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FINANCIAL INSTRUMENTS - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Feb. 15, 2019
Dec. 31, 2018
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Unrealized gain (loss) on marketable equity security $ 29,800,000     $ 29,800,000      
Gross realized gains     $ 0 0 $ 0    
Gross realized losses 0   $ 0 0 $ 0    
Assets measured at fair value on a nonrecurring basis              
Equity securities without readily determinable fair values 102,000,000.0     102,000,000.0     $ 235,100,000
Marketable securities 161,749,000     161,749,000     123,665,000
Total upward adjustments to equity securities without readily determinable fair value 200,000     200,000      
Total downward adjustments to equity securities without readily determinable fair value (2,700,000)     (2,700,000)      
Contingent Consideration Arrangements              
Contingent consideration, maximum amount at balance sheet date 45,000,000.0     45,000,000.0      
Contingent consideration, fair value at balance sheet date with a maximum limit 44,000,000.0     44,000,000.0      
Payment for contingent consideration arrangement   $ 2,000,000.0          
Contingent consideration, at fair value, current 12,600,000     12,600,000     2,000,000.0
Contingent consideration, at fair value, noncurrent 17,200,000     17,200,000     26,600,000
Match Group              
Contingent Consideration Arrangements              
Long-term debt 1,625,000,000     1,625,000,000     1,535,000,000
Match Group | Credit Facility | MTCH Credit Facility due December 7, 2023              
Contingent Consideration Arrangements              
Face amount of debt instrument             500,000,000
Long-term debt 0     0     260,000,000
Match Group | Senior Notes | 5.625% MTCH Senior Notes              
Contingent Consideration Arrangements              
Long-term debt $ 350,000,000     $ 350,000,000     $ 0
Stated interest rate (as a percent) 5.625%     5.625%   5.625%  
Measurement Input, Discount Rate | Contingent Consideration Arrangements              
Contingent Consideration Arrangements              
Contingent consideration, discount rates (as a percent) 0.25     0.25      
Minimum | Measurement Input, Discount Rate | Contingent Consideration Arrangements              
Contingent Consideration Arrangements              
Contingent consideration, discount rates (as a percent)             0.12
Maximum | Measurement Input, Discount Rate | Contingent Consideration Arrangements              
Contingent Consideration Arrangements              
Contingent consideration, discount rates (as a percent)             0.25