Quarterly report pursuant to Section 13 or 15(d)

LONG-LIVED ASSETS (Definite-lived Intangibles) (Details)

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LONG-LIVED ASSETS (Definite-lived Intangibles) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Finite-lived Intangible Assets [Roll Forward]      
Weighted-average lives of definite-lived intangible assets 10 years    
Finite-Lived Intangible Assets, Gross $ 1,993,106   $ 1,939,194
Finite-Lived Intangible Assets, Accumulated Amortization (830,323)   (777,573)
Definite-lived intangible assets, net 1,162,783   1,161,621
Finite-Lived Intangible Assets Acquired 57,576    
Acquisitions and additions—prior year 1,115    
Foreign exchange 1,986    
Other (2) [1] (6,765)    
Net change 53,912    
Amortization (62,005) $ (57,475)  
Foreign exchange 2,926    
Other (2) [1] 6,329    
Definite Lived Intangible Assets Total accumulated amortization $ (52,750)    
Revenue-generating contracts [Member]      
Finite-lived Intangible Assets [Roll Forward]      
Weighted-average lives of definite-lived intangible assets 10 years    
Finite-Lived Intangible Assets, Gross $ 984,567   925,257
Finite-Lived Intangible Assets, Accumulated Amortization (363,096)   (336,625)
Definite-lived intangible assets, net 621,471   588,632
Finite-Lived Intangible Assets Acquired 57,447    
Acquisitions and additions—prior year (2,479)    
Foreign exchange 4,938    
Other (2) [1] (596)    
Net change 59,310    
Amortization (27,378)    
Foreign exchange 311    
Other (2) [1] 596    
Definite Lived Intangible Assets Total accumulated amortization (26,471)    
Client/vendor relationships [Member]      
Finite-lived Intangible Assets [Roll Forward]      
Finite-Lived Intangible Assets, Gross 583,378   583,436
Finite-Lived Intangible Assets, Accumulated Amortization (270,242)   (251,649)
Definite-lived intangible assets, net 313,136   331,787
Finite-Lived Intangible Assets Acquired 0    
Acquisitions and additions—prior year 3,894    
Foreign exchange (2,807)    
Other (2) [1] (1,145)    
Net change (58)    
Amortization (21,851)    
Foreign exchange 2,113    
Other (2) [1] 1,145    
Definite Lived Intangible Assets Total accumulated amortization (18,593)    
Venue Management & Leaseholds      
Finite-lived Intangible Assets [Roll Forward]      
Finite-Lived Intangible Assets, Gross 221,403   226,788
Finite-Lived Intangible Assets, Accumulated Amortization (80,877)   (79,218)
Definite-lived intangible assets, net 140,526   147,570
Finite-Lived Intangible Assets Acquired 0    
Acquisitions and additions—prior year (237)    
Foreign exchange (946)    
Other (2) [1] (4,202)    
Net change (5,385)    
Amortization (6,450)    
Foreign exchange 569    
Other (2) [1] 4,222    
Definite Lived Intangible Assets Total accumulated amortization (1,659)    
Trademarks and naming rights [Member]      
Finite-lived Intangible Assets [Roll Forward]      
Finite-Lived Intangible Assets, Gross 183,403   183,493
Finite-Lived Intangible Assets, Accumulated Amortization (108,230)   (104,036)
Definite-lived intangible assets, net 75,173   79,457
Finite-Lived Intangible Assets Acquired 0    
Acquisitions and additions—prior year (63)    
Foreign exchange 842    
Other (2) [1] (869)    
Net change (90)    
Amortization (4,520)    
Foreign exchange 279    
Other (2) [1] 47    
Definite Lived Intangible Assets Total accumulated amortization $ (4,194)    
Technology and Other intangible assets [Member]      
Finite-lived Intangible Assets [Roll Forward]      
Weighted-average lives of definite-lived intangible assets 3 years    
Finite-Lived Intangible Assets, Gross $ 20,355   20,220
Finite-Lived Intangible Assets, Accumulated Amortization (7,878)   (6,045)
Definite-lived intangible assets, net 12,477   14,175
Finite-Lived Intangible Assets Acquired 129    
Acquisitions and additions—prior year 0    
Foreign exchange (41)    
Other (2) 47    
Net change 135    
Amortization (1,806)    
Foreign exchange (346)    
Other (2) 319    
Definite Lived Intangible Assets Total accumulated amortization (1,833)    
Technology and Other intangible assets [Member]      
Finite-lived Intangible Assets [Roll Forward]      
Finite-Lived Intangible Assets, Gross [2] 20,355   20,220
Finite-Lived Intangible Assets, Accumulated Amortization [2] (7,878)   (6,045)
Definite-lived intangible assets, net [2] 12,477   $ 14,175
Finite-Lived Intangible Assets Acquired [2] 129    
Acquisitions and additions—prior year [2] 0    
Foreign exchange [2] (41)    
Other (2) [1],[2] 47    
Net change [2] 135    
Amortization [2] (1,806)    
Foreign exchange [2] (346)    
Other (2) [1],[2] 319    
Definite Lived Intangible Assets Total accumulated amortization [2] $ (1,833)    
[1] Other primarily includes netdowns of fully amortized or impaired assets.
[2] Other primarily includes intangible assets for non-compete agreements.