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Restructuring Charges - By segment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Restructuring charges          
Restructuring charges $ 743 $ 2,408   $ 1,640 $ 4,136
Severance costs          
Restructuring charges          
Restructuring charges 605 2,408   1,493 4,136
Organizational Restructuring          
Restructuring charges          
Restructuring charges         1,728
Estimated additional charges 0     0  
Organizational Restructuring | Severance costs          
Restructuring charges          
Restructuring charges     $ 1,700   1,728
Pandemic Restructuring          
Restructuring charges          
Restructuring charges 605 2,408   1,493 2,408
Pandemic Restructuring | Severance costs          
Restructuring charges          
Restructuring charges 605 2,408   1,493 2,408
Restructuring charges incurred to date 6,800     6,800  
Property Restructuring          
Restructuring charges          
Restructuring charges 7     16  
Restructuring charges incurred to date 1,500     1,500  
Property Restructuring | Impairment          
Restructuring charges          
Restructuring charges       9  
Other Restructuring          
Restructuring charges          
Restructuring charges 131     131  
Corporate          
Restructuring charges          
Restructuring charges 285     879 1,361
Corporate | Organizational Restructuring          
Restructuring charges          
Restructuring charges         625
Corporate | Pandemic Restructuring          
Restructuring charges          
Restructuring charges 147 736   732 736
Corporate | Property Restructuring          
Restructuring charges          
Restructuring charges 7     16  
Corporate | Other Restructuring          
Restructuring charges          
Restructuring charges 131     131  
Contract Operations | Operating          
Restructuring charges          
Restructuring charges 337     616 1,864
Contract Operations | Operating | Organizational Restructuring          
Restructuring charges          
Restructuring charges         478
Contract Operations | Operating | Pandemic Restructuring          
Restructuring charges          
Restructuring charges 337 1,386   616 1,386
Aftermarket Services | Operating          
Restructuring charges          
Restructuring charges 121     145 911
Aftermarket Services | Operating | Organizational Restructuring          
Restructuring charges          
Restructuring charges         625
Aftermarket Services | Operating | Pandemic Restructuring          
Restructuring charges          
Restructuring charges $ 121 $ 286   $ 145 $ 286