CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 659,571us-gaap_NetIncomeLoss	$ 652,800us-gaap_NetIncomeLoss	$ 620,000us-gaap_NetIncomeLoss
Adjustments required to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment	9,178	8,545	7,861
Amortization of premium and accretion of discount on marketable securities, net and revaluation of short-term bank deposits	33,021	22,389	33,784
Realized gain on sale of marketable securities, net	(288)us-gaap_GainLossOnSaleOfInvestments	(2,311)us-gaap_GainLossOnSaleOfInvestments	(1,436)us-gaap_GainLossOnSaleOfInvestments
Amortization of intangible assets	2,106us-gaap_AmortizationOfIntangibleAssets	3,020us-gaap_AmortizationOfIntangibleAssets	7,028us-gaap_AmortizationOfIntangibleAssets
Stock-based compensation	63,169us-gaap_ShareBasedCompensation	51,112us-gaap_ShareBasedCompensation	45,287us-gaap_ShareBasedCompensation
Deferred income tax expense (benefit)	(12,292)us-gaap_DeferredOtherTaxExpenseBenefit	28us-gaap_DeferredOtherTaxExpenseBenefit	(1,453)us-gaap_DeferredOtherTaxExpenseBenefit
Excess tax benefit from stock-based compensation	(11,669)	(35,345)	(11,128)
Accrued severance pay, net	(407)	158	57
Decrease (increase) in trade receivables	12,948	(5,893)	(16,337)
Decrease (increase) in prepaid expenses and other current assets and other assets	(8,613)	(816)	4,592
Increase in trade payables	1,879	1,287	5,445
Increase in employees and payroll accruals	2,698	22,404	958
Increase (decrease) in accrued expenses and other liabilities	(77,809)	11,975	117,371
Increase in deferred revenues	112,390	81,933	37,512
Net cash provided by operating activities	785,882	811,286	849,541
Cash flows from investing activities:
Proceeds from maturity of marketable securities	1,233,866	1,110,176	991,578
Proceeds from sale of marketable securities	75,910	21,716	242,074
Proceeds from short-term bank deposits		248,571
Investment in marketable securities	(1,535,800)	(1,916,832)	(1,589,115)
Investment in short-term bank deposits	(7,343)		(10,602)
Purchase of property and equipment	(12,736)	(9,563)	(8,195)
Net cash used in investing activities	(246,103)	(545,932)	(374,260)
Cash flows from financing activities:
Proceeds from issuance of treasury shares upon exercise of options and vesting of restricted stock units	70,266	67,127	61,011
Purchase of treasury shares at cost	(768,176)	(534,196)	(466,164)
Excess tax benefit from stock-based compensation	11,669	35,345	11,128
Net cash used in financing activities	(686,241)	(431,724)	(394,025)
Increase (decrease) in cash and cash equivalents	(146,462)	(166,370)	81,256
Cash and cash equivalents at the beginning of the year	408,432	574,802	493,546
Cash and cash equivalents at the end of the year	261,970	408,432	574,802
Supplemental disclosure of cash flow information:
Cash paid during the year for taxes on income	239,245us-gaap_IncomeTaxesPaidNet	173,234us-gaap_IncomeTaxesPaidNet	85,897us-gaap_IncomeTaxesPaidNet
Supplemental disclosure of non-cash financing activities:
Accrued liability with respect to treasury shares		$ 3,633us-gaap_LiabilitiesAssumed1

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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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The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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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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The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

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

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The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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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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