LONG-LIVED ASSETS (Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Gross Goodwill - Beginning of period	$ 2,433,861	$ 2,258,306
Accumulated impairment losses	(435,363)	(435,363)
Net Goodwill - Beginning of period	1,998,498	1,822,943
Acquisitions—current year	89,435	163,793
Acquisitions—prior year	16,198	8,428
Foreign exchange	25,072	3,334
Gross Goodwill - End of period	2,564,566	2,433,861
Accumulated impairment losses	(435,363)	(435,363)
Net Goodwill - End of period	2,129,203	1,998,498
Concerts [Member]
Goodwill [Roll Forward]
Gross Goodwill - Beginning of period	1,226,057	1,094,604
Accumulated impairment losses	(435,363)	(435,363)
Net Goodwill - Beginning of period	790,694	659,241
Acquisitions—current year	66,810	121,355
Acquisitions—prior year	9,033	8,428
Foreign exchange	16,373	1,670
Gross Goodwill - End of period	1,318,273	1,226,057
Accumulated impairment losses	(435,363)	(435,363)
Net Goodwill - End of period	882,910	790,694
Ticketing [Member]
Goodwill [Roll Forward]
Gross Goodwill - Beginning of period	766,263	762,953
Accumulated impairment losses	0	0
Net Goodwill - Beginning of period	766,263	762,953
Acquisitions—current year	8,778	4,017
Acquisitions—prior year	0	0
Foreign exchange	7,518	(707)
Gross Goodwill - End of period	782,559	766,263
Accumulated impairment losses	0	0
Net Goodwill - End of period	782,559	766,263
Sponsorship and Advertising [Member]
Goodwill [Roll Forward]
Gross Goodwill - Beginning of period	441,541	400,749
Accumulated impairment losses	0	0
Net Goodwill - Beginning of period	441,541	400,749
Acquisitions—current year	13,847	38,421
Acquisitions—prior year	7,165	0
Foreign exchange	1,181	2,371
Gross Goodwill - End of period	463,734	441,541
Accumulated impairment losses	0	0
Net Goodwill - End of period	$ 463,734	$ 441,541