FAIR VALUE MEASUREMENTS (Details 2) (USD $)				3 Months Ended			3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Jan. 20, 2011 OkCupid	Mar. 31, 2012 Auction rate securities	Mar. 31, 2011 Auction rate securities security	Dec. 31, 2011 Auction rate securities	Mar. 31, 2012 Contingent Consideration Arrangement	Mar. 31, 2011 Contingent Consideration Arrangement
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				$ 5,870,000	$ 13,100,000
Total net gains (realized and unrealized) included in other comprehensive income, assets				1,850,000	950,000
Settlements, assets					(5,000,000)
Balance at the end of the period, assets				7,720,000	9,050,000
Changes in liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Balance at the beginning of the period, liabilities							(10,000,000)	0
Fair value at date of acquisition, liabilities								(40,000,000)
Settlements, liabilities							10,000,000
Balance at the end of the period, liabilities							0	(40,000,000)
Auction rate securities
Number of auction rate securities redeemed					1
Cost basis				10,000,000
Gross unrealized losses	86,000	37,000		2,300,000		4,100,000
Acquisition information
Potential additional payment to the former owner			$ 40,000,000