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Restructuring and Other Charges - Segments (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restructuring and Other Charges              
Restructuring and other charges $ 141 $ 422 $ 366 $ 457 $ 0 $ 1,386 $ 16,901
Cost Reduction Plan              
Restructuring and Other Charges              
Restructuring and other charges           $ 0 13,328
Cost Reduction Plan | Operating | Contract Operations              
Restructuring and Other Charges              
Restructuring and other charges             3,424
Cost Reduction Plan | Operating | Aftermarket Services              
Restructuring and Other Charges              
Restructuring and other charges             1,113
Cost Reduction Plan | Other              
Restructuring and Other Charges              
Restructuring and other charges             $ 8,791