CONSOLIDATED STATEMENT OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Revenue	$ 1,636,815	$ 1,346,695	$ 1,410,078
Costs and expenses:
Cost of revenue (exclusive of depreciation shown separately below)	593,816	429,849	456,950
Selling and marketing expense	492,206	463,439	444,571
General and administrative expense	316,500	282,393	346,623
Product development expense	65,097	57,843	63,817
Depreciation	63,897	61,391	67,716
Amortization of intangibles	27,472	157,031	43,053
Amortization of non-cash marketing		15,868	20,002
Goodwill impairment	28,032	916,868	11,600
Total costs and expenses	1,587,020	2,384,682	1,454,332
Operating income (loss)	49,795	(1,037,987)	(44,254)
Other income (expense):
Interest income	6,517	10,218	24,750
Interest expense	(5,404)	(5,823)	(32,363)
Equity in (losses) income of unconsolidated affiliates	(25,676)	(14,014)	16,640
Gain on sales of long-term investments	3,989	28,835	381,099
Other (expense) income, net	(6,535)	71,772	(234,632)
Total other (expense) income, net	(27,109)	90,988	155,494
Earnings (loss) from continuing operations before income taxes	22,686	(946,999)	111,240
Income tax (provision) benefit	(32,079)	(9,474)	30,695
(Loss) earnings from continuing operations	(9,393)	(956,473)	141,935
Gain on Liberty Exchange	140,768
Gain on sale of discontinued operations, net of tax			23,314
Loss from discontinued operations, net of tax	(37,023)	(23,439)	(329,410)
Net earnings (loss)	94,352	(979,912)	(164,161)
Net loss attributable to noncontrolling interests	5,007	1,090	7,960
Net earnings (loss) attributable to IAC shareholders	99,359	(978,822)	(156,201)
Per share information attributable to IAC shareholders:
Basic (loss) earnings per share from continuing operations (in dollars per share)	$ (0.04)	$ (6.89)	$ 1.07
Diluted (loss) earnings per share from continuing operations (in dollars per share)	$ (0.04)	$ (6.89)	$ 1.04
Basic earnings (loss) per share (in dollars per share)	$ 0.93	$ (7.06)	$ (1.12)
Diluted earnings (loss) per share (in dollars per share)	$ 0.93	$ (7.06)	$ (1.08)
Non-cash compensation expense by function:
Total non-cash compensation expense	84,280	70,081	85,773
Cost of revenue
Non-cash compensation expense by function:
Total non-cash compensation expense	4,510	3,137	3,831
Selling and marketing expense
Non-cash compensation expense by function:
Total non-cash compensation expense	4,228	3,191	4,432
General and administrative expense
Non-cash compensation expense by function:
Total non-cash compensation expense	69,082	58,905	70,943
Product development expense
Non-cash compensation expense by function:
Total non-cash compensation expense	$ 6,460	$ 4,848	$ 6,567