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MARKETABLE SECURITIES (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Continuous unrealized loss position
Fair Value	$ 19,035		$ 19,035		$ 73,723
Gross Unrealized Losses	(51)		(51)		(246)
Proceeds from sales and maturities of available-for-sale marketable securities and related gross realized gains and losses
Proceeds from sales and maturities of available-for-sale marketable securities	215,139	170,878	413,904	371,868
Gross realized gains	1,022	83	1,916	4,332
Gross realized losses		(7)	(18)	(7)
Corporate debt securities
Continuous unrealized loss position
Fair Value	12,271		12,271		34,552
Gross Unrealized Losses	(9)		(9)		(16)
States of the U.S. and state political subdivisions
Continuous unrealized loss position
Fair Value	6,764		6,764		39,171
Gross Unrealized Losses	$ (42)		$ (42)		$ (230)

This item represents the excess of amortized cost basis over fair value of securities that have been in a loss position for less than twelve months for those securities which are categorized neither as held-to-maturity nor trading securities.

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- Definition

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

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