follows (in thousands, except years):


		December 31, 2013							December 31, 2012							Weighted
																Average
																Useful Life
		Cost		Accumulated			Net		Cost		Accumulated			Net		(Years)
				Amortization							Amortization
	Developed and core technology	$	130,744	$	(99,026	)	$	31,718	$	123,221	$	(76,721	)	$	46,500	6

	Other intangible assets:
	Customer relationships	41,683		(35,216		)	6,467		40,952		(30,063		)	10,889		6

	All other (1)	17,205		(13,765		)	3,440		17,208		(11,187		)	6,021		11-Apr

	Total other intangible assets	58,888		(48,981		)	9,907		58,160		(41,250		)	16,910

	Total intangible assets subject to amortization	189,632		(148,007		)	41,625		181,381		(117,971		)	63,410

	In-process research and development	—		—			—		3,850		—			3,850		N.A.

	Total intangible assets, net	$	189,632	$	(148,007	)	$	41,625	$	185,231	$	(117,971	)	$	67,260

	____________________

	(i)	All other includes vendor relationships, trade names, covenants not to compete, and patents.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	'
	As of December 31, 2013, 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
	2014	$	13,017	$	4,730		$	17,747

	2015	8,611		2,097			10,708

	2016	5,082		1,299			6,381

	2017	3,163		863			4,026

	2018	1,395		439			1,834

	Thereafter	450		479			929

	Total intangible assets subject to amortization	$	31,718	$	9,907		$	41,625

Schedule of Goodwill [Table Text Block]	'
	The changes in the carrying amount of goodwill for the years ended December 31, 2013 and 2012 are as follows (in thousands):


		December 31,
		2013		2012
	Beginning balance	$	510,121	$	432,269

	Goodwill from acquisitions	7,110		76,669

	Subsequent goodwill adjustments	5,911		1,183

	Ending balance	$	523,142	$	510,121

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	'
	The fair value of the Company's stock-based awards was estimated based on the following assumptions:


		Years Ended December 31,
		2013				2012				2011
	Option grants:
	Expected volatility	41 - 43		%		39 - 48		%		35 - 43		%

	Weighted-average volatility	41		%		44		%		36		%

	Expected dividends	—				—				—

	Expected term of options (in years)	3.3				3.3				3.8

	Risk-free interest rate	0.7		%		0.5		%		1.5		%

	ESPP:
	Expected volatility	37 - 42		%		43 - 53		%		35 - 38		%

	Weighted-average volatility	40		%		49		%		36		%

	Expected dividends	—				—				—

	Expected term of ESPP (in years)	0.5				0.5				0.5

	Risk-free interest rate	0.1		%		0.1		%		0.2		%

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]	'
	The allocation of the stock-based compensation, net of estimated income tax benefit, is as follows (in thousands):



		Years Ended December 31,
		2013				2012				2011
	Cost of service revenues	$	5,525			$	4,349			$	3,539

	Research and development	19,002				14,919				10,848

	Sales and marketing	19,323				13,518				10,185

	General and administrative	13,354				10,017				8,691

	Total stock-based compensation	57,204				42,803				33,263

	Estimated tax benefit of stock-based compensation	(15,934		)		(10,994		)		(8,490		)
	Total stock-based compensation, net of tax benefit	$	41,270			$	31,809			$	24,773

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]	'
	A summary of stock option activity through December 31, 2013 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, 2010	12,361			$	14.73			3.87		$	362,236

	Granted	1,339			48.28

	Exercised	(3,245	)		13.38

	Forfeited or expired	(226	)		22.76

	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

	Exercisable at December 31, 2013	6,095			$	24.34			2.32		$	111,562

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]	'
	The following table summarizes information about stock options as of December 31, 2013 (number of options in thousands):



			Options Outstanding									Options Exercisable
			Number			Weighted-Average		Weighted				Number	Weighted
	Range of		of			Remaining		Average				of	Average
	Exercise Prices		Options			Contractual Life		Exercise Price				Options	Exercise Price
						(Years)		Per Share					Per Share
	$4.23 to $13.14		1,611			0.6		$	6.85			1,611	$	6.85

	$13.86 to $24.38		2,092			1.65		$	19.22			2,067	$	19.16

	$25.46 to $37.43		2,867			5.42		$	33.15			899	$	30.96

	$38.11 to $44.06		1,798			5.04		$	42.51			744	$	43.52

	$46.63 to $54.93		996			3.52		$	47.87			714	$	47.74

	$56.27 to $56.27		60			4.4		$	56.27			60	$	56.27

			9,424			3.48		$	29.05			6,095	$	24.34

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]	'
	The Company started granting RSUs in 2009. A summary of RSU activity through December 31, 2013 is presented below (in thousands, except per share amounts):


					Weighted-
					Average
		Number of			Grant Date
		Shares			Fair Value
	Outstanding at December 31, 2010	1,405

	Awarded	733			$	50

	Released	(407	)		$	50.55

	Forfeited	-120			$	29

	Outstanding at December 31, 2011	1,611

	Awarded	1,095			$	40.13

	Released	-535			$	42.16

	Forfeited	-244			$	39.3

	Outstanding at December 31, 2012	1,927

	Awarded	835			$	35.5

	Released	-711			$	35.74

	Forfeited	-258			$	39.91

	Outstanding at December 31, 2013	1,793

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]	'
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	'
	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		5,133			(179		)		(136		)		4,818

	Accumulated other comprehensive loss as of December 31, 2013		$	(2,879	)	$	63			$	(396	)		$	(3,212	)

	____________________


	(i)	Included in other income (expense), net on the consolidated income statements.
	(ii)	Included in operating expenses on the consolidated income statements.

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	'
	The following table reflects the fair value amounts for the foreign exchange contracts designated and not designated as hedging instruments at December 31, 2013 and 2012 (in thousands):


		December 31, 2013						December 31, 2012
		Fair Value			Fair Value			Fair Value			Fair Value
		Derivative			Derivative			Derivative			Derivative
		Assets			Liabilities			Assets			Liabilities
		(i)			(ii)			(i)			(ii)
	Derivatives designated as hedging instruments	$	284		$	830		$	—		$	224

	Derivatives not designated as hedging instruments	—			194			—			184

	Total fair value of derivative instruments	$	284		$	1,024		$	—		$	408

	____________________

	(i)	Included in prepaid expenses and other current assets on the consolidated balance sheets.

	(ii)	Included in accrued liabilities on the consolidated balance sheets.
Offsetting Assets [Table Text Block]	'
	As of December 31, 2012, there was no potential effect of rights of offset associated with the above foreign exchange contracts that would result in a net derivative asset or net derivative liability. As of December 31, 2013, information related to these offsetting arrangements was as follows (in thousands):

	Offsetting of Assets:


											Gross Amounts Not Offset
											in the Consolidated
											Balance Sheets
		Gross Amounts of			Gross Amounts Offset			Net Amounts of Assets			(i)			Cash		Net
		Recognized Assets			in the Consolidated			Presented			Financial			Collateral		Amount
					Balance Sheets			in the Consolidated			Instruments			Pledged
								Balance Sheets
	Foreign exchange contracts	$	284		$	—		$	284		$	(268	)	$	—	$	16

	____________________

	(i)	The balances at December 31, 2013 were related to derivative liabilities which are allowed to net settled against derivative assets in accordance with the master netting agreements.
Offsetting Liabilities [Table Text Block]	'
	Offsetting of Liabilities:


											Gross Amounts Not Offset
											in the Consolidated
											Balance Sheets
		Gross Amounts of			Gross Amounts Offset			Net Amounts of Liabilities			(ii)					Net
		Recognized Liabilities			in the Consolidated			Presented			Financial			Cash		Amount
					Balance Sheets			in the Consolidated			Instruments			Collateral
								Balance Sheets						Pledged
	Foreign exchange contracts	$	1,024		$	—		$	1,024		$	(268	)	$	—	$	756

	____________________

	(ii)	The balances at December 31, 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 [Table Text Block]	'
	The effects of derivative instruments designated as cash flow hedges on the accumulated other comprehensive loss and consolidated statements of income for the years ended December 31, 2013,2012, and 2011 are as follows (in thousands and not tax-effected):


		Years Ended December 31,
		2013			2012			2011
	Amount of loss recognized in other comprehensive income (effective portion)	$	(2,089	)	$	(594	)	$	(4,037	)
	Amount of loss reclassified from accumulated other comprehensive income to operating expenses (effective portion)	$	(1,869	)	$	(2,275	)	$	(2,395	)
	Amount of gain recognized in income excluded from effectiveness testing located in operating expenses	$	728		$	1,227		$	161

	The Company did not have any ineffective portion of the derivative recorded in the consolidated statements of income.
	The gain recognized in other income (expense), net for non-designated foreign currency forward contracts for the years ended December 31, 2013, 2012, and 2011 is as follows (in thousands):


		Years Ended December 31,
		2013			2012			2011
	Gain (loss) recognized in interest and other income (expense), net	$	(161	)	$	(904	)	$	2,296

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	'
	The federal, state, and foreign income tax provisions for the years ended December 31, 2013, 2012, and 2011 are summarized as follows (in thousands):


