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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Numerator: Basic |  |  |  |
Net earnings | $ 159,772 | $ 171,577 | $ 419,548 | $ 540,270
Net earnings attributable to noncontrolling interests | (31,228) | (25,803) | (88,842) | (105,061)
Net earnings attributable to IAC shareholders | 128,544 | 145,774 | 330,706 | 435,209
Numerator: Diluted |  |  |  |
Net earnings | 159,772 | 171,577 | 419,548 | 540,270
Net earnings attributable to noncontrolling interests | (31,228) | (25,803) | (88,842) | (105,061)
Impact from publicly-traded subsidiaries' dilutive securities | (7,342) | (8,336) | (20,174) | (19,490)
Net earnings attributable to IAC shareholders | $ 121,202 | $ 137,438 | $ 310,532 | $ 415,719
Denominator: Basic |  |  |  |
Weighted average basic shares outstanding (shares) | 84,393 | 83,433 | 84,147 | 83,342
Denominator: Diluted |  |  |  |
Weighted average basic shares outstanding (shares) | 84,393 | 83,433 | 84,147 | 83,342
Dilutive securities (shares) | 5,095 | 8,542 | 5,799 | 8,076
Denominator for earnings per share - weighted average shares (shares) | 89,488 | 91,975 | 89,946 | 91,418
Earnings per share attributable to IAC shareholders: Basic |  |  |  |
Earnings per share (USD per share) | $ 1.52 | $ 1.75 | $ 3.93 | $ 5.22
Earnings per share attributable to IAC shareholders: Diluted |  |  |  |
Earnings per share (USD per share) | 1.35 | 1.49 | 3.45 | 4.55
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Average share price (USD per share) | $ 238.90 | $ 181.60 | $ 223.32 | $ 160.85
Stock options, warrants, and subsidiary denominated equity exchange of Exchangeable Notes and vesting of RSUs |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Potentially dilutive securities excluded from calculation of diluted earnings per share (less than or equal to) (shares) | 7,700 | 3,400 | 11,200 | 3,400
Market-based awards and PSUs |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Potentially dilutive securities excluded from calculation of diluted earnings per share (less than or equal to) (shares) | 300 | 200 | 300 | 200
Senior Notes | 2022 Exchangeable Notes |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Potentially dilutive securities excluded from calculation of diluted earnings per share (less than or equal to) (shares) | 1,200 | 600 | 1,100 | 200
Exchange price per share (USD per share) |  |  | $ 152.18 |
Senior Notes | 2026 Exchangeable Notes |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Exchange price per share (USD per share) |  |  | 302.77 |
Senior Notes | 2030 Exchangeable Notes |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Exchange price per share (USD per share) |  |  | $ 291.35 |

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