FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS (Details 1)	3 Months Ended	12 Months Ended				3 Months Ended		12 Months Ended	3 Months Ended
	Mar. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Mar. 31, 2014 Twoo [Member]	Jan. 04, 2013 Twoo [Member] USD ($)	Jan. 04, 2013 Twoo [Member] EUR (€)	Mar. 31, 2014 Auction rate security USD ($)	Mar. 31, 2013 Auction rate security USD ($)	Dec. 31, 2013 Auction rate security USD ($)	Mar. 31, 2014 Contingent Consideration Arrangement USD ($)	Mar. 31, 2013 Contingent Consideration Arrangement USD ($)	Mar. 31, 2014 Carrying value USD ($)	Dec. 31, 2013 Carrying value USD ($)	Mar. 31, 2014 Fair value USD ($)	Dec. 31, 2013 Fair value USD ($)
Assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Long-term debt	$ (1,080,000,000)	$ (1,080,000,000)									$ (1,080,000,000)	$ (1,080,000,000)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings									27,000	(1,458,000)
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						8,920,000	8,100,000	8,100,000
Total net gains (losses) included in other comprehensive income (loss)						230,000	480,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)									(363,000)	0
Balance at the end of the period, assets						9,150,000	8,580,000	8,920,000
Changes in liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Balance at the beginning of the period									(45,828,000)	(1,909,000)
Fair value at date of acquisition									(2,835,000)	(41,387,000)
Settlements									241,000	177,000
Balance at the end of the period									(48,758,000)	(44,577,000)
Auction rate securities
Cost basis						10,000,000		0
Gross unrealized losses	18,000	0				900,000		1,100,000
Acquisition information
Business Acquisition Contingent Consideration Maximum Amount At Balance Sheet date	138,300,000
Business Acquisition Contingent Consideration Fair Value at Balance Sheet Date With A Maximum Limit	47,400,000
Business Acquisition Contingent Consideration Fair value at Balance Sheet Date Without a Limit	1,400,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High				114,800,000	83,200,000
Fair Value of contingent consideration discount rate for risk			15.00%
Business Acquisition, Contingent Consideration, at Fair Value, Current	8,000,000
Business Acquisition, Contingent Consideration, at Fair Value, Noncurrent	40,800,000
Long-term Debt, Fair Value													(1,096,897,000)	(1,058,396,000)
Assets measured at fair value on a nonrecurring basis
Cost Method Investments	$ 144,800,000	$ 137,300,000