		Years Ended December 31,
		2013			2012			2011
	Current tax provision:
	Federal	$	65,344		$	35,481		$	38,179

	State	10,167			4,337			5,954

	Foreign	2,882			9,417			4,943

	Total current tax provision	78,393			49,235			49,076

	Deferred tax provision:
	Federal	(24,469		)	(3,044		)	3,119

	State	(3,334		)	597			(3,197		)

	Foreign	3,737			(2,203		)	135

	Total deferred tax provision	(24,066		)	(4,650		)	57

	Total provision for income taxes	$	54,327		$	44,585		$	49,133

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]	'
	The components of income before income taxes attributable to domestic and foreign operations are as follows (in thousands):



		Years Ended December 31,
		2013			2012			2011
	Domestic	$	118,939		$	87,981		$	120,507

	Foreign	21,783			49,786			46,121

	Income before income taxes	$	140,722		$	137,767		$	166,628

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	'
	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,
		2013			2012			2011
	Income tax provision computed at federal statutory tax rate	$	49,253		$	48,218		$	58,320

	State taxes, net of federal benefit	2,249			1,402			2,231

	Foreign earnings taxed at different rates	1,550			(10,951		)	(9,328		)

	Stock-based compensation	3,397			3,270			571

	Return to provision true-up	(668		)	92			(131		)

	Research and development tax credits	(3,715		)	—			(3,023		)

	ASC 740-10 and other	(746		)	679			493

	Valuation allowance	3,007			1,875			—

	Total provision for income taxes	$	54,327		$	44,585		$	49,133

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	'
	Significant components of the Company's deferred tax assets are as follows (in thousands):


		December 31,
		2013			2012
	Deferred tax assets:
	Net operating loss carryforwards	$	23,710		$	33,095

	Tax credits carryforwards	10,131			8,563

	Deferred revenue	19,240			11,231

	Reserves and accrued costs not currently deductible	15,097			12,325

	Depreciable assets	6,450			11,003

	Stock-based compensation	20,149			15,208

	Other	381			—

	Valuation allowance	(4,552		)	(20,179		)
	Total deferred tax assets	90,606			71,246

	Deferred tax liabilities:
	Non-deductible intangible assets	(12,887		)	(25,435		)
	Other	—			(897		)

	Total deferred tax liabilities	(12,887		)	(26,332		)
	Net deferred tax assets	$	77,719		$	44,914

Summary of Income Tax Contingencies [Table Text Block]	'
	A reconciliation of the beginning and ending amount of the unrecognized tax benefits is as follows (in thousands):


		December 31,
		2013			2012			2011
	Beginning balance	$	21,079		$	16,298		$	12,400

	Additions for tax positions of prior years	672			2,407			1,925

	Reductions for tax positions of prior years	(668		)	(475		)	(569		)
	Additions based on tax positions related to the current year	9,671			4,335			3,155

	Reductions due to lapse of statute of limitations	(1,580		)	(1,486		)	(491		)
	Reductions due to settlements	—			—			(122		)

	Ending balance	$	29,174		$	21,079		$	16,298

Net_Income_per_Common_Share_Ta

Net Income per Common Share (Tables)	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]	'
	The calculation of basic and diluted net income per share is as follows (in thousands, except per share amounts):


		Years Ended December 31,
		2013		2012		2011
	Basic:
	Net income	$	86,395	$	93,182	$	117,495

	Weighted-average shares of common stock used to compute basic net income per share	108,146		107,874		103,956

	Net income per share-basic	$	0.8	$	0.86	$	1.13


	Diluted:
	Net income	$	86,395	$	93,182	$	117,495

	Effect of convertible senior notes, net of related tax effects	—		—		811

	Net income adjusted-diluted	$	86,395	$	93,182	$	118,306

	Weighted-average shares of common stock used to compute basic net income per share	108,146		107,874		103,956

	Effect of dilutive common stock equivalents:
	Dilutive effect of employee stock options	2,925		3,863		6,001

	Dilutive effect of unvested restricted stock units	323		352		522

	Dilutive effect of convertible senior notes	—		—		2,061

	Shares used in computing diluted net income per common share	111,394		112,089		112,540

	Net income per share-diluted	$	0.78	$	0.83	$	1.05

	Weighted average stock options and restricted stock units excluded from calculation due to anti-dilutive effect	5,666		3,844		1,273

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	'
	Future minimum lease payments as of December 31, 2013 under non-cancelable operating leases with original terms in excess of one year are summarized as follows (in thousands):


		Operating
		Leases
	2014	$	10,324

	2015	10,892

	2016	7,911

	2017	5,771

	2018	4,676

	Thereafter	9,336

	Total future minimum operating lease payments	$	48,910

Significant_Customer_Informati1

Significant Customer Information and Segment Information (Tables)	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]	'
	Total revenue by geographic region is summarized as follows (in thousands):


		Years Ended December 31,
		2013		2012		2011
	Revenues:
	North America	$	642,707	$	524,191	$	516,348

	Europe, the Middle East, and Africa	211,504		202,861		195,850

	Other	93,960		84,519		71,581

	Total revenues	$	948,171	$	811,571	$	783,779

	Property and equipment, net by geographic region is summarized as follows (in thousands):


		December 31,
		2013		2012
	Property and equipment, net:
	North America	$	147,460	$	135,388

	Europe, the Middle East, and Africa	4,907		3,395

	Other	4,941		6,691

	Total property and equipment, net	$	157,308	$	145,474

	The Company derives revenues from sales of software licenses, subscription-based licenses for a variety of cloud and address validation 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,
		2013		2012		2011
	Software revenues:
	License	$	367,074	$	320,982	$	353,664

	Subscription	46,664		29,193		18,565

	Total software revenues	413,738		350,175		372,229

	Service revenues:
	Maintenance	409,325		360,769		314,043

	Consulting and education	125,108		100,627		97,507

	Total service revenues	534,433		461,396		411,550

	Total revenues	$	948,171	$	811,571	$	783,779

Selected_Quarterly_Financial_I1

Selected Quarterly Financial Information (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Schedule of Quarterly Financial Information [Table Text Block]	'


		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




		Three Months Ended
		December 31,		September 30,		June 30,		March 31,
		2012		2012		2012		2012
		(In thousands, except per share data)
	Total revenues	$	234,741	$	190,318	$	190,492	$	196,020

	Gross profit	$	194,257	$	153,566	$	152,295	$	158,831

	Income from operations	$	44,601	$	25,139	$	28,202	$	38,017

	Net income	$	31,066	$	15,501	$	20,086	$	26,529

	Net income per common share:

	Basic	$	0.29	$	0.14	$	0.19	$	0.25

	Diluted	$	0.28	$	0.14	$	0.18	$	0.24

	Shares used in computing net income per common share:

	Basic	107,627		108,091		108,245		107,576

	Diluted	110,802		111,776		113,027		112,792

Acquisitions_Tables

Acquisitions (Tables) (Heiler Software AG [Member])	12 Months Ended
	Dec. 31, 2013
Heiler Software AG [Member]	'
Business Acquisition [Line Items]	'
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	'
	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 (Reclassifications of Subscription Revenues and Cost of Subscription Revenues) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]	'	'	'
Subscription Revenues	$46,664,000	$29,193,000	$18,565,000
Cost of Subscription Revenues	'	$3,400,000	$3,100,000

Summary_of_Significant_Account4

Summary of Significant Accounting Policies (Significant Accounting Policies) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	reporting_segment	reporting_segment	reporting_segment
Summary of Significant Accounting Policies [Line Items]	'	'	'
Allowance for Doubtful Accounts Receivable, Current	$4,135,000	$5,460,000	'
Other than Temporary Impairment Losses, Investments	0	0	0
Goodwill and intangible asset impairment	0	0	0
Tangible asset impairment	0	0	0
Maintenance Revenue Contract, Term	'1 year	'	'
Reporting Segment Number	1	1	1
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	'	'
Land 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	'9 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	'	$2,400,000	'

