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Restructuring Charges - By segment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Restructuring charges    
Restructuring costs $ 2,408 $ 4,136
Corporate    
Restructuring charges    
Restructuring costs 736 1,361
Contract Operations | Operating Segments    
Restructuring charges    
Restructuring costs 1,386 1,864
Aftermarket Services | Operating Segments    
Restructuring charges    
Restructuring costs $ 286 $ 911