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Segment Data - Reportable Segments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenue, Major Customer [Line Items]        
Revenues $ 235,329 $ 201,663 $ 698,884 $ 543,374
Operating Income (Loss) 10,054 9,882 43,035 21,596
Operating segments | Fluids systems        
Revenue, Major Customer [Line Items]        
Revenues 180,970 166,726 538,087 453,399
Operating Income (Loss) 8,288 7,930 32,092 20,145
Operating segments | Mats and integrated services        
Revenue, Major Customer [Line Items]        
Revenues 54,359 34,937 160,797 89,975
Operating Income (Loss) 12,925 10,941 39,864 28,762
Corporate, non-segment | Corporate office        
Revenue, Major Customer [Line Items]        
Operating Income (Loss) $ (11,159) $ (8,989) $ (28,921) $ (27,311)