Summary_of_Significant_Account5

Summary of Significant Accounting Policies (Financial Assets and Liabilities at Fair Vaue) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Fair Value, Assets and Liabilities, Recurring Basis [Abstract]	'		'
Cash and Cash Equivalents, Estimated Fair Value	$297,818,000		$190,127,000
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	43,478,000		36,002,000
Foreign currency derivatives	0	[1]	0	[1]
Assets, Fair Value Disclosure, Recurring	43,478,000		36,002,000
Foreign currency derivatives	0	[2]	0	[2]
Business Combination, Contingent Consideration, Liability	0	[2]	0	[3]
Liabilities, Fair Value Disclosure, Recurring	0		0
Stable Net Asset Value Per Share of Money Market Fund and Time Deposits	$1		$1
Fair Value, Measurements, Recurring [Member] \| Estimate of Fair Value Measurement [Member]	'		'
Fair Value, Assets and Liabilities, Recurring Basis [Abstract]	'		'
Total Cash Equivalents and Short-term Investments	413,862,000		364,043,000
Foreign currency derivatives	284,000	[1]	0	[1]
Assets, Fair Value Disclosure, Recurring	414,146,000		364,043,000
Foreign currency derivatives	1,024,000	[2]	408,000	[2]
Business Combination, Contingent Consideration, Liability	3,071,000	[2]	9,230,000	[3]
Liabilities, Fair Value Disclosure, Recurring	4,095,000		9,638,000
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	370,384,000		328,041,000
Foreign currency derivatives	284,000	[1]	0	[1]
Assets, Fair Value Disclosure, Recurring	370,668,000		328,041,000
Foreign currency derivatives	1,024,000	[2]	408,000	[2]
Business Combination, Contingent Consideration, Liability	0	[2]	0	[3]
Liabilities, Fair Value Disclosure, Recurring	1,024,000		408,000
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	[2]
Business Combination, Contingent Consideration, Liability	3,071,000	[2]	9,230,000	[3]
Liabilities, Fair Value Disclosure, Recurring	3,071,000		9,230,000
Time Deposits [Member]	'		'
Fair Value, Assets and Liabilities, Recurring Basis [Abstract]	'		'
Other Short-Term Investments, Estimated Fair Value	21,585,000		17,437,000
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	21,585,000	[4]	17,437,000	[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	21,585,000	[4]	17,437,000	[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]
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] \| Estimate of Fair Value Measurement [Member]	'		'
Fair Value, Assets and Liabilities, Recurring Basis [Abstract]	'		'
Marketable Debt Securities, Fair Value Disclosure	370,384,000	[4]	328,041,000	[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	370,384,000	[4]	328,041,000	[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]
Money Market Funds [Member]	'		'
Fair Value, Assets and Liabilities, Recurring Basis [Abstract]	'		'
Cash and Cash Equivalents, Estimated Fair Value	21,893,000		18,565,000
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	21,893,000	[5]	18,565,000	[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	21,893,000	[5]	18,565,000	[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]

[1]	Included in prepaid expenses and other current assets on the consolidated balance sheets.
[2]	Included in accrued liabilities on the consolidated balance sheets.
[3]	Included in accrued and other 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_Account6

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, 2013
Foreign Exchange Forward [Member] \| Cash Flow Hedging [Member]	'
Derivative [Line Items]	'
Maximum Remaining Maturity of Foreign Currency Derivatives	'13 months

Summary_of_Significant_Account7

Summary of Significant Accounting Policies (Change in Acquisition-Related Contingent Consideration Liability) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Business Acquisition, Contingent Consideration [Line Items]	'		'	'
Payment of contingent consideration	($4,170)		($8,050)	($1,000)
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]	'		'	'
Business Acquisition, Contingent Consideration [Line Items]	'		'	'
Beginning balance as of December 31, 2012	9,230	[1]	'	'
Change in fair value of contingent consideration	-1,989		'	'
Payment of contingent consideration	-4,170		'	'
Ending balance as of December 31, 2013	$3,071	[2]	'	'

[1]	Included in accrued and other liabilities on the consolidated balance sheets.
[2]	Included in accrued liabilities on the consolidated balance sheets.

Summary_of_Significant_Account8

Summary of Significant Accounting Policies (Cost Method Investments) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]	'	'
Cost Method Investments	$4.10	$2.10

Cash_Cash_Equivalents_and_Shor2

Cash, Cash Equivalents, and Short-Term Investments (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2010
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]	'	'		'		'
Available-for-sale Securities, Gross Realized Gain	$300,000	'		'		'
Cash, Cash Equivalents, and Short-Term Investments [Abstract]	'	'		'		'
Cash and cash equivalents, at cost	316,835,000	297,818,000		190,127,000		208,899,000
Short-Term Investments Total Amortized Cost	'	379,515,000		345,087,000		'
Total Cash, Cash Equivalents, and Short-Term Investments Cost Basis	'	677,333,000		535,214,000		'
Available-for-sale Securities, Gross Unrealized Gains	'	404,000		489,000		'
Available-for-sale Securities, Gross Unrealized Losses	'	-303,000		-98,000		'
Cash and Cash Equivalents, Estimated Fair Value	'	297,818,000		190,127,000		'
Total Short-term Investments, Fair Value Disclosure	'	379,616,000		345,478,000		'
Total Cash, Cash Equivalents, and Short-term Investments, Estimated Fair Value	'	677,434,000	[1]	535,605,000	[1]	'
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]	'	'		'		'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	'	137,936,000		'		'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Accumulated in Investments	'	-303,000		'		'
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	'	0		'		'
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	'	0		'		'
Certificates of Deposit [Member]	'	'		'		'
Cash, Cash Equivalents, and Short-Term Investments [Abstract]	'	'		'		'
Available-for-sale Securities, Amortized Cost Basis	'	960,000		2,246,000		'
Available-for-sale Securities, Gross Unrealized Gains	'	0		3,000		'
Available-for-sale Securities, Gross Unrealized Losses	'	0		0		'
Available-for-sale Securities, Estimated Fair Value	'	960,000		2,249,000		'
Commercial Paper, not Included with Cash and Cash Equivalents [Member]	'	'		'		'
Cash, Cash Equivalents, and Short-Term Investments [Abstract]	'	'		'		'
Available-for-sale Securities, Amortized Cost Basis	'	12,738,000		6,294,000		'
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	'	12,738,000		6,294,000		'
Corporate Notes and Bonds [Member]	'	'		'		'
Cash, Cash Equivalents, and Short-Term Investments [Abstract]	'	'		'		'
Available-for-sale Securities, Amortized Cost Basis	'	175,446,000		151,133,000		'
Available-for-sale Securities, Gross Unrealized Gains	'	220,000		322,000		'
Available-for-sale Securities, Gross Unrealized Losses	'	-220,000		-56,000		'
Available-for-sale Securities, Estimated Fair Value	'	175,446,000		151,399,000		'
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]	'	'		'		'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	'	73,860,000		'		'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Accumulated in Investments	'	-220,000		'		'
Federal Agency Notes and Bonds [Member]	'	'		'		'
Cash, Cash Equivalents, and Short-Term Investments [Abstract]	'	'		'		'
Available-for-sale Securities, Amortized Cost Basis	'	64,863,000		104,961,000		'
Available-for-sale Securities, Gross Unrealized Gains	'	31,000		128,000		'
Available-for-sale Securities, Gross Unrealized Losses	'	-69,000		-10,000		'
Available-for-sale Securities, Estimated Fair Value	'	64,825,000		105,079,000		'
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]	'	'		'		'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	'	41,260,000		'		'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Accumulated in Investments	'	-69,000		'		'
Time Deposits [Member]	'	'		'		'
Cash, Cash Equivalents, and Short-Term Investments [Abstract]	'	'		'		'
Other Short-Term Investments, Cost Basis	'	21,585,000		17,437,000		'
Other Short-Term Investments, Estimated Fair Value	'	21,585,000		17,437,000		'
U.S. Government Notes and Bonds [Member]	'	'		'		'
Cash, Cash Equivalents, and Short-Term Investments [Abstract]	'	'		'		'
Available-for-sale Securities, Amortized Cost Basis	'	0		7,094,000		'
Available-for-sale Securities, Gross Unrealized Gains	'	0		18,000		'
Available-for-sale Securities, Gross Unrealized Losses	'	0		0		'
Available-for-sale Securities, Estimated Fair Value	'	0		7,112,000		'
Municipal Notes and Bonds [Member]	'	'		'		'
Cash, Cash Equivalents, and Short-Term Investments [Abstract]	'	'		'		'
Available-for-sale Securities, Amortized Cost Basis	'	103,923,000		55,922,000		'
Available-for-sale Securities, Gross Unrealized Gains	'	153,000		18,000		'
Available-for-sale Securities, Gross Unrealized Losses	'	-14,000		-32,000		'
Available-for-sale Securities, Estimated Fair Value	'	104,062,000		55,908,000		'
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]	'	'		'		'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	'	22,816,000		'		'
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Accumulated in Investments	'	-14,000		'		'
Cash [Member]	'	'		'		'
Cash, Cash Equivalents, and Short-Term Investments [Abstract]	'	'		'		'
Cash and cash equivalents, at cost	'	263,572,000		171,562,000		'
Cash and Cash Equivalents, Estimated Fair Value	'	263,572,000		171,562,000		'
Cash Equivalents [Member]	'	'		'		'
Cash, Cash Equivalents, and Short-Term Investments [Abstract]	'	'		'		'
Cash and cash equivalents, at cost	'	34,246,000		18,565,000		'
Cash and Cash Equivalents, Estimated Fair Value	'	34,246,000		18,565,000		'
Money Market Funds [Member]	'	'		'		'
Cash, Cash Equivalents, and Short-Term Investments [Abstract]	'	'		'		'
Cash and cash equivalents, at cost	'	21,893,000		18,565,000		'
Cash and Cash Equivalents, Estimated Fair Value	'	21,893,000		18,565,000		'
US Treasury and Government [Member]	'	'		'		'
Cash, Cash Equivalents, and Short-Term Investments [Abstract]	'	'		'		'
Cash and cash equivalents, at cost	'	12,353,000		0		'
Cash and Cash Equivalents, Estimated Fair Value	'	$12,353,000		$0		'

[1]	Total estimated fair value above included $413.9 million and $364.0 million comprised of cash equivalents and short-term investments at December 31, 2013 and 2012, respectively.

