Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 402,933	$ 260,149
Short-term investments, available-for-sale	580,386	529,260
Accounts receivable, net of allowances of $5,494 and $5,976 at March 31, 2015 and December 31, 2014, respectively	438,177us-gaap_AccountsReceivableNetCurrent	674,401us-gaap_AccountsReceivableNetCurrent
Inventories, net	12,024us-gaap_InventoryNet	12,617us-gaap_InventoryNet
Prepaid expenses and other current assets	186,222	166,005
Current portion of deferred tax assets, net	48,914us-gaap_DeferredTaxAssetsNetCurrent	45,892us-gaap_DeferredTaxAssetsNetCurrent
Total current assets	1,668,656us-gaap_AssetsCurrent	1,688,324us-gaap_AssetsCurrent
Long-term investments, available-for-sale	986,295	1,073,110
Property and equipment, net	373,384us-gaap_PropertyPlantAndEquipmentNet	367,779us-gaap_PropertyPlantAndEquipmentNet
Goodwill	1,858,080us-gaap_Goodwill	1,796,851us-gaap_Goodwill
Other intangible assets, net	411,469	390,717
Long-term portion of deferred tax assets, net	81,680us-gaap_DeferredTaxAssetsNetNoncurrent	128,198us-gaap_DeferredTaxAssetsNetNoncurrent
Other assets	75,072us-gaap_OtherAssetsNoncurrent	67,028us-gaap_OtherAssetsNoncurrent
Total assets	5,454,636us-gaap_Assets	5,512,007us-gaap_Assets
Current liabilities:
Accounts payable	81,109us-gaap_AccountsPayableCurrent	79,884us-gaap_AccountsPayableCurrent
Accrued expenses and other current liabilities	275,834us-gaap_AccruedLiabilitiesCurrent	298,079us-gaap_AccruedLiabilitiesCurrent
Income taxes payable	6,768us-gaap_AccruedIncomeTaxesCurrent	12,053us-gaap_AccruedIncomeTaxesCurrent
Short-term debt	95,000us-gaap_LinesOfCreditCurrent	0us-gaap_LinesOfCreditCurrent
Current portion of deferred revenues	1,175,227us-gaap_DeferredRevenueCurrent	1,200,093us-gaap_DeferredRevenueCurrent
Total current liabilities	1,633,938us-gaap_LiabilitiesCurrent	1,590,109us-gaap_LiabilitiesCurrent
Long-term portion of deferred revenues	340,794us-gaap_DeferredRevenueNoncurrent	357,771us-gaap_DeferredRevenueNoncurrent
Convertible notes	1,300,872us-gaap_ConvertibleDebtNoncurrent	1,292,953us-gaap_ConvertibleDebtNoncurrent
Other liabilities	78,701us-gaap_OtherLiabilitiesNoncurrent	97,529us-gaap_OtherLiabilitiesNoncurrent
Commitments and contingencies
Stockholders' equity:
Preferred stock at $.01 par value: 5,000 shares authorized, none issued and outstanding	0us-gaap_PreferredStockValue	0us-gaap_PreferredStockValue
Common stock at $.001 par value: 1,000,000 shares authorized; 296,384 and 294,674 shares issued and outstanding at March 31, 2015 and December 31, 2014, respectively	296us-gaap_CommonStockValue	295us-gaap_CommonStockValue
Additional paid-in capital	4,340,836	4,292,706
Retained earnings	3,184,151	3,155,264
Accumulated other comprehensive loss	(35,972)	(36,790)
Stockholders' equity before treasury stock	7,489,311	7,411,475
Less - common stock in treasury, at cost (136,292 and 133,898 shares at March 31, 2015 and December 31, 2014, respectively)	(5,388,980)us-gaap_TreasuryStockValue	(5,237,830)us-gaap_TreasuryStockValue
Total stockholders' equity	2,100,331	2,173,645
Total liabilities and stockholders' equity	$ 5,454,636	$ 5,512,007

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph a

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(a))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682