Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 77,746us-gaap_NetIncomeLoss	$ 72,800us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	70,460	53,516
Stock-based compensation	29,669us-gaap_ShareBasedCompensation	25,114us-gaap_ShareBasedCompensation
Excess tax benefits from stock-based compensation	(13,128)	(15,178)
Provision for deferred income taxes	8,305us-gaap_DeferredIncomeTaxExpenseBenefit	1,660us-gaap_DeferredIncomeTaxExpenseBenefit
Amortization of debt discount and issuance costs	4,576	1,941
Other non-cash items, net	443	302
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(32,552)	(18,137)
Prepaid expenses and other current assets	(1,817)	(20,961)
Accounts payable and accrued expenses	(52,703)	(22,511)
Deferred revenue	6,947	5,159
Other current liabilities	42	1,287
Other non-current assets and liabilities	1,741	4,031
Net cash provided by operating activities	99,729	89,023
Cash flows from investing activities:
Cash paid for acquired businesses, net of cash acquired	(16,062)	(386,647)
Purchases of property and equipment	(91,924)	(52,011)
Capitalization of internal-use software development costs	(45,145)us-gaap_PaymentsForSoftware	(31,995)us-gaap_PaymentsForSoftware
Purchases of short- and long-term marketable securities	(97,304)	(658,943)
Proceeds from sales of short- and long-term marketable securities	2,008	297,059
Proceeds from maturities of short- and long-term marketable securities	305,647	102,911
Other non-current assets and liabilities	(82)	(832)
Net cash provided by (used in) investing activities	57,138	(730,458)
Cash flows from financing activities:
Proceeds from the issuance of convertible senior notes, net of issuance costs	0us-gaap_ProceedsFromConvertibleDebt	679,603us-gaap_ProceedsFromConvertibleDebt
Proceeds from the issuance of warrants related to convertible senior notes	0us-gaap_ProceedsFromIssuanceOfWarrants	77,970us-gaap_ProceedsFromIssuanceOfWarrants
Purchase of note hedge related to convertible senior notes	0	(101,292)
Repayment of acquired debt and capital leases	0	(17,862)
Proceeds related to the issuance of common stock under stock plans	24,440	44,329
Excess tax benefits from stock-based compensation	13,128	15,178
Employee taxes paid related to net share settlement of stock-based awards	(31,101)	(26,271)
Repurchases of common stock	(62,680)	(116,147)
Net cash (used in) provided by financing activities	(56,213)	555,508
Effects of exchange rate changes on cash and cash equivalents	(6,747)	762
Net increase (decrease) in cash and cash equivalents	93,907	(85,165)
Cash and cash equivalents at beginning of period	238,650	333,891
Cash and cash equivalents at end of period	332,557	248,726
Supplemental disclosure of cash flow information:
Cash paid for income taxes	24,131us-gaap_IncomeTaxesPaid	54,479us-gaap_IncomeTaxesPaid
Non-cash investing and financing activities:
Purchases of property and equipment and capitalization of internal-use software development costs included in accounts payable and accrued expenses	31,565	20,093
Capitalization of stock-based compensation	$ 4,144	$ 3,784

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The cash outflow associated with the development, modification or acquisition of software programs or applications for internal use (that is, not to be sold, leased or otherwise marketed to others) that qualify for capitalization.

+ References

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- Definition

Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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

-Publisher FASB

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-Topic 230

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-Section 45

-Paragraph 13

-Subparagraph (a),(b)

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-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26853-111562

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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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- Definition

The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585

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- Definition

The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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

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-Glossary Financing Activities

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-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585

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- Definition

The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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-Paragraph 14

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Paragraph 11

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-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585

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- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

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-Topic 320

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-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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