FINANCIAL INSTRUMENTS (Details) (USD $)	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2011 Newsweek Daily Beast Company	Jan. 31, 2011 Newsweek Daily Beast Company	Jun. 30, 2011 Carrying Value	Dec. 31, 2010 Carrying Value	Jun. 30, 2011 Carrying Value Marketable equity security	Jun. 30, 2011 Carrying Value Auction rate security	Dec. 31, 2010 Carrying Value Auction rate security	Jun. 30, 2011 Carrying Value Newsweek Daily Beast Company	Jun. 30, 2011 Total Fair Value Measurements	Dec. 31, 2010 Total Fair Value Measurements	Jun. 30, 2011 Total Fair Value Measurements Marketable equity security	Jun. 30, 2011 Total Fair Value Measurements Auction rate security	Dec. 31, 2010 Total Fair Value Measurements Auction rate security	Jun. 30, 2011 Total Fair Value Measurements Newsweek Daily Beast Company
Fair value of financial instruments
Cash and cash equivalents					$ 622,866,000	$ 742,099,000					$ 622,866,000	$ 742,099,000
Marketable securities	288,997,000	563,997,000			288,997,000	563,997,000					288,997,000	563,997,000
Funds held in escrow for Meetic tender offer	360,583,000				360,583,000						360,583,000
Long-term investments							80,961,000	8,680,000	13,100,000				80,961,000	8,680,000	13,100,000
Notes receivable					3,615,000	3,316,000					2,849,000	2,818,000
Contingent consideration arrangement					(10,000,000)						(10,000,000)
Long-term debt					(95,844,000)	(95,844,000)					(88,640,000)	(83,363,000)
Guarantee of The Newsweek/Daily Beast Company debt					(5,000,000)					(5,000,000)	(5,000,000)					(5,000,000)
Letters of credit and surety bond											(232,000)	(362,000)
Amount of maximum borrowing under line of credit				10,000,000
Amount drawn on the basis of line of credit facility			10,000,000
Long-term investments
Cost method investments, carrying value	6,900,000	39,000,000
Cost basis of long-term marketable equity security formerly accounted for under the cost method	33,400,000
Unrealized gain on investment recorded at fair value	$ 47,500,000