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Restructuring Charges - By segment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2021
Restructuring charges    
Restructuring charges $ 1,775 $ 2,903
Organizational Restructuring    
Restructuring charges    
Expected additional charges 400  
Restructuring charges 1,775  
Pandemic Restructuring    
Restructuring charges    
Restructuring charges   1,717
Property Restructuring    
Restructuring charges    
Restructuring charges   964
Other Restructuring    
Restructuring charges    
Restructuring charges   222
Corporate    
Restructuring charges    
Restructuring charges 1,287 1,213
Corporate | Organizational Restructuring    
Restructuring charges    
Restructuring charges 1,287  
Corporate | Pandemic Restructuring    
Restructuring charges    
Restructuring charges   956
Corporate | Property Restructuring    
Restructuring charges    
Restructuring charges   35
Corporate | Other Restructuring    
Restructuring charges    
Restructuring charges   222
Contract operations | Operating    
Restructuring charges    
Restructuring charges 101 1,545
Contract operations | Operating | Organizational Restructuring    
Restructuring charges    
Restructuring charges 101  
Contract operations | Operating | Pandemic Restructuring    
Restructuring charges    
Restructuring charges   616
Contract operations | Operating | Property Restructuring    
Restructuring charges    
Restructuring charges   929
Aftermarket services | Operating    
Restructuring charges    
Restructuring charges 387 145
Aftermarket services | Operating | Organizational Restructuring    
Restructuring charges    
Restructuring charges $ 387  
Aftermarket services | Operating | Pandemic Restructuring    
Restructuring charges    
Restructuring charges   $ 145