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Restructuring Charges - By segment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Restructuring charges    
Restructuring charges $ 2,903 $ 8,450
Organizational Restructuring    
Restructuring charges    
Restructuring charges   1,695
Pandemic Restructuring    
Restructuring charges    
Restructuring charges 1,717 5,257
2020 Property Restructuring    
Restructuring charges    
Loss on sale   915
Impairment loss   583
Restructuring charges 35 1,498
2021 Property Restructuring    
Restructuring charges    
Restructuring charges 929  
Other Restructuring    
Restructuring charges    
Restructuring charges 222  
Corporate    
Restructuring charges    
Restructuring charges 1,213 3,644
Corporate | Organizational Restructuring    
Restructuring charges    
Restructuring charges   612
Corporate | Pandemic Restructuring    
Restructuring charges    
Restructuring charges 956 1,534
Corporate | 2020 Property Restructuring    
Restructuring charges    
Loss on sale   915
Impairment loss   583
Restructuring charges 35 1,498
Corporate | Other Restructuring    
Restructuring charges    
Restructuring charges 222  
Contract Operations | Operating    
Restructuring charges    
Restructuring charges 1,545 2,963
Contract Operations | Operating | Organizational Restructuring    
Restructuring charges    
Restructuring charges   458
Contract Operations | Operating | Pandemic Restructuring    
Restructuring charges    
Restructuring charges 616 2,505
Contract Operations | Operating | 2021 Property Restructuring    
Restructuring charges    
Restructuring charges 929  
Aftermarket Services | Operating    
Restructuring charges    
Restructuring charges 145 1,843
Aftermarket Services | Operating | Organizational Restructuring    
Restructuring charges    
Restructuring charges   625
Aftermarket Services | Operating | Pandemic Restructuring    
Restructuring charges    
Restructuring charges $ 145 $ 1,218