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Segments - Revenue and Gross Margin by Reportable Segment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenue and other financial information by reportable segment    
Revenues $ 195,431 $ 249,697
Gross margin 108,283 136,055
Contract Operations    
Revenue and other financial information by reportable segment    
Revenues 166,034 206,974
Gross margin 104,669 128,323
Aftermarket Services    
Revenue and other financial information by reportable segment    
Revenues 29,397 42,723
Gross margin $ 3,614 $ 7,732