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Restructuring Charges - Changes to Restructuring Liability by Major Restructuring Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Restructuring Cost And Reserve [Line Items]        
Beginning balance     $ 5,230  
Restructuring charges $ 787 $ 260 3,613 $ 1,111
Cash payments     (3,069)  
Non-cash items [1]     (1,934)  
Adjustment to liability     (3)  
Ending balance 3,837   3,837  
GES | Severance & Employee Benefits        
Restructuring Cost And Reserve [Line Items]        
Beginning balance     2,440  
Restructuring charges     10  
Cash payments     (686)  
Adjustment to liability     (2)  
Ending balance 1,762   1,762  
GES | Facilities        
Restructuring Cost And Reserve [Line Items]        
Beginning balance     2,766  
Restructuring charges     3,560  
Cash payments     (2,323)  
Non-cash items [1]     (1,934)  
Adjustment to liability     (15)  
Ending balance 2,054   2,054  
Other Restructuring | Severance & Employee Benefits        
Restructuring Cost And Reserve [Line Items]        
Beginning balance     24  
Restructuring charges     43  
Cash payments     (60)  
Adjustment to liability     14  
Ending balance $ 21   $ 21  
[1]

Represents non-cash adjustments related to a write down of certain ROU assets as a result of vacating certain facilities prior to the lease term and the closure and liquidation of GES’ United Kingdom-based audio-visual services business.