Annual report pursuant to Section 13 and 15(d)

FAIR VALUE MEASUREMENTS (Fair Value of Assets Measured on Non-recurring Basis) (Details)

v3.20.4
FAIR VALUE MEASUREMENTS (Fair Value of Assets Measured on Non-recurring Basis) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment charges related to definite-lived intangible assets $ 23,630 $ 26,751  
Goodwill impairment 0 0 $ 10,500
Revenue-generating contracts [Member] | Concerts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment charges related to definite-lived intangible assets   26,800  
Fair Value, Nonrecurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Definite-lived intangible assets 7,963 0  
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Definite-lived intangible assets 0 0  
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Definite-lived intangible assets 0 0  
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Definite-lived intangible assets $ 7,963 $ 0