Cash_Cash_Equivalents_and_Shor3

Cash, Cash Equivalents, and Short-Term Investments (Short-Term Investments Maturities) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]	'	'
Short-Term Investments, Maturities, Due within One Year, Cost Basis	$149,626	'
Available-For-Sale Securities, Debt Maturities, Due in One to Two Years, Amortized Cost Basis	139,428	'
Available-For-Sale Securities, Debt Maturities, Due after Two Years, Amortized Cost Basis	90,461	'
Short-Term Investments Total Amortized Cost	379,515	345,087
Short-Term Investments, Maturities, Due within One Year, Fair Value	149,680	'
Available-For-Sale Securities, Debt Maturities, Due in One to Two Years, Fair Value	139,637	'
Available-For-Sale Securities, Debt Maturities, Due after Two Years, Fair Value	90,299	'
Total Short-term Investments, Fair Value Disclosure	$379,616	$345,478

Property_and_Equipment_Details

Property and Equipment (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]	'	'	'
Total property and equipment	$223,971	$214,632	'
Less: Accumulated depreciation and amortization	-66,663	-69,158	'
Total property and equipment, net	157,308	145,474	'
Depreciation and amortization	14,978	12,284	6,274
Land and Building [Member]	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Total property and equipment	138,807	127,685	'
Land [Member]	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Total property and equipment	20,637	20,637	'
Building [Member]	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Property and equipment, useful life	'25 years	'	'
Total property and equipment	105,725	105,725	'
Land Improvements [Member]	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Property and equipment, useful life	'15 years	'	'
Total property and equipment	1,199	1,162	'
Land, Office Building and Land Improvements [Member]	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Total property and equipment	'	127,524	'
Building Improvements [Member]	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Total property and equipment	11,246	161	'
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	62,423	55,568	'
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	8,287	6,849	'
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	$14,454	$24,530	'
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	'9 years	'	'

Property_and_Equipment_Purchas

Property and Equipment (Purchase of Land and Buildings) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012
	buildings
Property, Plant and Equipment [Line Items]	'
Number of Real Estate Properties	2
Contract termination cost	$21.20
Land and Building [Member]	'
Property, Plant and Equipment [Line Items]	'
Net cash payments	$148.60
Land [Member]	'
Property, Plant and Equipment [Line Items]	'
Area of Land (in acres)	11.6

Intangible_Assets_and_Goodwill2

Intangible Assets and Goodwill (Intangible Assets) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Intangible Assets, Net (Excluding Goodwill) [Abstract]	'		'		'
Finite-Lived Intangible Assets, Gross	$189,632,000		$181,381,000		'
Finite-Lived Intangible Assets, Accumulated Amortization	-148,007,000		-117,971,000		'
Finite-Lived Intangible Assets, Net	41,625,000		63,410,000		'
Intangible Assets, Gross (Excluding Goodwill)	189,632,000		185,231,000		'
Total Intangible Assets, Net	41,625,000		67,260,000		'
Amortization of intangible assets and acquired technology	30,036,000		28,558,000		27,220,000
Cost of Services, Amortization	22,307,000		21,980,000		19,503,000
Amortization of intangible assets	7,729,000		6,578,000		7,717,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]	'		'		'
2014	17,747,000		'		'
2015	10,708,000		'		'
2016	6,381,000		'		'
2017	4,026,000		'		'
2018	1,834,000		'		'
Thereafter	929,000		'		'
Finite-Lived Intangible Assets, Net	41,625,000		63,410,000		'
In Process Research and Development [Member]	'		'		'
Intangible Assets, Net (Excluding Goodwill) [Abstract]	'		'		'
Indefinite-Lived Intangible Assets (Excluding Goodwill)	0		3,850,000		'
Developed Technology Rights [Member]	'		'		'
Intangible Assets, Net (Excluding Goodwill) [Abstract]	'		'		'
Finite-Lived Intangible Assets, Gross	130,744,000		123,221,000		'
Finite-Lived Intangible Assets, Accumulated Amortization	-99,026,000		-76,721,000		'
Finite-Lived Intangible Assets, Net	31,718,000		46,500,000		'
Finite-Lived Intangible Assets, Weighted-Average Useful Life (in years)	'6 years		'		'
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]	'		'		'
2014	13,017,000		'		'
2015	8,611,000		'		'
2016	5,082,000		'		'
2017	3,163,000		'		'
2018	1,395,000		'		'
Thereafter	450,000		'		'
Finite-Lived Intangible Assets, Net	31,718,000		46,500,000		'
Other Finite-Lived Intangible Assets [Member]	'		'		'
Intangible Assets, Net (Excluding Goodwill) [Abstract]	'		'		'
Finite-Lived Intangible Assets, Gross	58,888,000		58,160,000		'
Finite-Lived Intangible Assets, Accumulated Amortization	-48,981,000		-41,250,000		'
Finite-Lived Intangible Assets, Net	9,907,000		16,910,000		'
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]	'		'		'
2014	4,730,000		'		'
2015	2,097,000		'		'
2016	1,299,000		'		'
2017	863,000		'		'
2018	439,000		'		'
Thereafter	479,000		'		'
Finite-Lived Intangible Assets, Net	9,907,000		16,910,000		'
Customer Relationships [Member]	'		'		'
Intangible Assets, Net (Excluding Goodwill) [Abstract]	'		'		'
Finite-Lived Intangible Assets, Gross	41,683,000		40,952,000		'
Finite-Lived Intangible Assets, Accumulated Amortization	-35,216,000		-30,063,000		'
Finite-Lived Intangible Assets, Net	6,467,000		10,889,000		'
Finite-Lived Intangible Assets, Weighted-Average Useful Life (in years)	'6 years		'		'
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]	'		'		'
Finite-Lived Intangible Assets, Net	6,467,000		10,889,000		'
All Other [Member]	'		'		'
Intangible Assets, Net (Excluding Goodwill) [Abstract]	'		'		'
Finite-Lived Intangible Assets, Gross	17,205,000	[1]	17,208,000	[1]	'
Finite-Lived Intangible Assets, Accumulated Amortization	-13,765,000	[1]	-11,187,000	[1]	'
Finite-Lived Intangible Assets, Net	3,440,000	[1]	6,021,000	[1]	'
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]	'		'		'
Finite-Lived Intangible Assets, Net	3,440,000	[1]	6,021,000	[1]	'
All Other [Member] \| Minimum [Member]	'		'		'
Intangible Assets, Net (Excluding Goodwill) [Abstract]	'		'		'
Finite-Lived Intangible Assets, Weighted-Average Useful Life (in years)	'4 years		'		'
All Other [Member] \| Maximum [Member]	'		'		'
Intangible Assets, Net (Excluding Goodwill) [Abstract]	'		'		'
Finite-Lived Intangible Assets, Weighted-Average Useful Life (in years)	'11 years		'		'
Heiler Software AG [Member] \| In Process Research and Development [Member]	'		'		'
Intangible Assets, Net (Excluding Goodwill) [Abstract]	'		'		'
IPR&D acquired	'		3,784,000		'
IPR&D reclassed to developed technology	($3,800,000)		'		'

[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, 2013	Dec. 31, 2012	Mar. 31, 2013	Nov. 28, 2012
	Dec. 31, 2013	Dec. 31, 2012	Heiler Software AG [Member]	Heiler Software AG [Member]
Goodwill [Roll Forward]	'	'	'	'
Beginning balance	$510,121,000	$432,269,000	'	$61,660,000
Goodwill from acquisitions	7,110,000	76,669,000	'	'
Subsequent goodwill adjustments	5,911,000	1,183,000	'	'
Ending balance	523,142,000	510,121,000	'	61,660,000
Goodwill, Purchase Accounting Adjustments	'	'	2,800,000	'
Goodwill, Translation Adjustments	4,000,000	1,900,000	'	'
Goodwill, Subsequent Recognition of Deferred Tax Asset	-900,000	'	'	'
Goodwill, Other Changes	'	($700,000)	'	'

