FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Details 1) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Auction rate security
Gross unrealized losses	$ 0		$ 0		$ 0
Contingent Consideration Arrangement
Increase in contingent consideration	(4,249,000)		(5,707,000)	0
Assets measured at fair value on a nonrecurring basis
Cost-method investments	118,600,000		118,600,000		113,800,000
Twoo
Contingent Consideration Arrangement
Fair Value of continegent consideration discount rate for risk	15.00%		15.00%
Increase in contingent consideration	4,200,000		5,700,000
Contingent consideration, current	3,900,000		3,900,000
Contingent consideration, noncurrent	43,000,000		43,000,000
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	8,580,000	7,720,000	8,100,000	5,870,000
Total net gains (losses) (unrealized) included in other comprehensive income (loss), assets	180,000	(990,000)	660,000	860,000
Balance at the end of the period, assets	8,760,000	6,730,000	8,760,000	6,730,000
Auction rate security
Cost basis	10,000,000		10,000,000
Gross unrealized losses	1,200,000		1,200,000		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	(42,295,000)		0	(10,000,000)
Total net gains (losses) (unrealized) included in earnings, liabilities	(4,249,000)		(5,707,000)
Total net gains (losses) (unrealized) included in other comprehensive income (loss), liabilities	(368,000)		(368,000)
Fair value at date of acquisition, liabilities			(40,837,000)
Settlements, liabilities				10,000,000
Balance at the end of the period, liabilities	$ (46,912,000)	$ 0	$ (46,912,000)	$ 0