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Note 2 - Acquisitions & Divestitures - Schedule of Business Acquisition Assets and Liabilities of Valley Forge Convention Center Partners (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Sep. 17, 2018
Goodwill $ 1,102,977 $ 1,062,102  
Valley Forge Convention Center Partners, L.P. [Member]      
Current assets 29,280    
Property and equipment 57,118    
Other assets 2,872    
Intangible assets 136,600    
Total acquired assets 225,870    
Current liabilities 12,968    
Other liabilities 9,803    
Total liabilities assumed 22,771    
Net identifiable assets acquired 203,099    
Goodwill 85,966    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total 289,065   $ 289,100
Previously Reported [Member] | Valley Forge Convention Center Partners, L.P. [Member]      
Current assets   29,909  
Property and equipment   56,500  
Other assets   483  
Intangible assets   148,600  
Total acquired assets   235,492  
Current liabilities   12,968  
Other liabilities   606  
Total liabilities assumed   13,574  
Net identifiable assets acquired   221,918  
Goodwill   69,446  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total   $ 291,364  
Restatement Adjustment [Member] | Valley Forge Convention Center Partners, L.P. [Member]      
Current assets (629)    
Property and equipment 618    
Other assets 2,389    
Intangible assets (12,000)    
Total acquired assets (9,622)    
Current liabilities 0    
Other liabilities 9,197    
Total liabilities assumed 9,197    
Net identifiable assets acquired (18,819)    
Goodwill 16,520    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total $ (2,299)