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Acquisitions (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 27, 2016
Jan. 27, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]          
Payments for acquisition, net of cash acquired     $ 0 $ 7,863 $ 0
International Polymerics, Inc          
Business Acquisition [Line Items]          
Percent of membership interests acquired 100.00%        
Payments for acquisition, net of cash acquired $ 7,900        
Common stock, shares issued (in shares) 247,764        
Artificial Lift          
Business Acquisition [Line Items]          
Common stock, shares issued (in shares)   60,024      
Percent of assets acquired   100.00%      
Consideration transferred, cash payments   $ 1,300