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Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2011

Marketable Securities [Abstract]

Schedule Of Marketable Securities With Contractual Maturities


		December 31,
		2010																2011
		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		$	313,939			$	2,372			$	(85	)		$	316,226			$	504,749			$	3,534			$	(237	)		$	508,046
Government-sponsored enterprises			142,496				504				(100	)			142,900				40,088				238				—				40,326
Government and corporate debentures - floating interest rate			78,505				97				(10	)			78,592				95,086				129				(48	)			95,167

		$	534,940			$	2,973			$	(195	)		$	537,718			$	639,923			$	3,901			$	(285	)		$	643,539


		December 31,
		2010																2011
		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		$	990,454			$	18,421			$	(1,731	)		$	1,007,144			$	1,103,254			$	14,854			$	(2,058	)		$	1,116,050
Government-sponsored enterprises			189,085				1,366				(552	)			189,899				295,235				2,061				(151	)			297,145
Government and corporate debentures - floating interest rate			120,206				297				(85	)			120,418				102,161				160				(1,729	)			100,592
Auction rate securities (*)			7,990				—				—				7,990				6,078				—				—				6,078

		$	1,307,735			$	20,084			$	(2,368	)		$	1,325,451			$	1,506,728			$	17,075			$	(3,938	)		$	1,519,865

Investments With Continuous Unrealized Losses


		December 31, 2010
		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		$	195,784			$	(1,816	)		$	—			$	—			$	195,784			$	(1,816	)
Government-sponsored enterprises			122,574				(649	)			4,999				(3	)			127,572				(652	)
Government and corporate debentures - floating interest rate			58,632				(47	)			15,834				(48	)			74,467				(95	)

		$	376,990			$	(2,512	)		$	20,833			$	(51	)		$	397,823			$	(2,563	)


		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	)