FAIR VALUE MEASUREMENTS (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011 Auction rate security	Sep. 30, 2010 Auction rate security	Sep. 30, 2011 Auction rate security	Sep. 30, 2010 Auction rate security	Sep. 30, 2011 Contingent Consideration Arrangement	Jun. 30, 2011 Contingent Consideration Arrangement
Changes in assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Balance at the beginning of the period, assets	$ 8,680	$ 11,255	$ 13,100	$ 12,635
Total net (losses) gains (realized and unrealized) included in other comprehensive income, assets	(2,820)	1,095	(2,240)	(285)
Settlements, assets			(5,000)
Balance at the end of the period, assets	5,860	12,350	5,860	12,350
Changes in liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Balance at the beginning of the period, liabilities						10,000
Fair value at date of acquisition, liabilities					40,000
Settlements, liabilities					(30,000)
Balance at the end of the period, liabilities					$ 10,000	$ 10,000