SHAREHOLDERS' EQUITY	12 Months Ended
Dec. 31, 2018
Stockholders' Equity Note [Abstract]
SHAREHOLDERS' EQUITY	SHAREHOLDERS' EQUITY Description of Common Stock and Class B Convertible Common Stock Except as described herein, shares of IAC common stock and IAC Class B common stock are identical. Each holder of shares of IAC common stock and IAC Class B common stock vote together as a single class with respect to matters that may be submitted to a vote or for the consent of IAC's shareholders generally, including the election of directors. In connection with any such vote, each holder of IAC common stock is entitled to one vote for each share of IAC common stock held and each holder of IAC Class B common stock is entitled to ten votes for each share of IAC Class B common stock held. Notwithstanding the foregoing, the holders of shares of IAC common stock, acting as a single class, are entitled to elect 25% of the total number of IAC's directors, and, in the event that 25% of the total number of directors shall result in a fraction of a director, then the holders of shares of IAC common stock, acting as a single class, are entitled to elect the next higher whole number of IAC's directors. In addition, Delaware law requires that certain matters be approved by the holders of shares of IAC common stock or holders of IAC Class B common stock voting as a separate class. Shares of IAC Class B common stock are convertible into shares of IAC common stock at the option of the holder thereof, at any time, on a share-for-share basis. Such conversion ratio will in all events be equitably preserved in the event of any recapitalization of IAC by means of a stock dividend on, or a stock split or combination of, outstanding shares of IAC common stock or IAC Class B common stock, or in the event of any merger, consolidation or other reorganization of IAC with another corporation. Upon the conversion of shares of IAC Class B common stock into shares of IAC common stock, those shares of IAC Class B common stock will be retired and will not be subject to reissue. Shares of IAC common stock are not convertible into shares of IAC Class B common stock. The holders of shares of IAC common stock and the holders of shares of IAC Class B common stock are entitled to receive, share for share, such dividends as may be declared by IAC's Board of Directors out of funds legally available therefor. In the event of a liquidation, dissolution, distribution of assets or winding-up of IAC, the holders of shares of IAC common stock and the holders of shares of IAC Class B common stock are entitled to receive, share for share, all the assets of IAC available for distribution to its stockholders, after the rights of the holders of any IAC preferred stock have been satisfied. Reserved Common Shares In connection with equity compensation plans, the Exchangeable Notes and warrants, 28.0 million shares of IAC common stock are reserved at December 31, 2018. Warrants and Exchangeable Notes At December 31, 2018 and 2017, warrants to acquire initially (subject to adjustment upon the occurrence of specified events) 3.4 million shares of IAC common stock at $229.70 per share were outstanding. The warrants were issued in connection with the issuance of the Exchangeable Notes on October 2, 2017 for aggregate proceeds of $23.6 million. During the years ended December 31, 2018 and 2017, no warrants were exercised and no Exchangeable Notes were exchanged. See "Note 7—Long-term Debt" for additional information on the Exchangeable Notes. Common Stock Repurchases During the years ended December 31, 2018, 2017 and 2016, the Company repurchased 0.5 million, 0.7 million and 6.3 million shares of IAC common stock for aggregate consideration, on a trade date basis, of $82.9 million, $50.1 million and $315.3 million, respectively. On May 3, 2016, IAC's Board of Directors authorized the repurchase of an additional 10.0 million shares of IAC common stock. At December 31, 2018, the Company has approximately 8.0 million shares remaining in its share repurchase authorization.

SHAREHOLDERS' EQUITY

Description of Common Stock and Class B Convertible Common Stock

Except as described herein, shares of IAC common stock and IAC Class B common stock are identical.

Each holder of shares of IAC common stock and IAC Class B common stock vote together as a single class with respect to matters that may be submitted to a vote or for the consent of IAC's shareholders generally, including the election of directors. In connection with any such vote, each holder of IAC common stock is entitled to one vote for each share of IAC common stock held and each holder of IAC Class B common stock is entitled to ten votes for each share of IAC Class B common stock held. Notwithstanding the foregoing, the holders of shares of IAC common stock, acting as a single class, are entitled to elect 25% of the total number of IAC's directors, and, in the event that 25% of the total number of directors shall result in a fraction of a director, then the holders of shares of IAC common stock, acting as a single class, are entitled to elect the next higher whole number of IAC's directors. In addition, Delaware law requires that certain matters be approved by the holders of shares of IAC common stock or holders of IAC Class B common stock voting as a separate class.

Shares of IAC Class B common stock are convertible into shares of IAC common stock at the option of the holder thereof, at any time, on a share-for-share basis. Such conversion ratio will in all events be equitably preserved in the event of any recapitalization of IAC by means of a stock dividend on, or a stock split or combination of, outstanding shares of IAC common stock or IAC Class B common stock, or in the event of any merger, consolidation or other reorganization of IAC with another corporation. Upon the conversion of shares of IAC Class B common stock into shares of IAC common stock, those shares of IAC Class B common stock will be retired and will not be subject to reissue. Shares of IAC common stock are not convertible into shares of IAC Class B common stock.

The holders of shares of IAC common stock and the holders of shares of IAC Class B common stock are entitled to receive, share for share, such dividends as may be declared by IAC's Board of Directors out of funds legally available therefor. In the event of a liquidation, dissolution, distribution of assets or winding-up of IAC, the holders of shares of IAC common stock and the holders of shares of IAC Class B common stock are entitled to receive, share for share, all the assets of IAC available for distribution to its stockholders, after the rights of the holders of any IAC preferred stock have been satisfied.

Reserved Common Shares

In connection with equity compensation plans, the Exchangeable Notes and warrants, 28.0 million shares of IAC common stock are reserved at December 31, 2018.

Warrants and Exchangeable Notes

At December 31, 2018 and 2017, warrants to acquire initially (subject to adjustment upon the occurrence of specified events) 3.4 million shares of IAC common stock at $229.70 per share were outstanding. The warrants were issued in connection with the issuance of the Exchangeable Notes on October 2, 2017 for aggregate proceeds of $23.6 million. During the years ended December 31, 2018 and 2017, no warrants were exercised and no Exchangeable Notes were exchanged. See "Note 7—Long-term Debt" for additional information on the Exchangeable Notes.

Common Stock Repurchases

During the years ended December 31, 2018, 2017 and 2016, the Company repurchased 0.5 million, 0.7 million and 6.3 million shares of IAC common stock for aggregate consideration, on a trade date basis, of $82.9 million, $50.1 million and $315.3 million, respectively.

On May 3, 2016, IAC's Board of Directors authorized the repurchase of an additional 10.0 million shares of IAC common stock. At December 31, 2018, the Company has approximately 8.0 million shares remaining in its share repurchase authorization.