FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Details 1) In Thousands, unless otherwise specified	6 Months Ended	9 Months Ended		12 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended	3 Months Ended		9 Months Ended			12 Months Ended
	Jun. 30, 2014 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Dec. 31, 2013 USD ($)	Sep. 30, 2014 Twoo [Member] USD ($)	Sep. 30, 2014 Twoo [Member] EUR (€)	Sep. 30, 2014 Auction rate security USD ($)	Sep. 30, 2013 Auction rate security USD ($)	Sep. 30, 2014 Auction rate security USD ($)	Sep. 30, 2013 Auction rate security USD ($)	Dec. 31, 2013 Auction rate security USD ($)	Sep. 30, 2014 Contingent Consideration Arrangement USD ($)	Sep. 30, 2013 Contingent Consideration Arrangement USD ($)	Sep. 30, 2014 Contingent Consideration Arrangement USD ($)	Sep. 30, 2013 Contingent Consideration Arrangement USD ($)	Sep. 30, 2014 Equity securities USD ($)	Dec. 31, 2013 Equity securities USD ($)
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							$ 9,250	$ 8,760	$ 8,920	$ 8,100	$ 8,100
Total net gains (losses) included in other comprehensive income (loss), Asset							(670)	540	(340)	1,200
Balance at the end of the period, assets							8,580	9,300	8,580	9,300	8,920
Changes in liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Balance at the beginning of the period												(41,397)	(49,182)	(45,828)	(1,909)
Total net gains (losses) included in earnings (unrealized), Liability												14,281	(632)	13,781	(6,339)
Total net gains (losses) included in other comprehensive income (loss), Liability												1,918	(1,387)	2,054	(1,755)
Fair value at date of acquisition														(2,835)	(41,387)
Settlements												29	13	7,659	202
Balance at the end of the period												(25,169)	(51,188)	(25,169)	(51,188)
Auction rate securities
Cost basis		117,033					10,000		10,000		10,000
Gross unrealized losses		110		0					1,400		1,100
Acquisition information
Business Acquisition Contingent Consideration Maximum Amount At Balance Sheet date		152,900
Business Acquisition Contingent Consideration Fair Value at Balance Sheet Date With A Maximum Limit		23,800
Business Acquisition Contingent Consideration Fair value at Balance Sheet Date Without a Limit		1,400
Acquisition-related contingent consideration payment		7,373	0
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High					99,900	77,900
Fair Value of contingent consideration discount rate for risk					15.00%	15.00%
Business Acquisition, Contingent Consideration, at Fair Value, Current		11,500
Business Acquisition, Contingent Consideration, at Fair Value, Noncurrent		13,700
Assets measured at fair value on a nonrecurring basis
Cost Method Investments		88,400		137,300
Cost-method Investments, Other than Temporary Impairment	64,200
Equity Method Investment, Other than Temporary Impairment	4,200
Long-term marketable equity security
Cost Basis																8,700	8,800
Gross Unrealized Gains		$ 2,028		$ 4,784												$ 1,600	$ 3,000