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Business Combinations and Dispositions - Disposition of The Forum (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 05, 2018
Jun. 30, 2020
Mar. 24, 2020
Membership Interest Purchase Agreement      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Cash consideration for sale of business     $ 400,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Forum      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gain on sale   $ 240,783  
Transaction cost   50,806  
Consulting service fee   48,742  
Discontinued Operations, Disposed of by Sale | Azoff Music      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Remaining interest sold (as a percent) 50.00%    
Disposal Group, Held-for-sale, Not Discontinued Operations | Forum      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gain on sale attributable to settlement of related litigation   $ 140,495