Annual report pursuant to Section 13 and 15(d)

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

v3.20.4
STOCK-BASED COMPENSATION (Summary of stock-based compensation expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Total stock-based compensation expense $ 116,889 $ 48,785 $ 45,582
Total unrecognized compensation cost $ 84,300    
Amortization period of unrecognized compensation cost 1 year 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 $ 88,620 21,947 18,621
Corporate expenses [Member]      
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]      
Total stock-based compensation expense $ 28,269 $ 26,838 $ 26,961