Borrowings_Credit_Agreement_De

Borrowings (Credit Agreement) (Details) (USD $)	12 Months Ended
Borrowings (Credit Agreement) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Line of Credit Facility [Line Items]	'	'
Line of Credit Facility, Initiation Date	29-Sep-10	'
Line of Credit Facility, Expiration Date	29-Sep-14	'
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	'
Line of Credit Facility, Amount Outstanding	0	0
Line of Credit Facility, Remaining Borrowing Capacity	$220,000,000	'
Line of Credit Facility, Covenant Compliance	'The Company was in compliance with all covenants under the Credit Agreement as of December 31, 2013.	'
Minimum [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Line of Credit Facility, Commitment Fee Percentage	0.35%	'
Maximum [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Line of Credit Facility, Commitment Fee Percentage	0.50%	'
Line of Credit [Member]	'	'
Line of Credit Facility [Line Items]	'	'
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%	'
Debt Instrument, Additional Interest Margin for Other Overdue Amounts, Stated Percentage	2.00%	'
Line of Credit [Member] \| Base Rate Loan [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Line of Credit, Frequency of Interest Payment (in months)	'3 months	'
Line of Credit [Member] \| Base Rate Loan [Member] \| Base Rate (i) [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Line of Credit Facility, Base Interest Rate Description	'JPMorgan Chase Bank, N.A.'s prime rate	'
Line of Credit [Member] \| Base Rate Loan [Member] \| Base Rate (ii) [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Line of Credit Facility, Base Interest Rate Description	'the federal funds rate plus a margin	'
Debt Instrument, Basis Spread on Variable Rate	0.50%	'
Line of Credit [Member] \| Base Rate Loan [Member] \| Base Rate (iii) [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Line of Credit Facility, Base Interest Rate Description	'LIBOR for a 1-month interest period plus a margin	'
Maturity of Reference Rate, 1-Month LIBOR	'1 month	'
Debt Instrument, Basis Spread on Variable Rate	1.00%	'
Line of Credit [Member] \| Base Rate Loan [Member] \| Minimum [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Debt Instrument, Basis Spread on Variable Rate	1.00%	'
Line of Credit [Member] \| Base Rate Loan [Member] \| Maximum [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Debt Instrument, Basis Spread on Variable Rate	1.75%	'
Line of Credit [Member] \| LIBOR Based Loan [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Line of Credit Facility, Reference Rate (LIBOR) Description	'1-, 2-, 3-, or 6-month	'
Line of Credit [Member] \| LIBOR Based Loan [Member] \| Minimum [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)	'1 month	'
Line of Credit [Member] \| LIBOR Based Loan [Member] \| Maximum [Member]	'	'
Line of Credit Facility [Line Items]	'	'
Debt Instrument, Basis Spread on Variable Rate	2.75%	'
Line of Credit, Frequency of Interest Payment (in months)	'3 months	'

Stockholders_Equity_Class_of_S

Stockholders' Equity Class of Stock (Details) (USD $)	12 Months Ended
Stockholders' Equity Class of Stock (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
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
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 31, 2014
Stock Repurchase Program [Abstract]	'	'	'	'
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$4,000,000	'	'	'
Stock Repurchase Program, Additional Authorized Repurchase Amount	'	'	'	100,000,000
Stock Repurchased and Retired During Period, Shares	2,487,957	2,434,647	1,574,612	'
Stock Repurchased and Retired During Period, Value	$92,068,000	$80,983,000	$74,492,000	'

StockBased_Compensation_Summar

Stock-Based Compensation (Summary of Plans) (Details)

12 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

31-May-08

Apr. 30, 1999

Dec. 31, 2013

Apr. 30, 1999

Dec. 31, 2013

31-May-13

31-May-12

31-May-11

Dec. 31, 2013

Apr. 30, 2009

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Apr. 30, 2009

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

31-May-11

Dec. 31, 2013

31-May-11

Dec. 31, 2013

Restricted Stock Units (RSUs) [Member]

Performance Shares [Member]

Employee Stock Purchase Plan [Member]

1999 Stock Incentive Plan [Member]

Assumed Option Plans (Itemfield) [Member]

Assumed Option Plans (Siperian) [Member]

2009 Equity Incentive Plan [Member]

Stock Options [Member]

Incentive Stock Options [Member]

Non-qualified Stock Options [Member]

Stock Options [Member]

Incentive Stock Options [Member]

Non-qualified Stock Options [Member]

Restricted Stock Units (RSUs) [Member]

Performance Shares [Member]

Stock Options, RSUs, and PRSUs [Member]

Before Plan Amendment Date May 2011 [Member]

After Plan Amendment Date May 2011 [Member]

Lower Limit [Member]

Upper Limit [Member]

New Employee [Member]

Director [Member]

Employees [Member]

New Employee [Member]

Director [Member]

Employees [Member]

Restricted Stock Units (RSUs) [Member]

Performance Shares [Member]

Vesting Period, Year One [Member]

Lower Limit [Member]

Upper Limit [Member]

Lower Limit [Member]

Upper Limit [Member]

Vesting Period, Year One [Member]

Lower Limit [Member]

Upper Limit [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Common Stock, Capital Shares Reserved for Future Issuance

8,850,000

2,600,000

9,000,000

Common Share Reserved for Future Issuance, Authorized Increase at the Beginning of Fiscal Year

'the lesser of 16,000,000 shares or 5% of the total amount of fully diluted shares of common stock outstanding

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%

Minimum exercise price of options as a percentage of the fair value of common stock

100.00%

85.00%

100.00%

85.00%

Share-based Payment Award, Expiration Period

'7 years

'10 years

'5 years

'7 years

'10 years

Award Vesting Period

'4 years

'1 year

'3 years

'4 years

'1 year

'3 years

'4 years

Award Requisite Service Period

'1 year

Number of Shares Available for Grant or Issuance

6,172,544

4,823,800

Number of options outstanding

9,424,000

10,694,000

10,229,000

12,361,000

2,994,056

12,245

Number of Shares or Units, Outstanding

11,799,058

Additional Number of Common Shares Reserved for Future Issuance

4,000,000

5,000,000

2,500,000

Conversion Ratios

1.52

2.37

Option grants in period

2,267,000

2,844,000

1,339,000

2,267,152

2,844,150

1,339,310

Non-option grants in period

835,000

1,095,000

733,000

834,950

1,094,884

733,111

649,900

Equity Instruments Other than Options, Nonvested, Number

1,778,000

280,000

1,498,000

507,000

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

StockBased_Compensation_Valuat

Stock-Based Compensation (Valuation Assumptions) (Details)	12 Months Ended
Stock-Based Compensation (Valuation Assumptions) (Details)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
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	41.00%	39.00%	35.00%
Expected volatility, maximum	43.00%	48.00%	43.00%
Weighted-average volatility	41.00%	44.00%	36.00%
Expected dividends	0.00%	0.00%	0.00%
Expected term	'3 years 3 months 18 days	'3 years 3 months 18 days	'3 years 9 months 18 days
Risk-free interest rate	0.70%	0.50%	1.50%
Employee Stock Purchase Plan [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Expected volatility, minimum	37.00%	43.00%	35.00%
Expected volatility, maximum	42.00%	53.00%	38.00%
Weighted-average volatility	40.00%	49.00%	36.00%
Expected dividends	0.00%	0.00%	0.00%
Expected term	'6 months	'6 months	'6 months
Risk-free interest rate	0.10%	0.10%	0.20%

StockBased_Compensation_Alloca

Stock-Based Compensation (Allocation of Share-Based Compensation Expense) (Details) (USD $)

12 Months Ended

7 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Jun. 30, 2013

Cost of service revenues [Member]

Research and development [Member]

Sales and marketing [Member]

General and administrative [Member]

Heiler Software AG [Member]

Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]

Total stock-based compensation

$57,204,000

$42,803,000

$33,263,000

$5,525,000

$4,349,000

$3,539,000

$19,002,000

$14,919,000

$10,848,000

$19,323,000

$13,518,000

$10,185,000

$13,354,000

$10,017,000

$8,691,000

Estimated tax benefit of stock-based compensation

-15,934,000

-10,994,000

-8,490,000

Total stock-based compensation, net of tax benefit

41,270,000

31,809,000

24,773,000

Post-combination stock-based compensation liabilities paid

$1,100,000

StockBased_Compensation_Stock_

Stock-Based Compensation (Stock Option Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of stock option activity	'	'	'	'
Number of options outstanding at beginning of the year	10,694,000	10,229,000	12,361,000	'
Grants in period, gross	2,267,000	2,844,000	1,339,000	'
Exercises in Period	-2,671,000	-1,884,000	-3,245,000	'
Forfeitures and Expirations in Period	-866,000	-495,000	-226,000	'
Number of options outstanding at end of the year	9,424,000	10,694,000	10,229,000	12,361,000
Weighted average exercise price per share of outstanding options at beginning of the year	$24.79	$19.37	$14.73	'
Weighted average remaining contractual term of outstanding options (in years)	'3 years 5 months 23 days	'3 years 6 months	'3 years 6 months	'3 years 10 months 13 days
Aggregate intrinsic value of outstanding options	$127,697,000	$104,404,000	$218,839,000	$362,236,000
Options Grants in Period, Weighted Average Exercise Price	$37.34	$38.81	$48.28	'
Options Exercises in Period, Weighted Average Exercise Price	$15.24	$13.40	$13.38	'
Options Forfeitures and Expirations in Period, Weighted Average Exercise Price	$40.67	$36.72	$22.76	'
Weighted average exercise price per share of outstanding options at end of the year	$29.05	$24.79	$19.37	$14.73
Options Exercisable, Number	6,095,000	'	'	'
Options Exercisable, Weighted Average Exercise Price	$24.34	'	'	'
Options Exercisable, Weighted Average Remaining Contractual Term (in years)	'2 years 3 months 25 days	'	'	'
Options, Exercisable, Aggregate Intrinsic Value	111,562,000	'	'	'
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]	'	'	'	'
Grant date fair value of options vested	18,500,000	15,600,000	14,500,000	'
Options nonvested, number of shares outstanding	3,329,000	'	'	'
Nonvested awards, fair value	$31,400,000	'	'	'
Nonvested Options, Weighted Average Grant Price	$37.69	'	'	'
Nonvested awards, weighted average period for recognition	'2 years 7 months 13 days	'	'	'

