MARKETABLE SECURITIES

12 Months Ended

Dec. 31, 2012

NOTE 3:- MARKETABLE SECURITIES

Marketable securities with contractual maturities of less than one year are as follows:


	December 31,
	2011									2012
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value		Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
Government and corporate debentures - fixed interest rate	$	504,749	$	3,534	$	(237	)	$	508,046	$	599,614	$	2,738	$	(20	)	$	602,332
Government-sponsored enterprises debentures		40,088		238		—			40,326		59,719		271		—			59,990
Government and corporate debentures - floating interest rate		95,086		129		(48	)		95,167		33,096		61		(1	)		33,156

	$	639,923	$	3,901	$	(285	)	$	643,539	$	692,429	$	3,070	$	(21	)	$	695,478

Marketable securities with contractual maturities of over one year through five years are as follows:


	December 31,
	2011									2012
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value		Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
Government and corporate debentures - fixed interest rate	$	1,103,254	$	14,854	$	(2,058	)	$	1,116,050	$	1,327,086	$	13,094	$	(731	)	$	1,339,449
Government-sponsored enterprises		295,235		2,061		(151	)		297,145		382,758		2,170		(39	)		384,889
Government and corporate debentures - floating interest rate		102,161		160		(1,729	)		100,592		64,694		304		(6	)		64,992
Auction rate securities		6,078		—		—			6,078		2,697		—		—			2,697

	$	1,506,728	$	17,075	$	(3,938	)	$	1,519,865	$	1,777,235	$	15,568	$	(776	)	$	1,792,027

Investments with continuous unrealized losses for less than 12 months and 12 months or greater and their related fair values were as follows:


	December 31, 2011
	Investments with continuous unrealized losses for less than 12 months					Investments with continuous unrealized losses for 12 months or greater					Total Investments with continuous unrealized losses
	Fair value		Unrealized losses			Fair value		Unrealized losses			Fair value		Unrealized losses
Government and corporate debentures - fixed interest rate	$	267,326	$	(2,225	)	$	27,490	$	(69	)	$	294,816	$	(2,294	)
Government-sponsored enterprises		131,540		(151	)		—		—			131,540		(151	)
Government and corporate debentures - floating interest rate		66,426		(1,634	)		14,741		(144	)		81,167		(1,778	)

	$	465,292	$	(4,010	)	$	42,231	$	(213	)	$	507,523	$	(4,223	)


	December 31, 2012
	Investments with continuous unrealized losses for less than 12 months					Investments with continuous unrealized losses for 12 months or greater					Total Investments with continuous unrealized losses
	Fair value		Unrealized losses			Fair value		Unrealized losses			Fair value		Unrealized losses
Government and corporate debentures - fixed interest rate	$	352,886	$	(747	)	$	6,046	$	(4	)	$	358,932	$	(751	)
Government-sponsored enterprises		39,883		(39	)		252		(0	)		40,135		(39	)
Government and corporate debentures - floating interest rate		6,213		(6	)		6,249		(1	)		12,462		(7	)

	$	398,982	$	(792	)	$	12,547	$	(5	)	$	411,529	$	(797	)

As of December 31, 2011 and 2012, interest receivable amounted to $ 16,352 and $ 16,622, respectively, and is included within other current assets in the balance sheets.

- Definition

Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets.

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