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Restructuring Charges - Changes to Restructuring Liability by Major Restructuring Activity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Restructuring Cost And Reserve [Line Items]    
Beginning balance $ 4,513  
Restructuring charges 851 $ 688
Cash payments (1,293)  
Adjustment to liability (116)  
Ending balance 3,955  
GES | Severance & Employee Benefits    
Restructuring Cost And Reserve [Line Items]    
Beginning balance 2,935  
Restructuring charges 664  
Cash payments (808)  
Adjustment to liability (80)  
Ending balance 2,711  
GES | Facilities    
Restructuring Cost And Reserve [Line Items]    
Beginning balance 1,339  
Restructuring charges (8)  
Cash payments (223)  
Adjustment to liability (46)  
Ending balance 1,062  
Other Restructuring | Severance & Employee Benefits    
Restructuring Cost And Reserve [Line Items]    
Beginning balance 239  
Restructuring charges 195  
Cash payments (262)  
Adjustment to liability 10  
Ending balance $ 182