StockBased_Compensation_Summar1

Stock-Based Compensation (Summary of Stock Options Outstanding and Exercisable, by Exercise Price Range) (Details) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Number of Outstanding Options	9,424
Weighted Average Remaining Contractual Life (in years)	'3 years 5 months 23 days
Weighted Average Exercise Price Per Share, Options Outstanding	$29.05
Number of Exercisable Options	6,095
Weighted Average Exercise Price Per Share, Options Exercisable	$24.34
Range 1 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Exercise Price Range, Lower Range Limit	$4.23
Exercise Price Range, Upper Range Limit	$13.14
Number of Outstanding Options	1,611
Weighted Average Remaining Contractual Life (in years)	'0 years 7 months 6 days
Weighted Average Exercise Price Per Share, Options Outstanding	$6.85
Number of Exercisable Options	1,611
Weighted Average Exercise Price Per Share, Options Exercisable	$6.85
Range 2 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Exercise Price Range, Lower Range Limit	$13.86
Exercise Price Range, Upper Range Limit	$24.38
Number of Outstanding Options	2,092
Weighted Average Remaining Contractual Life (in years)	'1 year 7 months 24 days
Weighted Average Exercise Price Per Share, Options Outstanding	$19.22
Number of Exercisable Options	2,067
Weighted Average Exercise Price Per Share, Options Exercisable	$19.16
Range 3 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Exercise Price Range, Lower Range Limit	$25.46
Exercise Price Range, Upper Range Limit	$37.43
Number of Outstanding Options	2,867
Weighted Average Remaining Contractual Life (in years)	'5 years 5 months 1 day
Weighted Average Exercise Price Per Share, Options Outstanding	$33.15
Number of Exercisable Options	899
Weighted Average Exercise Price Per Share, Options Exercisable	$30.96
Range 4 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Exercise Price Range, Lower Range Limit	$38.11
Exercise Price Range, Upper Range Limit	$44.06
Number of Outstanding Options	1,798
Weighted Average Remaining Contractual Life (in years)	'5 years 0 months 14 days
Weighted Average Exercise Price Per Share, Options Outstanding	$42.51
Number of Exercisable Options	744
Weighted Average Exercise Price Per Share, Options Exercisable	$43.52
Range 5 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Exercise Price Range, Lower Range Limit	$46.63
Exercise Price Range, Upper Range Limit	$54.93
Number of Outstanding Options	996
Weighted Average Remaining Contractual Life (in years)	'3 years 6 months 7 days
Weighted Average Exercise Price Per Share, Options Outstanding	$47.87
Number of Exercisable Options	714
Weighted Average Exercise Price Per Share, Options Exercisable	$47.74
Range 6 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Exercise Price Range, Lower Range Limit	$56.27
Exercise Price Range, Upper Range Limit	$56.27
Number of Outstanding Options	60
Weighted Average Remaining Contractual Life (in years)	'4 years 4 months 24 days
Weighted Average Exercise Price Per Share, Options Outstanding	$56.27
Number of Exercisable Options	60
Weighted Average Exercise Price Per Share, Options Exercisable	$56.27

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, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of restricted stock unit activity	'	'	'
Non-Option Equity Instruments, Outstanding, Number	1,927,000	1,611,000	1,405,000
Non-option grants in period	835,000	1,095,000	733,000
Released in Period	-711,000	-535,000	-407,000
Non-option forfeited in period	-258,000	-244,000	-120,000
Non-Option Equity Instruments, Outstanding, Number	1,793,000	1,927,000	1,611,000
Equity Instruments Other than Options, Vested Deferred, Number	15,000	'	'
RSU nonvested, weighted average grant date fair value	$35.50	$40.13	$50
Released in period, weighted average grant date fair value	$35.74	$42.16	$50.55
RSU forfeited in period, weighted average grant date fair value	$39.91	$39.30	$29
Restricted Stock Unit, Additional Disclosures [Abstract]	'	'	'
Nonvested awards, fair value	$45	'	'
Nonvested awards, weighted average period for recognition	'2 years 6 months 22 days	'	'
2009 Equity Incentive Plan [Member]	'	'	'
Summary of restricted stock unit activity	'	'	'
Non-option grants in period	834,950	1,094,884	733,111
Nonvested shares outstanding at end of the year	1,778,000	'	'

StockBased_Compensation_Perfor

Stock-Based Compensation (Performance Restricted Share Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Stock-based compensation	$57,204,000	$42,803,000	$33,263,000
Performance Shares [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Award Vesting Period	'4 years	'	'
Maximum Percentage of Target Number of Shares Eligible to Receive	'	150.00%	'
Nonvested awards, fair value	8,000,000	'	'
Stock-based compensation	'	$0	'
Nonvested awards, weighted average period for recognition	'1 year 7 months 2 days	'	'
Performance Shares [Member] \| Vesting Period, Year One [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Award Vesting Rights, Percentage	25.00%	'	'
Performance Shares [Member] \| Vesting Period, After Year One [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Award Vesting Rights, Percentage	75.00%	'	'
Performance Shares [Member] \| 2013 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%	'	'
Performance Shares [Member] \| 2013 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%	'	'
Performance Shares [Member] \| 2012 Award Recipients [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Maximum Percentage of Target Number of Shares Eligible to Receive	'	150.00%	'
2009 Equity Incentive Plan [Member] \| Performance Shares [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Non-option grants in period	649,900	0	'
Equity Instruments Other than Options, Grants in Period, Target Number	649,900	224,000	'
2009 Equity Incentive Plan [Member] \| After Plan Amendment Date May 2011 [Member] \| Performance Shares [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Nonvested shares outstanding at end of the year	507,000	'	'

StockBased_Compensation_Additi

Stock-Based Compensation (Additional Disclosures Pertaining to All Share-Based Compensation Plans) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Proceeds from Issuance of Common Stock	$58,669,000	$41,351,000	$58,727,000
Tax benefits from stock-based compensation	26,082,000	16,463,000	29,096,000
Excess tax benefits from stock-based compensation	27,495,000	17,021,000	29,952,000
Stock Options [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Options grants in period, weighted average grant date fair value	$8.96	$12.06	$14.15
Options grants in period, exercise price less than grant date fair value	0	0	0
Options exercises in period, total intrinsic value	58,400,000	53,500,000	117,600,000
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	$38.50	$38.08	$34.47
Performance Shares [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Grants in period, weighted average grant date fair value	$37.42	'	'
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	$10.01	$9.93	$12.34
Total intrinsic value of shares purchased	$6,500,000	$2,800,000	$8,700,000

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Loss (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]	'		'	'
Accumulated other comprehensive income (loss) as of December 31, 2012	($8,030)		'	'
Other comprehensive income (loss):	'		'	'
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	3,633		'	'
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax	1,185		'	'
Total other comprehensive income (loss), net of tax effect	4,818		4,772	-7,272
Accumulated other comprehensive loss as of December 31, 2013	-3,212		-8,030	'
Other Comprehensive Income (Loss), Tax [Abstract]	'		'	'
Tax benefit (expense) related to foreign currency translation adjustment	-172		-144	106
Cumulative translation reclassification adjustment, no tax effect	0		'	'
Tax benefit (expense) related to available-for-sale investments before reclassification adjustment	126		-244	133
Tax benefit of reclassification adjustment for sale of securities included in net income	16		-19	-40
Tax benefit related to unrealized loss on cash flow hedges arising during the period	794		226	1,534
Tax benefit of reclassification adjustment on cash flow hedges included in net income	710		865	910
Other-than-temporary gain or loss reflected in accumulated other comprehensive loss	0		0	'
Accumulated Translation Adjustment [Member]	'		'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'		'	'
Accumulated other comprehensive income (loss) as of December 31, 2012	-8,012		'	'
Other comprehensive income (loss):	'		'	'
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	5,133		'	'
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax	0		'	'
Total other comprehensive income (loss), net of tax effect	5,133		'	'
Accumulated other comprehensive loss as of December 31, 2013	-2,879		'	'
Accumulated Net Unrealized Investment Gain (Loss) [Member]	'		'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'		'	'
Accumulated other comprehensive income (loss) as of December 31, 2012	242		'	'
Other comprehensive income (loss):	'		'	'
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	-205		'	'
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax	26	[1]	'	'
Total other comprehensive income (loss), net of tax effect	-179		'	'
Accumulated other comprehensive loss as of December 31, 2013	63		'	'
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]	'		'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'		'	'
Accumulated other comprehensive income (loss) as of December 31, 2012	-260		'	'
Other comprehensive income (loss):	'		'	'
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	-1,295		'	'
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax	1,159	[2]	'	'
Total other comprehensive income (loss), net of tax effect	-136		'	'
Accumulated other comprehensive loss as of December 31, 2013	($396)		'	'

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Derivative_Financial_Instrumen2

Derivative Financial Instruments (Fair Value) (Details) (Foreign Exchange Forward [Member], USD $)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Cash Flow Hedging [Member]

Designated as Hedging Instrument [Member]

Not Designated as Hedging Instrument [Member]

Long [Member]

Cash Flow Hedging [Member]

Not Designated as Hedging Instrument [Member]

Derivatives, Fair Value [Line Items]

Maximum Remaining Maturity of Foreign Currency Derivatives

'13 months

Notional Amount of Foreign Currency Derivative Contracts

$30,100,000

$23,600,000

$2,600,000

$2,700,000

Derivative Asset, Fair Value, Gross Asset

284,000

[1]

284,000

[1]

Derivative Liability, Fair Value, Gross Liability

$1,024,000

[2]

$408,000

[2]

$830,000

[2]

$224,000

[2]

$194,000

[2]

$184,000

[2]

[1]

Included in prepaid expenses and other current assets on the consolidated balance sheets.

