Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION (Summary of stock-based compensation expense) (Details)

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STOCK-BASED COMPENSATION (Summary of stock-based compensation expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Total stock-based compensation expense $ 48,785 $ 45,582 $ 42,755
Total unrecognized compensation cost $ 88,900    
Amortization period of unrecognized compensation cost 2 years 7 months 6 days    
Ticketmaster Plan [Member]      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Expiration period 10 years    
Selling, General and Administrative Expense [Member]      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Total stock-based compensation expense $ 21,947 18,621 24,364
Corporate expenses [Member]      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Total stock-based compensation expense $ 26,838 $ 26,961 $ 18,391