EARNINGS PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Numerator: Basic
Earnings from continuing operations	$ 67,973	$ 22,440	$ 133,771	$ 23,264
Net loss (earnings) attributable to noncontrolling interests	922	(136)	54	1,239
Earnings from continuing operations attributable to IAC shareholders	68,895	22,304	133,825	24,503
Loss from discontinued operations, net of tax	(3,922)	(4,795)	(8,358)	(12,108)
Net earnings attributable to IAC shareholders	64,973	17,509	125,467	12,395
Numerator: Diluted
Earnings from continuing operations	67,973	22,440	133,771	23,264
Net loss (earnings) attributable to noncontrolling interests	922	(136)	54	1,239
Earnings from continuing operations attributable to IAC shareholders	68,895	22,304	133,825	24,503
Loss from discontinued operations, net of tax	(3,922)	(4,795)	(8,358)	(12,108)
Net earnings attributable to IAC shareholders	$ 64,973	$ 17,509	$ 125,467	$ 12,395
Denominator: Basic
Weighted average basic shares outstanding (in shares)	84,613	103,152	87,898	109,580
Denominator: Diluted
Weighted average basic shares outstanding (in shares)	84,613	103,152	87,898	109,580
Dilutive securities including stock options, warrants and RSUs (in shares)	9,129	3,076	6,992	3,288
Denominator for earnings per share-weighted average shares (in shares)	93,742	106,228	94,890	112,868
Earnings per share attributable to IAC shareholders: Basic
Earnings per share from continuing operations (in dollars per share)	$ 0.81	$ 0.22	$ 1.52	$ 0.22
Discontinued operations, net of tax (in dollars per share)	$ (0.04)	$ (0.05)	$ (0.09)	$ (0.11)
Earnings per share (in dollars per share)	$ 0.77	$ 0.17	$ 1.43	$ 0.11
Earnings per share attributable to IAC shareholders: Diluted
Earnings per share from continuing operations (in dollars per share)	$ 0.73	$ 0.21	$ 1.41	$ 0.22
Discontinued operations, net of tax (in dollars per share)	$ (0.04)	$ (0.05)	$ (0.09)	$ (0.11)
Earnings per share (in dollars per share)	$ 0.69	$ 0.16	$ 1.32	$ 0.11

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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