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Reportable Segments - Revenue and Gross Margin by Reportable Segment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Revenue and other financial information by reportable segment        
Revenue from external customers $ 197,982 $ 204,145 $ 387,867 $ 417,440
Loss before income taxes 96,130 110,926 188,186 225,680
Contract Operations        
Revenue and other financial information by reportable segment        
Revenue from external customers 151,114 162,973 301,098 339,212
Loss before income taxes 88,871 104,107 174,758 212,167
Aftermarket Services        
Revenue and other financial information by reportable segment        
Revenue from external customers 46,868 41,172 86,769 78,228
Loss before income taxes $ 7,259 $ 6,819 $ 13,428 $ 13,513