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Restructuring Charges - Changes to Restructuring Liability by Major Restructuring Activity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Restructuring Cost And Reserve [Line Items]    
Beginning balance $ 2,251  
Restructuring charges 688 $ 162
Cash payments (714)  
Adjustment to liability 16  
Ending balance 2,241  
GES | Severance & Employee Benefits    
Restructuring Cost And Reserve [Line Items]    
Beginning balance 2,039  
Restructuring charges 426  
Cash payments (594)  
Adjustment to liability (41)  
Ending balance 1,830  
GES | Facilities    
Restructuring Cost And Reserve [Line Items]    
Beginning balance 200  
Restructuring charges 219  
Cash payments (62)  
Adjustment to liability 51  
Ending balance 408  
Other Restructuring | Severance & Employee Benefits    
Restructuring Cost And Reserve [Line Items]    
Beginning balance 12  
Restructuring charges 43  
Cash payments (58)  
Adjustment to liability 6  
Ending balance $ 3