[2]

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, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Foreign Exchange Forward [Member]	'		'
Offsetting Assets [Line Items]	'		'
Derivative Asset, Fair Value, Gross Asset	$284	[1]	$0	[1]
Derivative Asset, Fair Value, Gross Liability	0		'
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	284		'
Derivative, Collateral, Obligation to Return Securities	-268	[2]	'
Derivative, Collateral, Obligation to Return Cash	0		'
Derivative Asset, Fair Value, Amount Offset Against Collateral	$16		'

[1]	Included in prepaid expenses and other current assets on the consolidated balance sheets.
[2]	The balances at December 31, 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, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Foreign Exchange Forward [Member]	'		'
Offsetting Liabilities [Line Items]	'		'
Derivative Liability, Fair Value, Gross Liability	$1,024	[1]	$408	[1]
Derivative Liability, Fair Value, Gross Asset	0		'
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	1,024		'
Derivative, Collateral, Right to Reclaim Securities	-268	[2]	'
Derivative, Collateral, Right to Reclaim Cash	0		'
Derivative Liability, Fair Value, Amount Offset Against Collateral	$756		'

[1]	Included in accrued liabilities on the consolidated balance sheets.
[2]	The balances at December 31, 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, 2013	Dec. 31, 2012	Dec. 31, 2011
Designated as Hedging Instrument [Member]	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'
Amount of loss recognized in other comprehensive income (effective portion)	($2,089)	($594)	($4,037)
Amount of loss reclassified from accumulated other comprehensive income to operating expenses (effective portion)	-1,869	-2,275	-2,395
Amount of gain recognized in income excluded from effectiveness testing located in operating expenses	728	1,227	161
Not Designated as Hedging Instrument [Member]	'	'	'
Derivative, Gain (Loss) on Derivative, Net [Abstract]	'	'	'
Gain (loss) recognized in interest and other income (expense), net	($161)	($904)	$2,296

Employee_401K_Plan_Details

Employee 401(K) Plan (Details) (USD $)	12 Months Ended
Employee 401(K) Plan (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Contribution Plan Disclosure [Line Items]	'	'	'
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	4,500,000	3,600,000	2,700,000
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, 2013	Dec. 31, 2012	Dec. 31, 2011
Current tax provision:	'	'	'
Federal	$65,344	$35,481	$38,179
State	10,167	4,337	5,954
Foreign	2,882	9,417	4,943
Total current tax provision	78,393	49,235	49,076
Deferred tax provision:	'	'	'
Federal	-24,469	-3,044	3,119
State	-3,334	597	-3,197
Foreign	3,737	-2,203	135
Total deferred tax provision	-24,066	-4,650	57
Total provision for income taxes	$54,327	$44,585	$49,133

Income_Taxes_Income_before_Inc

Income Taxes (Income before Income Taxes) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Components of Income Before Income Tax Expense (Benefit) [Line Items]	'	'	'
Domestic	$118,939	$87,981	$120,507
Foreign	21,783	49,786	46,121
Income before income taxes	$140,722	$137,767	$166,628

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, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Statutory Federal Tax Rate [Line Items]	'	'	'
Income tax provision, computed at federal statutory tax rate	$49,253	$48,218	$58,320
State taxes, net of federal benefit	2,249	1,402	2,231
Foreign earnings taxed at different rates	1,550	-10,951	-9,328
Stock-based compensation	3,397	3,270	571
Return to provision true-up	-668	92	-131
Research and development credits	-3,715	0	-3,023
ASC 740-10 and other	-746	679	493
Valuation allowance	3,007	1,875	0
Total provision for income taxes	$54,327	$44,585	$49,133

Income_Taxes_Deferred_Tax_Asse

Income Taxes (Deferred Tax Assets and Liabilities) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:	'	'	'
Net operating loss carryforwards	$23,710,000	$33,095,000	'
Tax credit carryforwards	10,131,000	8,563,000	'
Deferred revenue	19,240,000	11,231,000	'
Reserves and accrued costs not currently deductible	15,097,000	12,325,000	'
Depreciable assets	6,450,000	11,003,000	'
Share-based compensation	20,149,000	15,208,000	'
Other	381,000	0	'
Valuation allowance	-4,552,000	-20,179,000	'
Total deferred tax assets	90,606,000	71,246,000	'
Deferred tax liabilities:	'	'	'
Non-deductible intangible assets	-12,887,000	-25,435,000	'
Other	0	-897,000	'
Total deferred tax liabilities	-12,887,000	-26,332,000	'
Net deferred tax assets	77,719,000	44,914,000	'
Decrease in Valuation Allowance, Deferred Tax Asset	-15,600,000	-4,900,000	-6,600,000
TaxCreditResearch [Member] \| State and Local Jurisdiction [Member]	'	'	'
Deferred tax assets:	'	'	'
Valuation allowance	($3,500,000)	'	'

Income_Taxes_Operating_Loss_Ca

Income Taxes (Operating Loss Carryforwards) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013
Internal Revenue Service (IRS) [Member]	'
Operating Loss Carryforwards [Line Items]	'
Operating Loss Carryforwards	57.3
State and Local Jurisdiction [Member]	'
Operating Loss Carryforwards [Line Items]	'
Operating Loss Carryforwards	23.3
Domestic Tax Authority [Member]	'
Operating Loss Carryforwards [Line Items]	'
Operating Loss Carryforwards, Expiration Date	31-Dec-14
Foreign Tax Authority [Member]	'
Operating Loss Carryforwards [Line Items]	'
Operating Loss Carryforwards	5.4
Operating Loss Carryforwards, Valuation Allowance	1.1

Income_Taxes_Tax_Credit_Carryf

Income Taxes (Tax Credit Carryforwards) (Details) (Research Tax Credit Carryforward [Member], State and Local Jurisdiction [Member], USD $)	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2013
Research Tax Credit Carryforward [Member] \| State and Local Jurisdiction [Member]	'
Tax Credit Carryforward [Line Items]	'
Tax Credit Carryforward Amount, Not Subject to Expiration	$19.40

Income_Taxes_Deferred_Tax_Liab

Income Taxes (Deferred Tax Liability Not Recognized) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013
Deferred Tax Liability Not Recognized, Undistributed Earnings of Foreign Subsidiaries [Abstract]	'
Undistributed Earnings of Foreign Subsidiaries	$103.40
Deferred Tax Liability Not Recognized, Determination of Deferred Tax Liability is Not Practicable, Undistributed Earnings of Foreign Subsidiaries	'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.

Income_Taxes_Unrecognized_Tax_

Income Taxes (Unrecognized Tax Benefits) (Details) (USD $)	12 Months Ended
Income Taxes (Unrecognized Tax Benefits) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Contingency [Line Items]	'	'	'
Beginning balance	$21,079,000	$16,298,000	$12,400,000
Additions for tax positions of prior years	672,000	2,407,000	1,925,000
Reductions for tax positions of prior years	-668,000	-475,000	-569,000
Additions based on tax positions related to the current year	9,671,000	4,335,000	3,155,000
Reductions due to lapse of statute of limitations	-1,580,000	-1,486,000	-491,000
Reductions due to settlements	0	0	-122,000
Ending balance	29,174,000	21,079,000	16,298,000
Unrecognized tax benefits that would impact effective tax rate	25,900,000	18,900,000	15,300,000
Unrecognized Tax Benefits	29,174,000	21,079,000	16,298,000
Unrecognized tax benefits, income tax penalties and interest accrued	$3,200,000	$2,300,000	'

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, 2013
Lower Limit [Member]	'
Income Tax Examination [Line Items]	'
Income Tax Examination, Year under Examination	'2003
Maximum [Member]	'
Income Tax Examination [Line Items]	'
Income Tax Examination, Year under Examination	'2011

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, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net income	$39,918	$10,404	$18,166	$17,907	$31,066	$15,501	$20,086	$26,529	$86,395	$93,182	$117,495
Basic net income per common share	$0.37	$0.10	$0.17	$0.17	$0.29	$0.14	$0.19	$0.25	$0.80	$0.86	$1.13
Effect of convertible senior notes, net of related tax effects	'	'	'	'	'	'	'	'	0	0	811
Net income adjusted-diluted	'	'	'	'	'	'	'	'	$86,395	$93,182	$118,306
Weighted Average Number Diluted Shares Outstanding Adjustment [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Weighted-average shares of common stock used to compute basic net income per share (excluding unvested restricted stock)	108,462	108,305	108,138	107,669	107,627	108,091	108,245	107,576	108,146	107,874	103,956
Dilutive effect of convertible senior notes	'	'	'	'	'	'	'	'	0	0	2,061
Shares used in computing diluted net income per common share	111,457	111,501	111,344	111,263	110,802	111,776	113,027	112,792	111,394	112,089	112,540
Diluted net income per common share	$0.36	$0.09	$0.16	$0.16	$0.28	$0.14	$0.18	$0.24	$0.78	$0.83	$1.05
Weighted average stock options and restricted stock units excluded from calculation due to anti-dilutive effect	'	'	'	'	'	'	'	'	5,666	3,844	1,273
Stock Options [Member]	'	'	'	'	'	'	'	'	'	'	'
Weighted Average Number Diluted Shares Outstanding Adjustment [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Incremental Common Shares Attributable to Share-based Payment Arrangements	'	'	'	'	'	'	'	'	2,925	3,863	6,001
Restricted Stock Units (RSUs) [Member]	'	'	'	'	'	'	'	'	'	'	'
Weighted Average Number Diluted Shares Outstanding Adjustment [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Incremental Common Shares Attributable to Share-based Payment Arrangements	'	'	'	'	'	'	'	'	323	352	522

