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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Narrative (Details)
12 Months Ended
Oct. 23, 2017
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2019
USD ($)
Feb. 15, 2019
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Contractual maturity of current available-for-sale debt securities   1 year        
Available-for-sale marketable debt securities in a continuous unrealized loss position for longer than twelve months   $ 0        
Gross realized gains (losses) from available-for-sale securities   0 $ 0 $ 0    
Upward adjustments to equity securities without readily determinable fair value   19,900,000        
Downward adjustments to equity securities without readily determinable fair value   7,000,000.0        
Other-than-temporary impairment charges on equity method investments     600,000 2,700,000    
Other-than-temporary impairment charges on cost-method investments       $ 9,500,000    
Proceeds from sale of cost-method investment $ 60,200,000          
Gain (loss) from sale of cost-method investment $ 9,100,000          
Maximum contingent payment   45,000,000.0        
Gross fair value of contingent consideration arrangement   12,500,000        
Non-current portion of contingent consideration arrangement liability   6,900,000 26,600,000      
Current portion of contingent consideration arrangement liability     2,000,000.0      
Face amount of debt instrument     500,000,000      
Turo            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Equity method investments         $ 250,000,000  
Pinterest            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Realized gain (loss) on disposal of equity method investments   20,500,000        
Contingent Consideration Arrangements            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Settlements   1,988,000 948,000      
Match Group            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Aggregate principal amount   1,625,000,000 1,535,000,000      
Match Group | Match Group Senior Notes, 5.625% February 15, 2029 | Senior Notes            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Aggregate principal amount   $ 350,000,000 $ 0     $ 350,000,000
Stated interest rate (as a percent)   5.625% 5.625%     5.625%
Discount Rate | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Measurement input (as a percent)   0.125 0.125      
Discount Rate | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Measurement input (as a percent)     0.15      
Discount Rate | Contingent Consideration Arrangements | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Measurement input (as a percent)   0.25 0.12      
Discount Rate | Contingent Consideration Arrangements | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Measurement input (as a percent)     0.25