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Restructuring Charges - By segment (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
Expected restructuring charges  
Three months ended March 31, 2020 $ 1,728
Corporate  
Expected restructuring charges  
Three months ended March 31, 2020 625
Contract Operations | Operating Segments  
Expected restructuring charges  
Three months ended March 31, 2020 478
Aftermarket Services | Operating Segments  
Expected restructuring charges  
Three months ended March 31, 2020 $ 625