Commitments_and_Contingencies_1

Commitments and Contingencies (Lease Commitments) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Commitments and Contingencies Disclosure [Line Items]	'	'	'
Lease Expiration Year	'2024	'	'
Operating Leases, Rent Expense, Net	$16,300,000	$15,100,000	$14,900,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]	'	'	'
Operating Leases, Future Minimum Payments, Due in 2014	10,324,000	'	'
Operating Leases, Future Minimum Payments, Due in 2015	10,892,000	'	'
Operating Leases, Future Minimum Payments, Due in 2016	7,911,000	'	'
Operating Leases, Future Minimum Payments, Due in 2017	5,771,000	'	'
Operating Leases, Future Minimum Payments, Due in 2018	4,676,000	'	'
Operating Leases, Future Minimum Payments, Due Thereafter	9,336,000	'	'
Operating Leases, Total Future Minimum Payments Due	$48,910,000	'	'

Commitments_and_Contingencies_2

Commitments and Contingencies (Warranty Accrual) (Details)	12 Months Ended
Commitments and Contingencies (Warranty Accrual) (Details)	Dec. 31, 2013
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) (Service Provider with Board of Directors Ownership [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Service Provider with Board of Directors Ownership [Member]	'	'	'
Related Party Transaction [Line Items]	'	'	'
Related Party Transaction, Amounts of Transaction	$1.90	$1	$0.90

Significant_Customer_Informati2

Significant Customer Information and Segment Information (Total Revenue and Property and Equipment, Net by Geographic Region) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	$276,038	$235,394	$222,439	$214,300	$234,741	$190,318	$190,492	$196,020	$948,171	$811,571	$783,779
Property and equipment, net	157,308	'	'	'	145,474	'	'	'	157,308	145,474	'
North America [Member]	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	642,707	524,191	516,348
Property and equipment, net	147,460	'	'	'	135,388	'	'	'	147,460	135,388	'
EMEA [Member]	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	211,504	202,861	195,850
Property and equipment, net	4,907	'	'	'	3,395	'	'	'	4,907	3,395	'
Other [Member]	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	93,960	84,519	71,581
Property and equipment, net	$4,941	'	'	'	$6,691	'	'	'	$4,941	$6,691	'

Significant_Customer_Informati3

Significant Customer Information and Segment Information (Revenues) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Sales Revenue, Software, Net [Abstract]	'	'	'	'	'	'	'	'	'	'	'
License	'	'	'	'	'	'	'	'	$367,074	$320,982	$353,664
Subscription	'	'	'	'	'	'	'	'	46,664	29,193	18,565
Total software revenues	'	'	'	'	'	'	'	'	413,738	350,175	372,229
Sales Revenue, Services, Net [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Maintenance	'	'	'	'	'	'	'	'	409,325	360,769	314,043
Consulting and education	'	'	'	'	'	'	'	'	125,108	100,627	97,507
Total service revenues	'	'	'	'	'	'	'	'	534,433	461,396	411,550
Total revenues	276,038	235,394	222,439	214,300	234,741	190,318	190,492	196,020	948,171	811,571	783,779
Portion of International Revenue to Consolidated Revenue	'	'	'	'	'	'	'	'	32.00%	35.00%	34.00%
North America [Member]	'	'	'	'	'	'	'	'	'	'	'
Sales Revenue, Services, Net [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	642,707	524,191	516,348
EMEA [Member]	'	'	'	'	'	'	'	'	'	'	'
Sales Revenue, Services, Net [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	211,504	202,861	195,850
Other [Member]	'	'	'	'	'	'	'	'	'	'	'
Sales Revenue, Services, Net [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	'	'	'	'	'	'	'	'	$93,960	$84,519	$71,581

Significant_Customer_Informati4

Significant Customer Information and Segment Information (Additional Information) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	segment	customers	customers
	customers	segment
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	'

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, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Quarterly Financial Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Total revenues	$276,038	$235,394	$222,439	$214,300	$234,741	$190,318	$190,492	$196,020	$948,171	$811,571	$783,779
Gross Profit	228,794	189,838	177,854	170,404	194,257	153,566	152,295	158,831	766,890	658,949	640,324
Income from operations	61,027	27,206	25,931	24,699	44,601	25,139	28,202	38,017	138,863	135,959	164,698
Net income	$39,918	$10,404	$18,166	$17,907	$31,066	$15,501	$20,086	$26,529	$86,395	$93,182	$117,495
Earnings Per Share, Basic	$0.37	$0.10	$0.17	$0.17	$0.29	$0.14	$0.19	$0.25	$0.80	$0.86	$1.13
Earnings Per Share, Diluted	$0.36	$0.09	$0.16	$0.16	$0.28	$0.14	$0.18	$0.24	$0.78	$0.83	$1.05
Weighted Average Number of Shares Outstanding, Basic	108,462	108,305	108,138	107,669	107,627	108,091	108,245	107,576	108,146	107,874	103,956
Weighted Average Number of Shares Outstanding, Diluted	111,457	111,501	111,344	111,263	110,802	111,776	113,027	112,792	111,394	112,089	112,540

Acquisitions_Details

Acquisitions (Details)

12 Months Ended

1 Months Ended

3 Months Ended

7 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Feb. 28, 2013

Nov. 30, 2012

Mar. 31, 2013

Jun. 30, 2013

Dec. 31, 2012

Nov. 28, 2012

Dec. 31, 2012

Nov. 28, 2012

Dec. 31, 2013

Dec. 31, 2012

Sep. 10, 2012

Dec. 31, 2013

Sep. 10, 2012

USD ($)

Active Endpoints [Member]

Heiler Software AG [Member]

Series of Individually Immaterial Business Acquisitions [Member]

Fair Value, Inputs, Level 3 [Member]

USD ($)

EUR (€)

In Process Research And Development [Member]

Developed and Core Technology [Member]

Customer Relationships [Member]

Contract Backlog [Member]

Trade Names [Member]

USD ($)

Series of Individually Immaterial Business Acquisitions [Member]

USD ($)

Business Acquisition [Line Items]

Goodwill, Purchase Accounting Adjustments

$2,800,000

Business Acquisition, Goodwill, Expected Tax Deductible Amount

Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest [Abstract]

Percentage of Shares Tendered for Purchase

100.00%

97.70%

Tender Offer Price

€ 7.04

Business Combination, Consideration Transferred

101,900,000

Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]

Net tangible assets acquired and liabilities assumed

-900,000

16,400,000

-3,900,000

Finite-Lived Intangibles

16,586,000

5,339,000

648,000

298,000

Indefinite-lived Intangible Assets Acquired

3,784,000

Identifiable intangible assets

3,800,000

3,900,000

Noncontrolling interest,

-2,861,000

Total identifiable net assets

40,194,000

Goodwill

523,142,000

510,121,000

432,269,000

7,100,000

61,660,000

15,000,000

Total cash consideration

101,854,000

Identifiable assets acquired, goodwill, and liabilities assumed, net

10,000,000

15,000,000

Transaction related costs and other accrued liabilities

1,900,000

Business Combination, Consideration Transferred [Abstract]

Total cash and noncash consideration

10,000,000

12,000,000

Amount held back

2,100,000

Contingent consideration, at gross amount

6,000,000

Amount of consideration placed into escrow

1,500,000

Business Combination, Assets and Liabilities Arising from Contingencies [Abstract]

Earnout payments

4,170,000

8,050,000

1,000,000

1,800,000

200,000

Business Combination, Contingent Consideration, Liability

3,100,000

4,900,000

Business Combination, Step Acquisition, Payments for Purchases of Additional Equity Interest in Acquiree after Acquisition Date

6,800,000

Step Acquisition, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest, Including Purchases of Additional Equity Interest in Acquiree

$108,700,000

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, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts [Member]	'	'	'
Movement in Valuation Allowances and Reserves [Roll Forward]	'	'	'
Valuation Allowances and Reserves, Beginning Balance	$5,460	$4,001	$4,289
Valuation Allowances and Reserves, Charged to Cost and Expense	-1,157	428	-31
Valuation Allowances and Reserves, Reserves of Businesses Acquired	6	1,139	33
Valuation Allowances and Reserves, Deductions	-174	-108	-290
Valuation Allowances and Reserves, Ending Balance	$4,135	$5,460	$4,001