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