FAIR VALUE MEASUREMENTS (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
Auction rate security
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	$ 9,050	$ 13,420	$ 13,100	$ 12,635
Total net gains (losses) (realized and unrealized) included in other comprehensive income, assets	(370)	(2,165)	580	(1,380)
Settlements, assets			(5,000)
Balance at the end of the period, assets	8,680	11,255	8,680	11,255
Contingent Consideration Arrangement
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	40,000
Fair value at date of acquisition, liabilities			40,000
Settlements, liabilities	(30,000)		(30,000)
Balance at the end of the period, liabilities	$ 10,000		$ 10,000