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Restructuring (Recoveries) Charges - Changes to Restructuring Liability by Major Restructuring Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Restructuring Cost And Reserve [Line Items]        
Beginning balance     $ 3,012  
Restructuring (recoveries) charges $ 383 $ 480 (326) [1] $ 1,125
Cash payments     (1,100)  
Adjustment to liability     37  
Ending balance 1,623   1,623  
GES | Severance & Employee Benefits        
Restructuring Cost And Reserve [Line Items]        
Beginning balance     1,634  
Restructuring (recoveries) charges [1]     (670)  
Cash payments     (624)  
Adjustment to liability     0  
Ending balance 340   340  
GES | Facilities        
Restructuring Cost And Reserve [Line Items]        
Beginning balance     1,378  
Restructuring (recoveries) charges [1]     343  
Cash payments     (476)  
Adjustment to liability     38  
Ending balance 1,283   1,283  
Other Restructuring | Severance & Employee Benefits        
Restructuring Cost And Reserve [Line Items]        
Beginning balance     0  
Restructuring (recoveries) charges [1]     1  
Cash payments     0  
Adjustment to liability     (1)  
Ending balance $ 0   $ 0  
[1] During the second quarter of 2024, we reversed a prior year accrual of $1.5 million related to a certain multi-employer pension fund.