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STOCK-BASED COMPENSATION - NARRATIVE (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
Sep. 29, 2017
shares
Dec. 31, 2017
USD ($)
plan
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Sep. 30, 2017
shares
Share-based Compensation Arrangement by Share-based Payment Award                
Number of active stock-based compensation plans | plan         1      
Shares available for grant (in shares) | shares 25,800,000 25,800,000     25,800,000      
Unrecognized compensation cost, net of estimated forfeitures | $ $ 188,400 $ 188,400     $ 188,400      
Weighted average period over which cost is expected to be recognized (in years)         2 years 4 months 24 days      
Tax benefit recognized related to stock-based compensation | $         $ 71,100 $ 3,400 $ 3,000  
Intrinsic value of stock options exercised | $         100,700 21,700 200  
Incremental compensation cost | $     $ 6,600   217,700      
Incremental compensation cost from modification recognized in year of modification | $         93,400      
Cash received from stock option exercises | $         $ 1,653 0 0  
Aggregate number of shares required to settle equity awards at current estimated fair values held by subsidiary management | shares         16,400,000      
Cash remitted in withholding taxes on behalf of employees | $ $ 171,300              
Assumed witholding rate         50.00%      
2017 Plan                
Share-based Compensation Arrangement by Share-based Payment Award                
Stated term         10 years      
Stock Options                
Share-based Compensation Arrangement by Share-based Payment Award                
Vesting period         4 years      
Tax benefit realized from stock option exercises | $         $ 47,300 $ 8,800 $ 200  
Stock options granted in period (shares) | shares   948,000     900,000      
Weighted average grant date fair value of stock options granted (in usd per share) | $ / shares $ 4.30 $ 4.30     $ 4.30      
Cash received from stock option exercises | $         $ 1,700      
Stock options outstanding (shares) | shares 47,115,000 47,115,000     47,115,000      
RSUs                
Share-based Compensation Arrangement by Share-based Payment Award                
Vesting period         3 years      
Weighted average grant date fair value of RSUs (USD per share) | $ / shares         $ 12.58      
Fair value of RSU's that vested during the period | $         $ 19,200      
Equity units granted (shares) | shares         489,000      
Stock Appreciation Rights (SARs)                
Share-based Compensation Arrangement by Share-based Payment Award                
Stock options granted in period (shares) | shares       4,720,000 4,700,000 2,100,000 2,400,000  
Weighted average grant date fair value of stock options granted (in usd per share) | $ / shares $ 8.24 $ 8.24     $ 8.24 $ 3.13 $ 1.34  
Stock options outstanding (shares) | shares           13,830,000   11,781,000
IAC Denominated Stock Options                
Share-based Compensation Arrangement by Share-based Payment Award                
Vesting period         4 years      
Stock options granted (in shares) | shares         0 100,000 100,000  
Stock options outstanding (shares) | shares 200,000 200,000     200,000      
Expiration period         10 years      
PSUs                
Share-based Compensation Arrangement by Share-based Payment Award                
Equity units granted (shares) | shares         100,000 0 0