FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Details 1) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Auction rate security
Gross Unrealized Losses			$ 0		$ 0
Contingent Consideration Arrangement
Increase in contingent consideration	632,000		6,339,000	0
Assets measured at fair value on a nonrecurring basis
Cost-method investments	119,200,000		119,200,000		113,800,000
Twoo
Contingent Consideration Arrangement
Fair Value of continegent consideration discount rate for risk	15.00%		15.00%
Contingent consideration, current	3,900,000		3,900,000
Contingent consideration, noncurrent	45,000,000		45,000,000
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	8,760,000	6,730,000	8,100,000	5,870,000	5,870,000
Total net gains (losses) (unrealized) included in other comprehensive income (loss), assets	540,000	600,000	1,200,000	1,460,000
Balance at the end of the period, assets	9,300,000	7,330,000	9,300,000	7,330,000	8,100,000
Auction rate security
Cost basis	10,000,000		10,000,000
Gross Unrealized Losses			700,000		1,900,000
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	(46,912,000)		0	(10,000,000)	(10,000,000)
Total net gains (losses) (unrealized) included in earnings, liabilities	(632,000)		(6,339,000)
Total net gains (losses) (unrealized) included in other comprehensive income (loss), liabilities	(1,387,000)		(1,755,000)
Fair value at date of acquisition, liabilities			(40,837,000)
Settlements, liabilities				10,000,000
Balance at the end of the period, liabilities	$ (48,931,000)	$ 0	$ (48,931,000)	$ 0